A SR(II)-ZR(IV)-CD(II) ALKOXIDE CLUSTER - SYNTHESIS AND X-RAY STRUCTURE OF [(CD(OPRI)(3))SR(ZR-2(OPRI)(9))](2)

New heterotrimetallic alkoxide [{Cd(OPr1)(3)}Sr{Zr-2(OPr1)(9)}](2) (1) is obtained quantitatively in an anion-exchange reaction involving we ll-characterised iodide heterobimetallic alkoxide ICd{Zr-2(OPr1)(9)} a nd the alkali metal reagent KSr(OPr1)(3). The formation of 1 is accomp anied with an exchange of metals (Cd(II) and Sr(II)) between the const ituting fragments ('Cd{Zr-2(OPr1)(9)}(+)' and 'Sr(OPr1)(3)(-)') and th e chelating Zr-2(OPr1)(9)(-) anion, in 1, coordinates to Sr2+ in contr ast to the precursor ICdZr2(OPr1)(9) where it is bound to Cd2+. The he terotrimetallic nature of 1 is unambiguously established by multinucle ar(H-1, C-13 and Cd-113) NMR spectral data and a single crystal X-ray diffraction analysis.