Encapsulation of halocadmate anion via hydrogen bonding: synthesis and characterization of bis(diethylenetriamine)cobalt(III) complex containing hexabromocadmate anion.

In this work, the encapsulation of [CdBr 6 ] 4- by six cations, [Co(dien) 2 ] 3+ has been described with the help of single crystal X-ray structural study in the complex, mer -[Co(dien) 2 ] 2 [CdBr 6 ]Br 2 . The complex anion, [CdBr 6 ] 4- has been obtained through solution method while attempting to synthesize complex dianion, [CdBr 4 ] 2- . This newly synthesized complex has been initially characterized by elemental analyses and spectroscopic studies (IR, NMR and UV-Visible). IR and NMR studies have been used for the isomeric identification of [Co(dien) 2 ] 3+ . Single crystal X-ray structure determination has revealed the presence of two complex cations, [Co(dien) 2 ] 3+ , one complex anion, [CdBr 6 ] 4- , and two Br - anions. The complex has crystallized in monoclinic crystal system with space group, P2 1 /n. The study of intermolecular interactions has confirmed the stability of crystal structure through N-H type H-bonding interactions besides electrostatic forces of attraction.