Six-coordinate vanadyl tetradentate Schiff base complexes with methanol, methoxide, water or fluoride as the sixth ligand

The reaction of [VIVO(L)] (where L is a tetradentate dianion derived from a Schiff base H2L) with acids and air generates the species [VVO(L)]+. These were shown earlier to be stable and to form adducts with the original VIV material. We show here how a limited range of bases including MeOH, OMe−, F−, and even H2O can also form adducts with the VV cation. The crystal structures of six such adducts are described, namely [VO(hapen)(MeOH)](ClO4), [VO{salen(5-Me)2}(MeOH)](ClO4), [VO{salen(5-Cl)2}(MeOH)](ClO4), [VO(salibn)(H2O)](CF3SO3), [{VO{salen(5-Cl)2}}2(μ-F)][BF4] and [{VO{salen(5-Br)2}}2(μ-F)][BF4].