Metal–metal bonding in co-ordination complexes. Part V. The crystal structure of trimethyltin-pentacarbonylmanganese

Abstract

A three-dimensional X-ray study has been made of the crystal structure of trimethyltin-pentacarbonylmanganese. Crystals are monoclinic, a= 7·018 ± 0·009, b= 13·389 ± 0·017, c= 14·662 ± 0·020 Å, β= 114° 30′± 3′; space group P2₁/n, Z= 4. The analysis was based on 1385 reflections measured. The heavy atom method was used and the structural parameters refined to a final R of 0·044.

Exclusive of the hydrogen atoms, whose positions have not been determined, the molecule has almost mirror symmetry, the SnC₃ and MnC₅ moieties being rotated about the Sn–Mn bond out of such a configuration by about 1°.

The Sn–Mn bond has an uncorrected centre-to-centre distance of 2·674 Å, the same as in the triphenyl analogue. Mn–C distances range from 1·758–1·848, C–O 1·116–1·185, and Sn–C 2·058, 2·162, and 2·170 Å. Sn–Mn–C angles lie between 82·4 and 85·9° for the equatorial groups, 178° for the apical group. Mn–Sn–C angles are between 111·1 and 112·2° while C–Sn–C angles are from 106·9 to 107·6°.

Intermolecular contacts are of normal van der Waals type, the shortest approach, between oxygen atoms, being 3·21 Å.