Diaquabis(1,3-Propanediamine)nickel(II) Squarate Tetrahydrate

Abstract

The asymmetric unit of the title compound, [Ni(C<inf>3</inf>H <inf>10</inf>N<inf>2</inf>)<inf>2</inf>-(H<inf>2</inf>O)<inf>2</inf>](C <inf>4</inf>O<inf>4</inf>)·4H<inf>2</inf>O, contains one-half of the diaqua-bis(1,3-propane-diamine)nickel(II) cation, one-half of the centrosymmetric squarate anion and two uncoordinated water mol-ecules. In the cation, the NiII atom is located on a crystallographic inversion centre and has a slightly distorted octa-hedral coordination geometry. The six-membered chelate ring adopts a chair conformation. O - H⋯O hydrogen bonds link the cation and anion through the water mol-ecule, while N - H⋯O hydrogen bonds link the cation and anion and cation and water mol-ecules. In the crystal structure, inter-molecular O - H⋯O and N - H⋯O hydrogen bonds link the mol-ecules into a three-dimensional network structure.