engleski

A tetra­nuclear cubane-like nickel(II) complex with a tridentate salicyl­­idene­imine Schiff base ligand: tetra­kis­[μ3-4-methyl-N-(2-oxidophen­ yl)salicylideneiminato]tetra­kis­[methano­ lnickel(II)] methanol 0.8-solvate

The tetra­nuclear title complex, [Ni4(C14H11NO2)4(CH3OH)4]·0.8CH3OH, has a distorted cubane topology shaped by four Schiff base ligands. The cubane [Ni4([mu]3-O4)] core is formed via the O atoms from the Schiff base ligands. The octa­hedrally coordinated NiII ions occupy alternating vertices of the cube. Each NiII ion is coordinated by one O, N, O'- tridentate dianionic ligand, two O atoms of oxidophenyl groups from adjacent ligands and the O atom of a coordinating methanol mol­ecule. The cubane core is stabilized via an intra­ molecular O-H...O hydrogen bond between the hy­ droxy group of the coordinating methanol mol­ ecules and the phenolate O atom of the aldehyde Schiff base fragment. Additional stabilization is obtained via intra­molecular C- H...O hydrogen bonds involving aromatic C-H groups and the oxygen atoms of adjacent methanol mol­ ecules. In the crystal, complex mol­ecules are linked into chains parallel to the c axis via weak C-H...O hydrogen bonds. The partial- occupancy disordered methanol solvent mol­ecule has a site occupancy of 0.8 and is linked to the tetra­nuclear unit via an inter­molecular C- H...O hydrogen bond involving a phenolate O atom.

crystal structure ; nickel cubane-like tetra­mers ; Schiff bases.

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