Acta Cryst. (2007). E63, m1547-m1548  [ doi:10.1107/S1600536807020302 ]

Bis{-2-hydroxy-5-[(E)-2-(2-methoxyphenyl)diazenyl]benzoato}bis(di-n-butyl{2-hydroxy-5-[(E)-2-(2-methoxyphenyl)diazenyl]benzoato}tin(IV))

A. Linden, D. Wolstenholme, T. S. Basu Baul and W. Rynjah

Abstract: The title compound, [Sn₂(C₁₄H₁₁N₂O₄)₄(C₄H₉)₄], is a further example from a series of 5-[(E)-aryldiazenyl]-2-hydroxybenzoate complexes with di-n-butyltin(IV). The structure consists of centrosymmetric dimers formed by the linking of two monomers via long SnO interactions of 3.192 (5) Å. Each Sn atom has a skewed trapezoidal bipyramidal inner-sphere coordination geometry with the O atoms from two carboxylate ligands in the equatorial plane and disordered butyl groups occupying axial positions. The singly-bonded carboxyl O atoms from each ligand form coordination Sn-O bonds (ca 2.11 Å) and are cis to one another, while the carbonyl O atoms from the ligands have one lone pair donating into empty orbitals on the Sn atom in a dative fashion, which results in significantly longer Sn-O bonds of ca 2.56 Å. The long SnO interactions complete a pentagonal bipyramidal coordination geometry at the Sn atom. Several types of O-HO hydrogen bonds and C-HO close contacts are present.

Online 30 April 2007

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