Organotin(IV) Complexes Containing Sn–O–Se Moieties: A Structural Inventory

Abstract

This review focuses on organotin compounds exhibiting Sn–O–Se moieties, the molecular structures of which have been previously resolved by single-crystal X-ray diffraction analysis. Three distinct classes of compounds have been identified. Thus, the various modes of coordination of selenite, selenate and organoseleninate anions with tin atoms of organotin(IV) fragments are illustrated and detailed.1 Introduction2 Organotin(IV) Selenite Complexes3 Organotin(IV) Selenate Complexes4 Organotin(IV) Organoseleninate Complexes5 Summary

CO2 Derivatives of Molecular Tin Compounds. Part 2: Carbamato, Formato, Phosphinoformato and Metallocarboxylato Complexes

“…Two distinct sites of tin atoms are distinguished: (i) those located in the main chain exhibiting a trigonal bipyramidal geometry (TBP) whose equatorial plane is occupied by three methyl substituents and the apical positions by two oxygen atoms; (ii) SnMe 3 pendant groups, connected to the main chain by nitrogen atoms (Sn-N = 2.04(2) Å) and positioned in a syndiotactic arrangement, and whose tin atoms exhibit a tetrahedral geometry. This type of architecture is comparable to the chain-like structures reported for the organotin(IV) selenite complexes, (Me 3 Sn) 2 SeO 3 •H 2 O and (Ph 3 Sn) 2 SeO 3 [43], as well as for the organotin(IV) carbonato complexes, (Me 3 Sn) 2 CO 3 and (i-Bu 3 Sn) 2 CO 3 [44]. However, the authors pointed out that, despite the presence of a hydrogen atom on the nitrogen of carbamato groups, no hydrogen bonds are observed between the chains, which is explained by the proximity of bulky Me 3 Sn groups.…”

Organotin(IV) selenate derivatives – Crystal structure of [{(Ph3Sn)2SeO4} ⋅ CH3OH] n

“…An inventory of crystallographic structures of organotin complexes exhibiting SnOSe moieties was recently reviewed, highlighting the existence of a great diversity of compounds involving selenite, selenate and organoseleninate derivatives (Plasseraud, 2018). Based on bridging SeO4 2 groups, the class of organotin(IV) selenate exhibits the predominance of polymeric structures, involving in particular inorganic chains, with tin atoms exhibiting trigonal bipyramidal geometries.…”