Diaquabis(1,3-propanediamine)nickel(II) squarate tetrahydrate

Abstract

The asymmetric unit of the title compound, [Ni(C(3)H(10)N(2))(2)(H(2)O)(2)](C(4)O(4))center dot 4H(2)O, contains one-half of the diaquabis(1,3-propanediamine) nickel(II) cation, one-half of the centrosymmetric squarate anion and two uncoordinated water molecules. In the cation, the Ni(II) atom is located on a crystallographic inversion centre and has a slightly distorted octahedral coordination geometry. The six-membered chelate ring adopts a chair conformation. O-H center dot center dot center dot O hydrogen bonds link the cation and anion through the water molecule, while N-H center dot center dot center dot O hydrogen bonds link the cation and anion and cation and water molecules. In the crystal structure, intermolecular O-H center dot center dot center dot O and N-H center dot center dot center dot O hydrogen bonds link the molecules into a three-dimensional network structure.