"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.

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