Thienylene-vinylene oligomers

Havinga et al. have obtained alkoxy-substituted thienylene-vinylene oligomers via reactions of ( )-bis(tributylstannyl)e ene with substituted 2,5-dibromothiophenes [56]. 

Havinga E. E., Mutsaers C. M., and Jenneskens L. W. Absorption properties of alkoxy-substituted thienylene-vinylene oligomers as a function of the doping level, Chem. Mater., 1996,8, 3, 769-776, DOI 10.1021/cm9504551. 

During the past three years we have been studying the chemical (SbCl5) oxidation of well-characterized oligomers of polyacetylene, poly[p-phenylene vinylene] (PPV) and poly[2,5-thienylene vinylene] (PTV) in order to determine how polaron and bipolaron states can be preferentially formed and stabilized. 

Charge-state generation in poly[2,5-thienylene vinylene] (PTV) and PTV oligomers... 

SbCls, NOSbF. In doped oligomers of poly(thienylene vinylene), stable bi-polaron-like charged species are formed. In contrast to poly(p-phenylene vinylene) oligomers, polaronic-like charge states can also be formed by careful... 

How much do the results we have obtained here tell us about the fundamental limits to the mobilities of carriers in devices fabricated with polymer that is very much better ordered than the polyacetylene that we have used here There are recent reports of very much improved mobilities for devices based on sexithiophene (the six repeat unit oligomer of polythiophene), with a value of 0.4 cm /Vsec now reported [73], and there is now considerable interest in the development of polymer FETs as large area thin film transistors, with interest in polythiophene derivatives [74] and in poly(arylenevinylenes) such as poly(2,5-thienylene vinylene) [75]. We can see from the optical characterisations of the MIS devices that the surface layer of polyacetylene formed on SiC>2 is very much more disordered than the bulk material, but we have not made FET devices with the polymer insulator layers which give better ordered structures as characterised optically. 

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