Bis(3,5-dinitrobenzoato-κO)bis(ethane-1,2-diamine-κ² N,N′)cadmium(II)

Abstract

<jats:p>During systematic investigations of bioavailability and biological action enhancement of well known compounds with low bioactivity, a new mixed-ligand metal complex, [Cd(DNBA)<jats:sub>2</jats:sub>(en)<jats:sub>2</jats:sub>)] (DNBA = 3,5-dinitrobenzoate, C<jats:sub>7</jats:sub>H<jats:sub>3</jats:sub>N<jats:sub>2</jats:sub>O<jats:sub>6</jats:sub>; en = ethylendiamine, C<jats:sub>2</jats:sub>H<jats:sub>8</jats:sub>N<jats:sub>2</jats:sub>), has been synthesized. The complex molecules are located on inversion centers. Two DNBA anions monodentately coordinate the Cd<jats:sup>II</jats:sup> atom through an oxygen atom of the carboxylate group while two en molecules coordinate in a chelate fashion, resulting in a distorted O<jats:sub>2</jats:sub>N<jats:sub>4</jats:sub> coordination set. There is a weak intramolecular hydrogen bond of 3.099 (4) Å between the non-coordinating oxygen atom of the carboxylate group and one of the en amine groups. Three relatively weak intermolecular N—H...O hydrogen bonds associate complex molecules into sheets extending parallel to (0\overline{1}1), which are further stabilized by <jats:italic>π</jats:italic>–<jats:italic>π</jats:italic> interactions. A Hirshfeld surface analysis of the crystal structure indicates that the most important contributions to the crystal packing are from H...O/O...H (50.2%) and H...H (21.1%) interactions.</jats:p>