Two coordination compounds of SnCl2 with 4-methylpyridine N-oxide

Abstract

{In the solid-state structures of catena-poly[[}dichloridotin(II)]-mu(2)-(4-methyl-pyridine N-oxide)-kappa O-2:O], [SnCl2(C6H7NO)](n), 1, and dichloridobis(4-methyl-pyridine N-oxide-kappa O)tin(II), [SnCl2(C6H7NO)(2)], 2, the bivalent tin atoms reveal a seesaw coordination with both chlorine atoms in equatorial and the Lewis base molecules in axial positions. While the Sn-Cl distances are almost identical, the Sn-O distances vary significantly as a result of the different bonding modes (mu(2) for 1, mu(1) for 2) of the 4-methylpyridin-N-oxide molecules, giving rise to a one-dimensional coordination polymer for the 1:1 adduct, 1, and a molecular structure for the 1:2 adduct, 2. The different coordination modes also influence the bonding parameters within the almost planar ligand molecules, mostly expressed in N-O-bond lengthening and endocyclic bond-angle widening at the nitrogen atoms. Additional supramolecular features are found in the crystal structure of 2 as two adjacent molecules form dimers via additional, weak O center dot center dot center dot Sn interactions.}