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Synthesis, Characterization and Structural Aspects of Three New Nonsymmetrical Bimetallic Dibutyltin (IV) Derivatives

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Author(s): Farfán , Norberto | Ochoa , Ma. Eugenia | Reyes , Horacio | Romero , Margarita | Santillán , Rosa

Journal: Revista de la Sociedad Química de México
ISSN 0583-7693

Volume: 51;
Issue: 1;
Start page: 39;
Date: 2007;
Original page

Keywords: Diorganotin (IV) derivatives | Multinuclear NMR | X-ray structure.

ABSTRACT
Three new nonsymmetric bimetallic diorganotin compounds derived from hexadentate Schiff bases were obtained by reaction of 2,6-dihydroxybenzene-1,3-dicarbaldehyde with R-(-)-phenylglycinol, glycine and 2-amino-5-nitrophenol, in the presence of dibutyltin oxide. The full multinuclear NMR analysis, IR and elemental analyses allowed to establish the structures of all new compounds. In the three cases, the 119Sn chemical shifts are indicative of two different pentacoordinated tin atoms in solution. The molecular structure of compound 4 in the solid state shows two distinct tin atoms with different geometries, one is a distorted trigonal bipyramid with the oxygen atoms in the axial positions and the organic moieties and imine nitrogen in equatorial ones; while the other tin shows distorted octahedral geometry due to Sn(2)-O(4) intermolecular coordination, leading to a dimeric specie, with a Sn-O-Sn-O four-membered ring. The most interesting issue in the solid state is that only one of the tin atoms exhibits intermolecular coordination, in spite of the fact that the atoms are nearly equivalents.
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