A new example of intramolecular C-H•••Ni anagostic interactions: synthesis, crystal structure and Hirshfeld analysis of cis-bis[4-methyl-2-(1,2,3,4-tetrahydronaphthalen-1-ylidene)hydrazinecarbothioamidato-κ2N1,S]nickel(II) dimethylformamide monosolvate

The reaction of Ni-II acetate tetrahydrate with 4-methyl-2-(1,2,3,4-tetrahydronaphthalen- 1-ylidene)hydrazinecarbothioamide in a 2: 1 molar ratio and recrystallization from dimethylformamide yielded the title compound, [Ni(C12H14N3S)(2)]center dot C3H7NO. The ligands act as monoanionic kappa N-2(1),S-donors, forming five-membered metallarings. The Ni-II ion is fourfold coordinated in a distorted square-planar cis-configuration, which is rather uncommon for monothiosemicarbazone complexes. Intramolecular H center dot center dot center dot Ni trans-interactions are observed [H center dot center dot center dot Ni distances are 2.50 and 2.57 angstrom] and thus anagostic interactions can be suggested. The Hirshfeld surface analysis indicates that the major contributions for the crystal packing are H center dot center dot center dot H (66.6%), H center dot center dot center dot S (12.3%) and H center dot center dot center dot C (10.9%) interactions. In the crystal, the complex molecules are linked by dimethylformamide solvent molecules through N-H center dot center dot center dot O interactions into one-dimensional hydrogen-bonded polymers along [010].