Dithieno dithiophene

Borepino[3,2-6 6,7-6 ]dithiophene, 4-methyl- H NMR, 1, 636 Borepinodithiophenes theoretical methods, 1, 633 Borepins dithieno fused 11B NMR, 1, 636 fused... 

The polymers of 4H-cyclopenta[2,l-b 3,4-//Jdi thiophene derivatives showed absorptions in the range 560-590 nm [03MM2705]. Some monomers are based on the nonaromatic (12 n electrons) 4H-cyclopenta[2,l-fr 3,4-l/]dithiophen-4-yl cation 580a (X = CH+) model which was expected to display a reduced HOMO-LUMO separation, compared to related aromatic fused systems (i.e., 580, X = S, O, NF1) (91JCS(CC)752). Polymers of 580 (X = S) showed absorption at 480 nm. Poly(dithieno[3,4-b 3, 4 -4J thiophene) showed an absorption at 590-610 nm (89SM(28)C507 97MI23). 

A series of novel dithieno[3,2-A2, 3 -r7lphospholes 159 have been prepared in good yields by reacting 3,3 -dibromo-2,2 -dithiophene derivatives with butyllithium and subsequent addition of dichlorophosphines (Scheme 49) <2004AGE6197, 2005EJC4687>. Note that 5,5 -bis(pinacolboryl)-functionalized dithieno[3,2-A2, 3 -r7lphospholes 160 have been prepared by sequential lithiation and addition of isopropoxy(pinacol)borane to the unsubstituted dithienophosphole (Scheme 49) <20060L495>. 

Horie and coworkers used phosphine-free conditions in NMP to couple 4,4-bis(2-alkyl)-4//-eyelopenta[2,l-ft 3,4-fc ]dithiophene (CPDT), A -(l-alkyl)dithieno[3,2-b 2, 3 -fi(]pyrrole and 4,4 -bis(2-alkyl)dithieno[3,2- ) 2, 3 -t/]-silole with dibrominated (hetero)arenes to give polymers 19-23 (Chart 19.5). Polymers with high molecular weights were only achieved for 19 (M = 72 kDa, PDI = 4.5) due to side reactions and insolubiUty of the other polymers. ... 

The first example of a narrow band-gap polymer is polyisothianaphthene [Structure (8)] with a band gap of near 1.0 eV [74,75]. Other polymers designed and synthesized with the intention of developing narrow band-gap polymers include poly(dithieno[3,4-b 3, 4 -d]thiophene [76], poly-4//-cy clopenta[2,1 -6 3,4-/ ]dithiophen-4-one [77], poly-4-dicyanimethy lene-4//-cyclopenta[2,l-6 3,4-6 ]dithiophene [78], poly(2,3-dihexylthieno[3,4-6]-pyrazine (9) [79], polysquaraines [80], polycroconaines [80], poly-(naphtho[2,3-c]thiophene-fl//-bithiophene) (10) [81], a polymer containing... 

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