Crystal structure of bis(2-methyl-1H-imidazol-3-ium) dihydroxidobis(oxalato-kappa O-2(1),O-2)stannate(IV) monohydrate

In the structure of the hydrated title salt, (C4H7N2)(2)[Sn(C2O4)(2)(OH)(2)]center dot H2O, the asymmetric unit comprises one stannate(IV) dianion, two organic cations and one water molecule of crystallization. The [Sn(C2O4)(2)(OH)(2)](2-) dianion consists of an Sn-IV atom chelated by two oxalate anions and coordinated by two OH- ligands in a cis octahedral arrangement. Neighbouring anions are connected through O-H center dot center dot center dot O hydrogen bonds between hydroxide groups and non-coordinating oxalate O atoms into layers expanding parallel to (100). In addition, cations and anions are linked through N-H center dot center dot center dot O hydrogen bonds, and the water molecule bridges two anions with two O-H center dot center dot center dot O hydrogen bonds and is also the acceptor of an N-H center dot center dot center dot O hydrogen bond with one of the cations. Weak C-H center dot center dot O hydrogen bonds are also observed. The intricate hydrogen bonding leads to the formation of a three-dimensional network.