Isolation of a new bromocadmate(II) anion stabilized by second sphere coordination: [Co(NH3)6]2[Cd3Br10(H2O)2]Br2·2H2O

Utility of second sphere interactions for the isolation of a new polycadmate(II) anion is demonstrated through the synthesis of [Co(NH3)6]2[Cd3Br10(H2O)2]Br2·2H2O. The anion is stabilized through the unison of large number of N–H⋯Br second sphere interactions. The packing analysis delineates that the polycadmate(II) anion is not discrete but form polymeric ribbons of repeated formula, [Cd3Br10(H2O)2]4− that run along a axis of the unit cell. The complex cations, bromide ions and lattice water molecules are between and in the offsets between the corrugated anion ribbons. The study also advances the cooperative role of second sphere interactions amid electrostatic forces that stabilize the crystal lattice.