Optical activity alkyl polysilane

Figure 3 shows a correlation between the values of e, fwhm and a of various poly(dialkylsilane)s and poly(alkylarylsilane)s in THF at 30 °C [41]. The polymers include seven optically active helical poly(dialkylsilane)s with four different types of chiral f-, y-, or 5-branched alkyl substituents, 11 optically inactive poly(dialkylsilane)s with six different types of achiral / -, y-, or 5-branched substituents, an optically inactive helical poly(dialkylsilane) with racemic chiral side groups, and two optically inactive helical poly(alkyl-phenylsilane)s. It is evident that, for the polysilanes whose Amax ranges from 290 to 352 nm, although the value of e increases exponentially with an in-... 

By introducing p- and y-branched chiral alkyl moieties on Si atoms, the corresponding poly(dialkylsilane)s become optically active due to the adoption of a thermally stable and thermoresponsive 7/3 helical conformation in organic solvents. When p- and y-branched achiral dialkyldichlorosilanes are used, the resulting polysilanes adopt optically inactive 7/3 helical conformation due... 

---