Crystallisation solvent influence on the crystal structures of MnII and NiII complexes with 2,6-bis(1-salicyloylhydrazonoethyl)pyridine, H4daps

Neutral manganese and nickel complexes of the empirical formulae Mn(H(2)daps)(H2O)(0.5) and Ni(H(2)daps) (H2O)(1.5)(CH3CN) have been prepared by electrochemical syntheses. The structures of the complexes formed from solvents with different donor ability were investigated. Recrystallisation of Mn(H(2)daps)(H2O)(0.5) from pyridine and ethanol yields [Mn(H(2)daps)(py)(2)] 1 and [Mn(H(2)daps)(C2H5OH) . (H2O)] 2. Slow evaporation of dichloromethane and methanol solutions of Ni(H(2)daps)(H2O)(1.5)(CH3CN) allows the isolation of single crystals of [Ni-2(H(2)daps)(2)] . CH2Cl2 4 and [Ni-2(H(2)daps)(2)(CH3OH)(2)] . 3 CH3OH . H2O 5, suitable for X-ray diffraction studies. Recrystallisation of 4 from pyridine yields [Ni-2(H(2)daps)(2)(pv)(2)] . CH2Cl2 6, previously characterised by us. This study shows the versatility of the H(4)daps ligand and the influence that the crystallisation solvent can have on the crystal structure of these complexes.