Transition metal complexes with thiosemicarbazide-based ligands. XLIV. The supramolecular arrangement in the Ni(II) complexes of S-methylisothiosemicarbazide

The reaction of the octahedral complex [Ni(ITSC)2(NO3)2] (1) with sodium terephthalate yielded the novel octahedral complex [Ni(ITSC)2(H2O)2](tere) · 2H2O (2), (ITSC = S-methylisothiosemicarbazide, tere = terephthalate dianion). The X-ray structural analysis of the starting and the final compound showed that they have a centrosymmetric octahedral geometry with the NiN4O2 chromophore. As a result of the non-covalent intermolecular interactions, molecules of both complexes tend to associate into the characteristic 2D blocks separated by S-methyl moieties. In the case of 2, the terephthalate anions, located between the S-methyl groups, enable the transformation of the 2D into 3D supramolecular structure. The similar structural arrangement is also found in two previously published structures.