"cis"-Geometry and anagostic H...Ni interactions, very uncommon features for TSC complexes.
What is it about?
The reaction of NiII acetate tetrahydrate with the ligand 4-phenyl-2-(1,2,3,4-tetrahydronaphthalen-1-ylidene)hydrazinecarbothioamide in a 2:1 molar ratio yielded the title compound, [Ni(C16H16N3S)2]·2C4H8O·H2O. The deprotonated ligands act as N,S-donors, forming five-membered metallacycles with the metal ion exhibiting a cis coordination mode unusual for thiosemicarbazone complexes. The NiII ion is four-coordinated in a tetrahedrally distorted square-planar geometry. Trans-arranged anagostic C-H...Ni interactions are observed. In the crystal, the complex molecules are linked by water molecules through N-H...O and O-H...S hydrogen-bonding interactions into centrosymmetric dimers stacked along the c axis, forming rings of graph-set R44(12). Classical O-H...O hydrogen bonds involving the water and tetrahydrofuran solvent molecules as well as weak C-H...[pi] interactions are also present.