Synthesis, crystal structure and Hirshfeld surface analysis of a cadmium complex of naphthalene-1,5-disulfonate and o-phenylenediamine

A novel o-phenylenediamine (opda)-based cadmium complex, bis(benzene-1,2-diamine-κ2N,N′)bis(benzene-1,2-diamine-κN)cadmium(II) naphthalene-1,5-disulfonate, [Cd(C6H8N2)4](C10H6O6S2), was synthesized. The complex salt crystallizes in the monoclinic space group C2/c. The Cd atom occupies a special position and coordinates six nitrogen atoms from four o-phenylenediamine molecules, two as chelating ligands and two as monodentate ligands. The amino H atoms of opda interact with two O atoms of the naphthalene-1,5-disulfonate anions. The anions act as bridges between [Cd(opda)4]2+ cations, forming a two-dimensional network in the [010] and [001] directions. The Hirshfeld surface analysis shows that the primary factors contributing to the supramolecular interactions are short contacts, particularly van der Waals forces of the type H...H, O...H and C...H.