A 'Butterfly'-shaped Water Tetramer in a Cu4Complex Supported by a Hydrazone Ligand: Synthesis, Crystal Structure, Magnetic Properties, and Quantum Chemical Study.

A potentially tetradentate NOOO donor hydrazone ligand, LH2(condensation product of benzhydrazide with O-vanillin) generates a tetranuclear CuIIcomplex [Cu4(L)4]·4H2O (1), whose void spaces are occupied by water tetramers presenting a ‘butterfly' conformation with the highest dihedral angle reported to date, as revealed by its X-ray crystal structure. 1 has also been characterized using various spectroscopic techniques, including IR, UV-vis, and elemental analysis. Variable temperature magnetic susceptibility measurements reveal the presence of moderate antiferromagnetic intra-tetramer coupling between the four CuIIcentres connected through simple oxo groups of the hydrazone ligand with two different coupling constants (J1= –61.7(3) cm-1and J2= –92(1) cm-1) corresponding to the two different CuIItetramers identified in the X-ray structure. We also report a quantum chemical study (MP2(full)/6–311+G(3df,2p)//B3LYP/6–311+G(3df,2p)) to calculate the stability of the water tetramers. [ABSTRACT FROM AUTHOR]