Crystal structure of di-μ-hydroxobis[fac-trichloroaquotin(IV)] tetrahydrate, [Cl3(H2O)Sn—OH—]2•4H2O, with observations on distances and MOM angles in di-μ-oxygen bridges

Abstract

The present redetermination of the crystal structure of the title compound agrees well with a previous determination by Barnes etal., which it supplements by providing details of the hydrogen-bonding scheme. Scrutiny of the [Formula: see text] distances in homonuclear di-μ-oxygen M2O2 bridges in well over a hundred compounds shows that the lower limit for this distance is ~2.3 Å, and that the corresponding distance in the title compound, 2.44(1) Å, is closer to this limit than the [Formula: see text] distances in the majority of the compounds surveyed. Appreciably shorter nonbonded [Formula: see text] distances are found only in oxyanions, in particular those acting as bidentate ligands of metal atoms and thus forming heteronuclear di-μ-oxo bridges; an [Formula: see text] distance as short as ~2.0 Å has been reported and may constitute the limit of such nonbonded [Formula: see text] distances in general.