Diaryl-substituted polysilane

In this chapter, we report measurements on a diaryl-substituted polysilane, poly[bis(p-n-butyl)phenylsilane] (PBPNBPS), in which the bulky phenyl groups may provide more substantial steric hindrance to rotational freedom than do the dialkyl substituents. Reported values of the wavelength of maximum electronic absorption are large (395 10 nm) and cannot be attributed solely to electronic substituent effects (4). 

In the diaryl-substituted polysilane, the global dimensions are approximated by a wormlike chain model with a persistence length of 100 A. Thus, for the highest molecular weight studied, LIq — 100, and the chain dimensions are similar to those of a flexible-model Kuhn chain with bond lengths IkOf —200 A, that is,... 

A HE FIRST DIARYL-SUBSTITUTED POLYSILANE derivative was probably prepared over 60 years ago by Kipping (i). The simplest dialkyl-substituted material, poly(dimethylsilane), was described in 1949 by Burkhard (2). These materials are highly insoluble and intractable and attracted little scientific interest until recently. 

Some Recent Studies Models for the para-Alkoxy Diaryl Substituted Polysilanes... 

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