SYNTHESIS, STRUCTURE, AND REACTIVITY OF IODO-FUNCTIONALIZED HETEROBIMETALLIC ALKOXIDES OF TIN(IV) - X-RAY CRYSTAL-STRUCTURES OF [I2SN(AL(OPRI)(4))(2)], [I2SN(TI(OPRI)(5))(2)], [I3SN(ZR(OPRI)(5)((PROH)-O-I))], AND [I2SN(MO(C5H5)(CO)(3))(2)]

A series of new iodide heterobimetallic isopropoxides [I2Sn{Al(OPri)(4 )}(2)] (1), [I2Sn{Ti(OPri)(5)}(2)] (2), [I2Sn{Nb(OPri)(6)}(2)] (3), an d [I3Sn{Zr(OPri)(5)((PrOH)-O-i}] (4) obtained on reacting SnI4 with st oichiometric amounts of alkali-metal reagents [KAl(OPri)(4)](n), [KTi( OPri)(5)](n), [KZr(OPri)(5)](n), and [KNb(OPri)(6)](n), respectively, is reported. The monomeric formulation and hexacoordination of tin pro posed for 1-4, on the basis of microanalytical, cryoscopic, and multin uclear (H-1, C-13, Al-27, and Sn-119) NMR spectral data, was establish ed for 1, 2, and 4 by single-crystal X-ray diffraction analysis. The s olid-state structures of 1 and 2 feature an approximately octahedral t in(IV) center bearing two terminal iodide ligands and two bidentate {A l(OPri)(4)}- and {Ti(OPri)(5)}(-) moieties, containing aluminum or tit anium atoms in a distorted tetrahedral or trigonal-bipyramidal environ ment of OPri ligands, respectively. The crystal structure of 4 represe nts a bioctahedron formed by the face-sharing interaction of two sligh tly distorted octahedra built around Sn(IV) and Zr(IV) centers. Compou nds 1 and 2, when allowed to react (1:2) with the transition-metal der ivative Na[Mo(C5H5)(CO)(3)], afford the Sn-Mo-bonded cluster [I2Sn(Mo( C5H5)(CO)(3)}(2)] (5) as the only isolable product, in both the cases.