Mixed Oligomers and Polymers Based on Dibenzophosphole or Dithienophosphole

Mixed Oligomers and Polymers Based on Dibenzophosphole or Dithienophosphole 

Dibenzophospholes A and dithienophospholes B and C (Fig. 4.7) do not display the typical electronic properties and reactivity patterns of phospholes, since the dienic system is engaged in the delocalized benzene or thiophene sextet [7, 10a, 51]. In fact, these building blocks have to be regarded as nonflexible diaryl-phosphines or as P-bridged diphenyl or dithienyl moieties. 

Analysis of the bond lengths of compounds 75a,b and the square-planar complex 77 in the solid state reveals a high degree of jt-conjugation of the fused sys- 

Dithienophosphole units have been incorporated into polymers as either (i) side-chains or (ii) building block constituents of the extended polymer backbone itself. Polymers of the first type have been prepared by exploiting the ease with which a polymerizable styryl substituent may be introduced at the P atom of 

It is clearly evident that the various series of conjugated polymeric systems based on dithienophospholes that have been prepared are promising candidates for optoelectronic applications since their optical properties can be easily varied in a variety of different ways (chemical modifications of the P center, variation of the Si and P substituents, etc.). Furthermore, their potential scope in a range of applications is broadened by the possibility of incorporating these conju- 

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