Monomers and polymers containing Si-O-As linkages

[(C6H5)(3)SiO](2) As was prepared by the interaction of AsCl3 with (C6H5)(3) SiONa or with (C6H5)(2)SiOH in the presence of NH3. It was also prepared by the cohydrolysis of AsCl3 and (C6H5)(3)SiCl. [(C6H5)(3)SiO](3)AsO was prepared by the reaction of (C6H5)(2)SiCl with KH2AsO4. The macro-molecular species, (HO)(2)As(O)[OSi(C6H5)(2)OAs(O)OH](2) OH was prepared by the interaction of (C5H6)(2)SiCl2 with KH2AsO4 at room temperature. This product slowly decomposed to give a material whose composition approached [OSi(C6H5)(2)OAs(O)OH](2). As[OSi(C6H5)(2)O](2). As was prepared by the cohydrolysis of AsCl3 and (C6H5)(2)SiCl2 and also by the interaction of AsCl3 with (C6H5)(2)Si(OH)(2) in the presence of either (C2H5)(3)N or NH3. The physical, thermal and hydrolytic properties of the compounds prepared were examined.