Some complexes derived from zinc salicylate or 3,5-di-tert-butylsalicylate. The crystal structure of (2,2′-bipyridyl)(methanol)( O-salicylato)( O,O′-salicylato)zinc

Abstract

The aqua ligands of diaquabis(salicylato)zinc and diaquabis(3,5-di-tert-butylsalicylato)zinc are easily displaced generating related bis-pyridine and 2,2′-bipyridyl complexes. Attempts to recrystallise the tert-butylsalicylate from ethanol resulted in replacement of the aqua ligands by ethanol ligands. The attempted recrystallisation of (2,2′-bipyridyl)bis(salicylato)zinc from methanol led to the isolation of octahedral [Zn(O 2CC 6H 4OH-2) 2(bipy)(MeOH)] in which one salicylato ligand is coordinated in a monodentate fashion and the other in a bidentate chelating manner, both coordination modes involving carboxylate rather than hydroxyl oxygen coordination. The methanol is strongly bonded trans to a nitrogen of the chelating 2,2′-bipyridyl and three further intramolecular six-membered hydrogen bonded rings are present, generated from interactions between the carboxyl and hydroxyl groups of the salicylate ligands and the hydroxyl group of the methanol ligand.