PDPP4T (CAS number 1267540-03-3) is a promising class of semiconducting polymers for organic solar cells. This is due to its small optical band gap and high charge-carrier mobility. It is also known as Poly[2,5-bis(2-octyldodecyl)pyrrolo[3,4-c]pyrrole-1,4(2H,5H)-dione -3,6-diyl)-alt-(2,2’;5’,2’’;5’’,2’’’-quaterthiophen-5,5’’’-diyl)] or DPP4T.

General Information

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Full Name	Poly[2,5-bis(2-octyldodecyl)pyrrolo[3,4-c]pyrrole-1,4(2H,5H)-dione -3,6-diyl)-alt-(2,2’;5’,2’’;5’’,2’’’-quaterthiophen-5,5’’’-diyl)]
Synonyms	DPP-4T DPP4T pDPP PDQT
CAS Number	1267540-03-3
Chemical Formula	(C62H90N2O2S4)n
Molecular Weight	See batch details table below
HOMO and LUMO	HOMO = -5.2 eV, LUMO = -4.0 eV [7]
Classification or Family	Quaterthiophene, Heterocyclic five-membered ring, Organic semiconducting materials, Low band gap polymers, Organic photovoltaics, Polymer solar cells, OFETs

The Chemical structure of PDPP4T, CAS 1267540-03-3

Characterization

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Soxhlet extraction was carried out using methanol, acetone, hexane, and then chlorobenzene as washing solvents under argon. Chlorobenzene fraction was concentrated, precipitated with methanol, and dried under vacuum at 40 oC for 48 hours. GPC was carried out using 1,2,4-trichlorobenzene as eluent at 140 oC by using polystyrene as standards.

Molecular weight distribution of PDPP4T chlorobenzene Soxhlet fraction from GPC analysis

Synthetic Route

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DPP4T was synthesized by using 3,6-bis(5-bromothiophen-2-yl)-2,5-bis(2-octyldodecyl)pyrrolo[3,4-c]pyrrole-1,4(2H,5H)-dione and 5,5'-bis(trimethylstannyl)-2,2'-bithiophene as starting materials via Stille Coupling polymerisation in chlorobenzene. Targeted polymer was purified using Soxhlet extraction with methanol, acetone, hexane and finally chlorobenzene as washing and extracting solvents.

PDPP4T synthesis via a Stille Coupling reaction with 3,6-bis(5-bromothiophen-2-yl)-2,5-bis(2-octyldodecyl)pyrrolo[3,4-c]pyrrole-1,4(2H,5H)-dione and 5,5-bis(trimethylstannyl)-2,2-bithiophene as starting materials.