Selenious Acid as a Ligand: Molecular and Crystal Structure of [Co(H2O)2Cl2(H2SeO3)2]

Co(H₂O)₂Cl₂(H₂SeO₃)₂] (monoclinic, P2₁/c, Z = 2, a = 519.82(5), b = 1462.6(1), c = 643.09(7) pm, β = 92.51(1)°, R_all = 0.0583) was obtained from CoCl₂ and H₂SeO₃ as purple plate–shaped single crystals. In the compound, the Co²⁺ ions are octahedrally coordinated by two Cl^? ions, two H₂O molecules, and two monodentate H₂SeO₃ molecules, leading to neutral complexes Co(H₂O)₂Cl₂(H₂SeO₃)₂]. They are connected by hydrogen bonds involving both chlorine and oxygen atoms as acceptor atoms.