Organotin hydroxides, alkoxides, and related compounds

The structure of the simplest organotin hydroxide, trimethyltin hydroxide, MesSnOH, has not been fully characterized although it has been subjected to an 

X-ray diffraction analysis, and is described as polymeric [384]. An indication of the association of trimethyltin moieties via hydroxo groups is given by the structure of the adduct 2Me3SnOH Me3SnI, which contains a trimetallic cationic species, 130 [386], 

Triethyltin hydroxide [Et3SnOH] c has been fully characterized structurally and contains trigonal-bipyramidal tin with OH groups in axial positions (Sn O 2.156 and 2.244 A) forming zigzag chains bent at oxygen (O-Sn-0 177.9°, Sn-O-Sn 145.5°) [387]. 

A clear supramolecular self-organized structure, 131, associated through hydroxo bridges (Sn-O 2.197 A, Sn O 2.255 A), has been determined for triphenyltin hydroxide, PhsSnOH [388] benzyldimethyltin hydroxide has a similar zigzag chain structure (Sn-O 2.17 A, Sn — O 2.29 A). Cryoscopic measurements show that the compound is dimeric in benzene solution [389], 

Other triorganotin hydroxides, containing bulky substituents, e.g. trineophyltin hydroxide [390] and trimesityltin hydroxide (Sn-O 1.999 A) [391], are monomeric, non-associated. 

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