2,5-Dihydro-3,6-Di-2-Thienyl-Pyrrolo[3,4-C]Pyrrole-1,4-Dione
Pyrrolidine Pyrrole Thiazole Imidazole Thiophene Pyrazine Piperidine Piperazine Morpholine Phenazine

2,5-Dihydro-3,6-Di-2-Thienyl-Pyrrolo[3,4-C]Pyrrole-1,4-Dione


    • Product Name 2,5-Dihydro-3,6-Di-2-Thienyl-Pyrrolo[3,4-C]Pyrrole-1,4-Dione
    • Alias DPP-Th
    • Einecs 681-190-1
    • Mininmum Order 1g
    • Factory Site West Ujimqin Banner, Xilingol League, Inner Mongolia, China
    • Price Inquiry sales9@bouling-chem.com
    • Manufacturer Bouling Chemical Co., Limited
    • CONTACT NOW
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    Specifications

    HS Code

    249077
    Chemical Formula C16H10N2O2S2
    Molar Mass 322.39 g/mol
    Appearance Solid (usually)
    Physical State At Room Temperature Solid
    Melting Point Specific value would require literature search
    Solubility In Common Solvents Limited solubility in water, solubility in organic solvents like dichloromethane, etc. (qualitative)
    Color Typically colored (exact color depends on purity and form, often some shade related to conjugated system)
    Crystal Structure Determined by X - ray crystallography (detailed structure in literature)
    Stability Stable under normal conditions, may be sensitive to light and air over long - term storage
    Pka Value Specific values for acidic or basic sites would need literature search

    As an accredited 2,5-Dihydro-3,6-Di-2-Thienyl-Pyrrolo[3,4-C]Pyrrole-1,4-Dione factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.

    Packing & Storage
    Packing 100g of 2,5 - Dihydro - 3,6 - Di - 2 - Thienyl - Pyrrolo[3,4 - c]Pyrrole - 1,4 - Dione in sealed vial.
    Shipping Shipment of 2,5 - Dihydro - 3,6 - Di - 2 - Thienyl - Pyrrolo[3,4 - c]Pyrrole - 1,4 - Dione is carefully packaged to prevent damage. It's shipped via approved carriers, following all chemical transport regulations to ensure safe and timely delivery.
    Storage Store 2,5 - Dihydro - 3,6 - Di - 2 - Thienyl - Pyrrolo[3,4 - c]Pyrrole - 1,4 - Dione in a cool, dry place away from direct sunlight. Keep it in a tightly sealed container to prevent moisture and air exposure, which could potentially degrade the chemical. Store it separately from incompatible substances to avoid chemical reactions.
    Application of 2,5-Dihydro-3,6-Di-2-Thienyl-Pyrrolo[3,4-C]Pyrrole-1,4-Dione
    In bottom-gate, top-contact organic thin-film transistors where p-channel operation must deliver hole mobilities exceeding 1.0 cm²/V·s for refresh rates suitable for e-paper backplanes, the thiophene-flanked diketopyrrolopyrrole chromophore is formulated as a donor–acceptor copolymer with carefully controlled regioregularity. The material is dissolved in anhydrous 1,2-dichlorobenzene at a solids loading of 5–8 mg/mL and heated to 80°C under dry nitrogen before being deposited by off-centre spin-coating or bar-assisted meniscus shearing onto octadecyltrichlorosilane-treated 300 nm SiO₂/Si substrates. During film formation, edge-on crystallite orientation is enforced by maintaining a substrate temperature of 60°C while the evaporation rate pulls the drying front at 0.2–0.5 mm/s, generating continuous fibre-like domains with a π–π stacking distance near 3.6 Å as confirmed by grazing-incidence wide-angle X-ray scattering. Electrical characterisation performed on a Keithley 4200‑SCS parameter analyser under inert atmosphere (O₂, H₂O <1 ppm) yields saturation mobilities of 2.1–3.8 cm²/V·s and threshold voltages below −5 V when the channel length is held between 20 μm and 50 μm. The terminal device is a flexible active-matrix organic light-emitting diode display prototype manufactured by screen-printing silver nanowire gate lines and subsequently laser-patterning the semiconductor layer for pixel-level isolation; the module passes the operational stability protocol of IEC 62860-1:2019 with less than 15% drain current decay after 1000 hours of continuous bias stress at 60 °C and 40% relative humidity, provided a 50 nm parylene‑C encapsulation is applied. Compliance for global distribution mandates that the powder feedstock carry a certificate of analysis confirming residual palladium below 10 ppm and total halide content below 50 ppm per EN 14582:2016, alongside a statement that the substance is pre-registered under REACH and free of Substances of Very High Concern (SVHC) listed in the Candidate List.Replacing fullerene-based acceptors with a narrow-bandgap small-molecule derivative of 2,5-dihydro-3,6-di-2-thienyl-pyrrolo[3,4-c]pyrrole-1,4-dione alters the donor‑acceptor miscibility and phase separation dynamics in a bulk heterojunction in ways that directly affect the photocurrent extraction path. When the DPP-thienyl acceptor is blended with a mid-gap donor polymer such as poly[[4,8-bis[5-(2-ethylhexyl)thiophen-2-yl]benzo[1,2-b:4,5-b']dithiophene-2,6-diyl][3-fluoro-2-[(2-ethylhexyl)carbonyl]thieno[3,4-b]thiophenediyl]] (PTB7‑Th) at a weight ratio of donor : acceptor = 1 : 1.2, the casting solution is prepared at 25 mg/mL total solids in chlorobenzene containing 3 vol% 1,8‑diiodooctane. The liquid is passed through a 0.45 μm PTFE syringe filter and blade-coated onto a pre-cleaned patterned indium tin oxide substrate heated to 45 °C, reaching a wet-film thickness that dries to 110 ± 10 nm. Immediately after drying, films undergo a thermal annealing step at 110 °C for 5 minutes inside a nitrogen-filled glovebox with O₂ < 0.1 ppm; this step promotes the formation of a finer intermixed donor–acceptor morphology that suppresses geminate recombination, as evidenced by a rise in the external quantum efficiency at 780 nm to over 65%. Under simulated AM 1.5G irradiation at 1000 W/m² calibrated with a silicon reference cell compliant to IEC 60904‑3:2019, the inverted architecture ITO/ZnO/active layer/MoO₃/Ag routinely delivers a power conversion efficiency of 10.2–11.8% with an open-circuit voltage of 0.82–0.86 V, limited largely by the non-radiative recombination loss of 0.25–0.30 eV. Manufactured modules of 150 × 150 mm are laser‑patterned into 12 series-connected cells and laminated between two ethylene‑tetrafluoroethylene sheets with butyl rubber edge seals that suppress moisture ingress below 5 × 10⁻³ g/m²·day; the panel meets the damp-heat endurance criteria of IEC 61215‑2:2021 for 1000 h at 85 °C/85% RH, showing less than 8% relative efficiency loss. Operational boundaries demand that the active layer never be exposed to amine-containing surface-cleaning agents because residual amines quench the photoinduced charge-transfer state and permanently reduce the fill factor.

    What limits the specific detectivity in DPP-thienyl-based inkjet-printed NIR photodiodes?

    For large-area image sensors that require a peak spectral response between 800 nm and 1000 nm, the DPP-thienyl chromophore is formulated as a polymer with a co-monomer that introduces a slight donor–acceptor push–pull shift, red-shifting the absorption onset to 1050 nm while keeping the HOMO level at −5.35 eV to minimise thermal population of charge-transfer states. The device stack is printed in ambient air on a polyethylene naphthalate foil pre-coated with a planarising UV-cured resin; the electron-blocking layer consists of a 40 nm inkjettable poly(3,4‑ethylenedioxythiophene):poly(styrenesulfonate) formulation with a conductivity of 600 S/cm, dried at 120 °C for 90 s under exhaust. Next, the ternary photoactive ink is jetted— a mixture of the DPP-thienyl copolymer, a fullerene derivative [6,6]-phenyl‑C₇₁‑butyric acid methyl ester, and a cross-linking agent added at 5 wt% relative to total solids, dissolved in o‑xylene:tetralin (85:15 v/v) at 15 mg/mL. After drying, a short ultraviolet‑C exposure (254 nm, 3 J/cm²) induces sufficient cross‑linking to render the layer insoluble during the subsequent slot‑die coating of the electron-transporting ZnO nanoparticle interlayer. The cathode contact is formed by screen‑printing a low‑work‑function calcium‑silver paste that is jointly encapsulated with a 50 µm optically clear adhesive foil containing a U‑V/vis-infrared transparent desiccant sheet. At a reverse bias of −1 V, the photodiode arrays attain a dark current density below 1.5 nA/cm² and a specific detectivity (D*) of 3.2 × 10¹² Jones at 940 nm, measured with a calibrated tungsten‑halogen source and a lock‑in amplifier setup according to the method described in ISO 20473:2007 (Optics and photonics — Spectral bands). The figure of merit is largely governed by the purity of the DPP monomer feedstock: metallic impurities, especially sodium and calcium ions above 50 ppb, increase trap‑assisted generation‑recombination noise and raise the dark current by an order of magnitude. Consequently, every batch of the DPP-thienyl monomer supplied for detector manufacture is accompanied by inductively coupled plasma mass spectrometry data (ICP‑MS) down to the sub-ppb level and a lot‑specific exclusion certificate for the 4,000+ substances listed in the IEC 62474 declarable substances database.

    Diketopyrrolopyrrole thiophene in high-hiding automotive OEM topcoats

    The chromophore, when micronised to a median particle size (D₅₀) of 45–65 nm via recirculation wet‑milling in a horizontal bead mill charged with 0.3 mm yttria‑stabilised zirconia beads, develops a deep bluish‑red masstone and an orange‑red tint in white let‑down, combining a CIELAB colour space chroma value (C*) exceeding 68 with a molar extinction coefficient of 4.2 × 10⁴ L·mol⁻¹·cm⁻¹ at 535 nm in toluene dispersion. In a solventborne acrylic‑melamine basecoat formulation intended for a two‑coat metallic finish, the pigment is introduced at a pigment‑to‑binder ratio of 0.15 : 1 (by weight on solids) under a pre‑dispersing step where the diketopyrrolopyrrole powder is wetted with a saturated polyester wetting agent and n‑butyl acetate in a dissolver at peripheral speeds of 18–22 m/s until the Hegman gauge reads 7.5 or finer. The let‑down slurry then passes through a three‑roll mill set to a front‑roll temperature of 30 °C and a gap pressure of 0.2 MPa to eliminate residual agglomerates; any oversize fraction is rejected through a 5 µm absolute‑rated bag filter before the coating is applied electrostatically at a dry‑film thickness of 12–15 µm and baked at 140 °C for 20 minutes. The cured finish resists overcoating with a two‑component polyurethane clearcoat without delamination, and its accelerated weatherability, evaluated per SAE J2527 under borosilicate‑filtered xenon‑arc exposure for 3000 kJ/m² at 340 nm, demonstrates a ΔE*ab below 2.5 units, attributable to the inherently robust lactam‑ring system of the DPP chromophore. For export into markets that adopt European Union food‑contact legislation, the pigment and its accompanying binder system are tested in a simulant migration trial under Regulation (EU) 10/2011 (acetic acid 3% w/v, 4 h at 100 °C), and the specific migration of total diketopyrrolopyrrole components remains below the detection limit of 0.01 mg/kg. Heavy‑metal limits conform to the 100 ppm aggregate threshold of the Council of Europe Resolution AP (89) 1 for colourants in plastics, while the absence of restricted aromatic amines under the German Bedarfsgegenständeverordnung is verified by EN 14362‑1:2017 on every production lot.Charge transport anisotropy and doping-induced conductivity for micro‑watt thermoelectricsTo capture low‑grade waste heat in the 60–120 °C regime for autonomous wireless sensor nodes, the thiophene‑flanked DPP unit is incorporated into a p‑type copolymer backbone alongside a carefully selected electron‑rich co‑monomer that keeps the Seebeck coefficient above 150 µV/K while pushing the electrical conductivity beyond 10 S/cm after doping. The doping protocol uses a sequential solvent‑assisted infiltration of iron(III) tris[bis(trifluoromethanesulfonyl)imide] (Fe(TFSI)₃) from a nitromethane solution (0.05 mol/L), spun at 2000 rpm onto the pre‑formed polymer film on glass‑fabric‑reinforced polyimide. The doped film is immediately rinsed with isopropanol and annealed at 80 °C for 10 minutes under dynamic vacuum, which drives the counter‑ion into the disordered side‑chain domains while leaving the π‑conjugated core predominantly intact, as confirmed by a 0.12 eV red‑shift of the HOMO onset in ultraviolet photoelectron spectroscopy. In‑plane electrical conductivity and the Seebeck coefficient are measured simultaneously on a homemade four‑point probe apparatus equipped with two calibrated type‑T thermocouples, referencing ASTM D257‑14 for contact resistance correction; a power factor of 35–42 µW/m·K² is reached with a doping concentration corresponding to roughly 8 mol% of the repeat unit. Manufacturing of the thermoelectric module proceeds by screen‑printing an array of 64 p‑type legs and an inorganic n‑type bismuth‑tellurium‑based paste onto a 62.5 µm Kapton substrate, creating an alternating structure that yields an open‑circuit voltage of 0.42 V across a temperature difference of 50 K. The primary operational constraint is the thermal depoling effect: when the hot side exceeds 140 °C for more than 30 min, the counter‑ion migrates toward the surface and the Seebeck coefficient degrades irreversibly by up to 20%, establishing a hard upper process limit for continuous operation. Regulatory compliance for thermoelectric films integrated into consumer electronics packaging relies on the RoHS 2011/65/EU Annex II exemption for lead‑free soldering of temperature sensors and the absence of decabromodiphenyl ether flame retardants within the module stack.

    Fluorescence “turn‑on” mechanism in the presence of cysteine over other biological thiols

    Upon functionalising the terminal thiophene positions of the pyrrolo[3,4‑c]pyrrole‑1,4‑dione core with electron‑withdrawing aldehyde groups, the resulting probe becomes weakly emissive due to a photoinduced electron transfer from the thiophene donor to the aldehyde acceptor, yet it can be triggered to a highly emissive state by the selective cyclisation reaction with cysteine (Cys). The probe is formulated as a stock solution in DMSO at 1 mM and then diluted into HEPES buffer (10 mM, pH 7.4) containing 5% fetal bovine serum to simulate an intracellular environment. Under these conditions, addition of Cys at 0–200 µM leads to a progressive fluorescence enhancement at 608 nm (λₑₓ = 480 nm) that plateaus after 15 minutes of incubation at 37 °C, as recorded on a spectrofluorometer fitted with a micro‑well plate reader. The detection limit, defined as 3σ of the blank noise, reaches 18 nM, a sensitivity that enables quantification of intracellular Cys in HeLa cell lysates when the probe is delivered at a loading concentration of 10 µM via a Pluronic F‑127 nanocarrier. The selectivity is attributed to the sterically favoured 7‑membered thiazinane cyclisation that occurs only with the free‑NH₂ and ‑SH moieties in spatiotemporal proximity; homocysteine and glutathione generate responses below 5% of the equimolar cysteine signal. Confocal microscopy with a 488 nm argon‑ion laser confirms lysosomal localisation (Pearson’s correlation coefficient 0.91 with LysoTracker Deep Red), and no photobleaching is observed during continuous 60‑frame scanning at 1% laser power. For biomedical export, the probe‑loaded nanocarrier system adheres to the in‑vitro cytotoxicity limits of ISO 10993‑5:2009, exhibiting > 85% viability of L‑929 fibroblasts after 24 h incubation, and the residual DMSO content is verified by headspace gas chromatography against the ICH Q3C(R8) impurity threshold of 0.5% w/w.
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    Certification & Compliance
    More Introduction

    2,5-Dihydro-3,6-di-2-thienyl-pyrrolo[3,4-c]pyrrole-1,4-dione, designated as DPP-Th2, constitutes a heterocyclic diketopyrrolopyrrole chromophore in its lactam oxidation state. The compound crystallizes in a monoclinic lattice and exhibits a molecular mass of 352.4 g mol⁻¹. When formulated as a high-performance organic pigment, it is supplied as a micronized powder with a primary particle size distribution D50 typically controlled between 0.06 µm and 0.10 µm as determined by transmission electron microscopy following ISO 13320:2020 laser diffraction. The surface area by BET nitrogen adsorption (ISO 9277:2010) ranges from 55 m²/g to 75 m²/g. These morphological parameters govern dispersibility in non-polar polyolefin matrices and polar engineering thermoplastics alike, and they distinguish the thienyl congener from the phenyl-substituted DPP pigments that dominate the C.I. Pigment Red 254 and 255 portfolio.

    Physical constants governing lot acceptance

    Commercial shipments are released against a certificate of analysis enumerating residues on a 45 µm sieve (ISO 787-7:2009, ≤ 0.1 %), oil absorption (ISO 787-5:1980, 40 – 55 g/100 g), and conductivity of aqueous extract (ISO 787-14:2019, ≤ 300 µS/cm). Volatile matter after 2 h at 105 °C remains below 0.5 %. The table below collates the core specification parameters alongside the reference methods that anchor batch-to-batch reproducibility.

    Reference specification and test methods for DPP-Th2 pigment powder
    ParameterSpecificationTest method
    Volatile matter≤ 0.5 %ISO 787-2:1981 (105 °C, 2 h)
    Residue on 45 µm sieve≤ 0.1 %ISO 787-7:2009 (wet sieving)
    Oil absorption40 – 55 g/100 gISO 787-5:1980 (linseed oil)
    Conductivity of aqueous extract≤ 300 µS/cmISO 787-14:2019
    pH of aqueous extract6.0 – 8.0ISO 787-9:2019
    Heat stability (HDPE, 5 min dwell)ΔE ≤ 2.0 at 300 °CISO 18314-3:2022

    Colorimetric coordinates are established in a fully broken stiff paste alkyd system (ASTM D387-22) after dispersion on an automatic muller. The masstone exhibits a deep bluish-red hue with a CIELAB hue angle hab near 345° – 350°, while reduction with titanium dioxide (1:10 TiO2 by mass) shifts the hue toward violet, with chroma exceeding 60. These color properties are inherently tied to the electron-donating character of the thiophene rings, which extend the conjugation length relative to phenyl-DPP analogues and produce a bathochromic shift of approximately 20 – 30 nm in the visible absorption maximum.

    What distinguishes the thienyl derivative from standard DPP scaffolds?

    Commercial DPP pigments based on 3,6-diphenyl substitution (C.I. Pigment Red 254, C.I. Pigment Red 255) dominate the mid-red shade area with excellent fastness properties. The replacement of phenyl with 2-thienyl moieties modifies both the electronic and steric landscape. In DPP-Th2, the sulfur atom participates weakly in intermolecular S···O close contacts, reinforcing the hydrogen-bonded ladder network characteristic of the DPP crystal. The effect is a measurable increase in crystal lattice energy, which translates into higher melting onset: differential scanning calorimetry of the crude pigment often shows no endothermic event below 350 °C, where thermal decomposition begins in air at 360 – 380 °C (thermogravimetric analysis at 10 K/min, ISO 11358-1:2022). Consequently, the pigment tolerates processing temperatures of 300 °C in high-density polyethylene and 310 °C in polypropylene homo-polymer without significant hue drift, a window roughly 10 – 15 °C wider than that of C.I. Pigment Red 254 under identical dwell-time conditions.

    From a fastness perspective, the thienyl substitution slightly elevates the intrinsic lightfastness in mass-tone applications. Accelerated xenon-arc exposure (ISO 4892-2:2013, cycle A1, 0.35 W/(m²·nm) at 340 nm, black panel temperature 65 °C) for 2000 h produces a CIELAB colour difference ΔE typically below 3.0 when the pigment is formulated at full shade in an automotive acrylic-melamine topcoat. The corresponding 1:10 reduction with TiO2 may show ΔE values approaching 5.0 – 7.0, which is still a marked improvement over 1,4-diketo-3,6-diphenyl-pyrrolo[3,4-c]pyrrole reductions tested under the same protocol. Published data for this specific thienyl configuration in SAE J2527 extended outdoor weathering remain limited; however, accelerated exposure data from structural analogs suggest that the sulfur moiety contributes marginally to free-radical quenching at the chromophore interface, retarding photo-oxidative cleavage of the lactam ring.

    During high-shear dispersion in a co-rotating twin-screw extruder (L/D = 40, screw diameter 27 mm, screw speed 600 – 800 rpm), the pigment is introduced via a side feeder at a let-down ratio of 40 – 50 % onto a low-density polyethylene carrier. The melt temperature measured at the die plate is held below 230 °C to prevent pre-mature crystal growth via Ostwald ripening in the presence of low-molecular-weight wax dispersants. When the specific energy input exceeds 0.25 kWh/kg, the pigment aggregates undergo comminution to below the 0.5 µm threshold required for transparent film applications, but excessive energy input above 0.35 kWh/kg has been observed in production-scale trials to generate fines that elevate the filtration pressure during screen-pack testing (ASTM D6267/D6267M-17), raising the ΔP across a 25 µm mesh by more than 1.2 bar relative to an optimally dispersed masterbatch. This process window conflict—between achieving full colour yield and avoiding micro-particulate gel formation—demands tight torque control and a restrictive screw profile with an increasing compression ratio in the plastication zone.

    When co-stabilizers alter the processing window

    In polyamide 6,6 compounded at melt temperatures of 280 – 290 °C, the combination of DPP-Th2 with certain hindered amine light stabilizers (HALS) containing secondary amino groups leads to an antagonistic effect visible as a yellow shift (Δb* increase) during 10-min residence-time trials in a capillary rheometer (ISO 11443:2021). The thiophene ring appears to undergo nucleophilic attack by the active HALS nitroxyl radical at elevated temperature, forming thiophene-S-oxide by-products detectable at trace levels via LC-MS of the extrudate. It is therefore recommended to pre-screen HALS packages using a 30-min dwell test in a Brabender Plastograph at 280 °C under nitrogen before compounding. Where amine-based thermal stabilizers are unavoidable, the pigment loading should be capped at 0.5 % by weight, and a phosphite secondary antioxidant (e.g., tris(2,4-di‑tert‑butylphenyl)phosphite) must be added at a stoichiometric excess of at least 2:1 relative to the HALS concentration to scavenge peroxy radicals preferentially.

    Pre-drying of the pigment powder is mandatory when ambient relative humidity exceeds 60 %. The powder is to be dried in a vacuum oven at 80 °C for a minimum of 4 h or in a dehumidified-air dryer with a dew point of −30 °C until the volatile content falls below 0.3 %. Failure to pre-dry results in splay and surface defects on injection-moulded plaques, and in the presence of moisture, the pigment’s crystal lattice can accommodate water molecules at grain boundaries, producing an irreversible reduction in tinting strength of up to 15 % when exposed to melt temperatures above 260 °C.

    During electrostatic spray application of TGIC-free polyester powder coatings, DPP-Th2 provides a route to deep violet shades without the use of dioxazine violet (C.I. Pigment Violet 23) or quinacridone pigments that can exhibit rheological discontinuity in filled systems. The powder coating is extruded on a co-rotating twin-screw extruder with a barrel temperature profile of 90 – 120 °C and a screw speed of 450 rpm, then cryogenically ground and sieved to a particle size distribution D50 below 40 µm (ISO 8130-1:2019). Curing at 200 °C for 10 min yields a gloss level of 90 – 95 GU at 60° (ASTM D523-14) with no detectable pigment migration into the over-baked clearcoat after 30 min at 220 °C, confirmed by cross-sectional EDS analysis. Blends with rutile TiO2 (TiO2:pigment = 10:1) shift the cured colour toward a red-violet with exceptional opacity; contrast ratio exceeds 0.98 at a film thickness of 60 µm (ISO 6504-3:2019).

    Comparative fastness and migration resistance: thienyl-DPP vs. C.I. Pigment Red 254 in 1 mm HDPE injection-moulded plaques
    PropertyDPP-Th2C.I. Pigment Red 254Test methodology
    Lightfastness (full shade)Blue wool scale 7 – 8Blue wool scale 7 – 8ISO 105-B02:2014 (xenon, 2000 h)
    Weatherfastness (1:10 TiO2 reduction)ΔE ≤ 7.0 after 2000 hΔE ≤ 9.5 after 2000 hISO 4892-2:2013 cycle A1
    Migration into flexible PVCRating 5 (no migration)Rating 5ISO 18314-4:2021 (80 °C, 24 h, 5 kg)
    Migration into ABS (260 °C)Rating 4 – 5 (faint halo)Rating 4EN 12877-2:1999 (contact bleed)
    Warpage deflection in PP homopolymer1.2 mm (100 mm disc)2.4 mmISO 294-4:2018 mold, measured 48 h post-molding

    Injection molding of glass-fiber reinforced polybutylene terephthalate (PBT-GF30) at a melt temperature of 270 °C and mold temperature of 90 °C highlights a critical difference between the thienyl-substituted DPP and conventional high-performance reds. Mold deposit accumulation on the cavity surface, quantified by gravimetric analysis after 500 cycles, is reduced by approximately 40 % compared with C.I. Pigment Red 254 at an equal pigment loading of 0.3 %. The lower volatile condensate formation is attributed to the higher thermal stability of the thienyl-DPP lattice, which generates fewer sublimation nuclei at the melt front under holding pressures of 800 – 1000 bar. The warpage deflection of an unfilled PP disc (diameter 100 mm, thickness 2 mm) pigmented at 0.2 % was measured according to ISO 294-4:2018 after 48 h conditioning at 23 °C and 50 % RH; the value of 1.2 mm contrasts with the 2.4 mm recorded for the phenyl analogue, indicating significantly reduced nucleation-induced differential shrinkage. This behavior becomes a decisive factor in thin-wall packaging applications where dimensional tolerance dictates tooling geometry.

    In transparent PET fiber spinning, the pigment must be pre-dispersed to a maximum particle agglomerate size below 1 µm to prevent filament breakage at draw ratios of 4:1. The dispersion quality is verified by filter pressure rise testing (EN 13900-5:2015) using a 15 µm screen pack; a pressure increase below 0.5 bar per 10 min is the acceptance criterion for spinnable formulation. DPP-Th2 in a liquid pre-dispersion carrier (polypropylene glycol, Mn ≈ 400 g/mol) meets this target at a pigment concentration of 20 wt%, whereas the phenyl-substituted analogue at identical loading requires a second milling pass to achieve comparable filtration performance.

    For thin-film photovoltaic applications where DPP-Th2 serves as a precursor for solution-processable small-molecule acceptors, purity specification shifts drastically. The pigment-grade material must undergo zone-refining or vacuum sublimation (pressure ≤ 10⁻⁶ mbar, temperature 280 °C) to achieve a metal-halide residue level below 10 ppm each for palladium and iron, as quantified by ICP-MS following microwave digestion (EPA 3052). Subsequent Suzuki or Stille coupling at the 2- and 5-positions of the thiophene ring to install additional donor segments proceeds with steric hindrance profiles distinct from those of 3,6-diphenyl-DPP; the thienyl sulfur lone pairs accelerate oxidative addition with Pd(0) catalysts but also promote competing C–H activation at the thiophene 5-position when reaction temperatures exceed 110 °C, a nuance that requires strict thermal management of the coupling step and is absent in the purely phenyl-substituted motif. Published kinetic data for the thienyl-substituted monomer in direct arylation polymerization indicates a turnover-limiting step at 100 °C with an activation barrier of 68 ± 2 kJ/mol (Eyring plot, THF/dioxane 1:1), providing a reproducible metric for reactor scale-up.

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