A compressed octahedral cobalt(II) complex in the crystal structure of diaqua[6,6′-sulfanediylbis(2,2′-bipyridine)]cobalt(II) dinitrate Li Guo-Ling

The asymmetric unit of the title salt, [Co(C20H14N4S)(H2O)2](NO3)2, comprises a [Co(C₂₀H₁₄N₄S)(H₂O)₂]²⁺ cation and two NO₃ ^- anions. In the complex, [Co(C₂₀H₁₄N₄S)(H₂O)₂]²⁺ cation, the tetradentate 6,6′-sulfanediylbis(2,2′-bipyridine) ligand coordinates to the Co^II cation in the equatorial positions, while two water molecules occupy the axial positions, forming a compressed octahedral CoN4O2 coordination sphere. The NO3 ^- anions are linked to the [Co(C₂₀H₁₄N₄S)(H₂O)₂]²⁺ cations via O-H·O hydrogen bonds, yielding a layered arrangement parallel to (001).