Synthesis and characterisation of a new class of heterotrimetallic isopropoxides of strontium and barium

New heterotrimetallic isopropoxides of the types {M-2(OPr-i)(9)}M'{M "(OPr- i)(5)} (M = Zr, Sn(IV); M' = Sr, Ba; M " = Ti, Sn(IV)) and {Sn-2(OPr-i)(9)} Sr{Al(OPr-i)(4)} have been synthesised for the first time by the single-pot reactions of metal isopropoxides (e.g., M'(OPr-i)(2) (M' = Sr, Ba), Ti(OPr -i)(4), Sn(OPr-i)(4). i-PrOH, or Al(OPr-i)(3)) in the desired molar ratios in refluxing benzene. All of these novel derivatives have been characterise d by elemental analyses, molecular weight measurements, and spectroscopic [ IR, NMR (H-1, C-13, Al-27, Sn-119)] studies. Reactions of the derivative {Z r-2(OPr-i)(9)}Ba{Sn(OPr-i)(5)} with alcohols (Me3CCH2OH and Me3COH) have be en carried out to shed light on its possible structural features.