Synthesis, reactions and spectroscopic studies of some novel hetero (bi- and tri-) metal alkoxides of tin(IV) with niobium and tantalum

Abstract

Novel (chloro)isopropoxo niobates and -tantalates of tin(IY) with the formulae Cl_4-nSn{M(OPr<em>ⁱ</em>)₆}_n, (n = 1-3) have been synthesized by the reactions of SnC1₄ with an appropriate potassium hexaisopro-poxometallate, KM(OPr<em>ⁱ</em>)₆ (M= Nb/Ta) in the required molar ratios. These chloro precursors have been used to obtain derivatives of the types (RO)₂Sn{M(OPr<em>ⁱ</em>)₆}₂ (R=Me, Pr<em>ⁱ</em>, Bu<em>ⁱ</em>), {Ta(OPr<em>ⁱ</em>)₆}₂Sn{Nb(OPr<em>ⁱ</em>)₆}₂ and {AI(OPr<em>ⁱ</em>)₄}ClSn{Nb(OPr<em>ⁱ</em>)₆}₂ by the replacement reaction of the chloride with appropriate potassium alkoxide or isopropoxometallate. Characterization of these novel complexes has been carried out on the basis of elemental and alkoxo group analyses, IR and multinuclear (^lH, ¹³C, ²⁷Al and ¹¹⁹Sn) NMR data and molecular weight studies.