S. V. Medvedev

The trans-strengthening of the SnO bond in six-coordinated complexes of tin(IV): Crystal and molecular structures of SnI4·2DPSO and C2H5SnI·2DPSO

An X-ray study of SnI4·2diphenylsulphoxide and EtSnI3·2diphenylsulphoxide indicates octahedral geometry for all the tin atoms in both complexes, the two DPSO ligands being cis to each other and in the second complex the ethyl group being trans to one of the DPSO ligands. In the second complex, under the influence of the ethyl group lengthening of the cis SnI bonds by 0.06 A and shortening of the trans SnO bond by 0.06 A occur. The mutual dependence of the SnO and OS bond distances is noted.

Trans-Strengthening in tin(IV) anionic complexes

Abstract X-Ray studies of (NMe 4 ) 2 EtSnCl 5 , (NMe 4 ) 2 BuSnBr 5 and (NMe 4 ) 2 SnBr 6 indicate octahedral geometry for all the tin atoms. In the first two complexes, under the influence of the alkyl group, the cis -Sn—Hal bonds are lengthened by 0.11 A (Hal = Cl) and 0.09 A (Hal = Br), while the trans -Sn—Hal bonds are shortened by 0.03 A (Hal = Cl) and 0.05 A (Hal = Br).

Crystal and molecular structures of complexes of diethyldibromotin with triphenylphosphine oxide and hexamethylphosphoric triamide

The crystal and molecular structures of the Et/sub 2/SnBr/sub 2/ x 2TPPO complex and two crystal modifications of the Et/sub 2/SnBr/sub 2/ x 2HMPT complex were determined by x-ray diffraction analysis. The complexes are mononuclear, and the coordination polyhedron of the tin atom is a slightly distorted octahedron. The regularities of cis weakening of the Sn-Br and Sn-O bonds under the influence of donor ethyl groups were ascertained.

Crystal and molecular structure of SnBr4·2OP(C6H5)3

The complex was obtained by mixing benzene solutions of tin tetrabromide and TPPO in stoichiometric proportions. The precipitate which formed was filtered, washed with benzene, and then twice with pentane and vacuum dried. The results of elemental analysis were (%): C 43.47, H 3.41, Br 32.40; calculated for the formula C36H~oBr~O2P2Sn (%): C 43.46, H 3.04, Br 32,13. Tmelting ~260 ~ C (decomposition). Single crystals for the x-ray structural investigation were-0btained by heating a dry solution of the complex in a mixture of CH=CI2/ octane at room temperature.

Crystal and molecular structure of the octahedral complex of EtSnBr3·2TPPO

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