Abstract
The Si-backbone in crystalline poly(di-n-hexylsilane) (PDHS) is known to be all-trans, whereas the chain conformation of poly(di-n-butylsilane) (PDBS) has been shown to form a 7/3-helix in the solid state. It is demonstrated here that all-trans PDBS can be produced by two methods: precipitation from dilute solution at low temperature, and by application of moderate pressure to the solid polymer. The absorption maximum of all-trans PDBS is red-shifted 40 nm from that of the 7/3-helical form. The effect of pressure on the solid-solid phase transitions in both PDBS and PDHS is presented.
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