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-κ 2 N , N ′)bis(benzene-1,2-diamine-κ N )cadmium(II) naphthalene-1,5-disulfonate, [Cd(C 6 H 8 N 2 ) 4 ](C 10 H 6 O 6 S 2 ), was synthesized. The complex salt crystallizes in the monoclinic space group C 2/ 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.