n-Butyl­dichlorido(2-{(1E)-1-[2-(pyridin-2-yl)hydrazin-1-yl­idene]eth­yl}phenolato)tin(IV)

Two independent mol­ecules comprise the asymmetric unit of the title compound, [Sn(C(4)H(9))(C(13)H(12)N(3)O)Cl(2)]. The Sn atom in each is coordinated by the tridentate ligand via the phenoxide O, hydrazine N and pyridyl N atoms, forming five- and six-membered chelate rings. The approximately octa­hedral coordination geometry is completed by the α-C atom of the n-butyl group (which is trans to the hydrazine N atom) and two mutually trans Cl atoms. Differences between the mol­ecules are evident in the relative planarity of the chelate rings and in the conformations of the n-butyl groups [C—C—C—C = 177.2 (5) and −64.4 (11)°]. Significant differences in the Sn—Cl bond lengths are related to the formation of N—H⋯Cl hydrogen bonds, which link the mol­ecules comprising the asymmetric unit into dimeric aggregates. These are consolidated in the crystal packing by C—H⋯Cl contacts. The structure was refined as an inversion twin; the minor twin component is 37 (3)%.