Dimethyl-oligothiophenes

Longer oligothiophenes can only be studied in solution when they are alkyl-substituted. Dimethyl-oligothiophenes (DManT) with = 4,6,8,10 were studied by Zotti et at. [205]. For DMa4T they found... 

Bandini has described the grafting of diamino-oligothiophene compounds onto the monomethyl ether of PEG5000 to give the soluble polymer 256 (Scheme 104) [161]. High yield (98%) and ee (99%) were observed with soluble polymer 256a when the allylic alkylation reaction between 1,3-diphenylallyl and dimethyl malonate was performed in THF... 

Barbarella et al. also synthesized a series of bis(dimethyl-rerf-butylsilyl)oligothiophenes [70]. Vacuum-evaporated thin films of the quinquethiophene 11 afforded pfet of 3 x 10 " cm V s and... 

Figure 8.14. Chemical structures of a series of the dimethyl-substituted oligothiophenes. The structures denote dimethyl-bithiophene (dimer DMBT), dimethylterthiophene (trimer DMTT), dimethylquaterthiophene (tetramer DMQtT), di-methylquinquethiophene (pentamer DMQqT), and dimethyl-sexithiophene (hexamer DMSxT) from the top. The x and y axes represent the directions of the molecular long and short axes, respectively. Reprinted with permission from Reference 174. Copyright 1993 American Chemical Society.

Figure 8.21. Electronic spectra of some dimethyl-substituted oligothiophenes doped with NOPF in dichloromethane solution at different two doping levels relative to the neutral form, (a) DMTT and (b) DMQqT. The spectra are labeled with figures that denote the number of NOPF molecules per diiophene ring. Reprinted with permission from Reference 22. Copyright 1991 The Royal Society of Chemistry.

Table 8.6 Characteristic band positions for various dimethyl-substituted oligothiophenes. Reprinted with permission from Reference 174. Copyright 1993 American Chemical Society.

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