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-κ(2) N (1),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(C(12)H(14)N(3)S)(2)]·C(3)H(7)NO. The ligands act as monoanionic κ(2) N (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⋯Ni trans-inter­actions are observed [H⋯Ni distances are 2.50 and 2.57 Å] and thus anagostic inter­actions can be suggested. The Hirshfeld surface analysis indicates that the major contributions for the crystal packing are H⋯H (66.6%), H⋯S (12.3%) and H⋯C (10.9%) inter­actions. In the crystal, the complex mol­ecules are linked by di­methyl­formamide solvent mol­ecules through N—H⋯O inter­actions into one-dimensional hydrogen-bonded polymers along [010].