Transition-metal Schiff-base complexes as ligands in tin chemistry Part 6. Reactions of diorganotin(IV) dinitrates with M(3MeO-sal1,3pn) [M = Ni, Co or Zn; H 23MeO-sal1,3pn = N, N′-bis(3-methoxysalicylidene)-propane-1,3-diamine

Abstract

Reactions of diorganotin(IV) dinitrates with M(3MeO-sal1,3pn) · H 2O (M = Ni, Co or Zn; H 23MeO-sal1,3pn = N, N′-bis(3-methoxysalicylidene)propane-1,3-diamine) leads to nitrate migration from tin to the transition metal or zinc and the formation of intimate ion-paired bimetallic 1 1 addition complexes. In each of these complexes the tin atom is located in the plane of the Schiff-base oxygens and is coordinated by all four. The complexes [SnBz 2(NO 3)] · [M(3MeO-sal1,3pn)(NO 3)](M = Co or Zn) are isomorphous and each contains tin in a pentagonal bipyramidal environment with the four Schiff-base oxygens and a nitrate oxygen defining the equatorial plane. In the case of {[SnMe 2] · [Ni(3MeO-sal1,3pn)(NO 3)(H 2O)]}NO 3, the tin is six-coordinated, but there is an additional weak intermolecular SnO interaction involving an oxygen of a nitrate coordinated to nickel. The complex {[SnMe 2(H 2O)] · [Co(3MeO-sal1,3pn)(NO 3)(H 2O)]}NO 3 contains tin in a pentagonal bipyramidal environment with the Schiff-base oxygens and a water oxygen defining the equatorial plane. The crystal structures of both dimethyltin complexes display extensive hydrogen bonding.