ABSTRACT The coordination chemistry of tin covers a huge field, as shown by a recent survey covering the crystallographic and structural data of almost six hundred examples about 10% of these complexes exist as isomers and are summarised in this review. Included are distortion (96.5%) and cis – trans (3.5%) isomerism. These are discussed in terms of the coordination about tin atom, and correlations are drawn between donor atom, bond lengths and interbond angles. Distortion isomers, differing only by degree of distortion in Sn – L bond distances and L – Sn – L angles, are the most common. The Sn atoms are found in oxidation states +2 and +4, from which the latter is by far the most common.
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