Diaquabis(propane-1,2-diamine-N,N ')nickel(II) bis(p-toluenesulfonate)

The crystal structure of the title compound, [Ni(C3H10N2)(2) (H2O)(2)](C7H7 O3S)(2) or [Ni(H2O)(2) {NH2CH2CH(NH2)CH3}(2)](CH3C6H4SO3)(2), exhibits a la yered structure in which the complex cations and the p-toluenesulfonate ani ons form alternating layers. The central Ni-II atom of the cation resides o n a crystallographic inversion centre and has a slightly distorted octahedr al coordination composed of the water ligands bonding through oxygen in a t rans arrangement and the N,N'-bidentate propanediamine ligands. The p-tolue nesulfonate anions are arranged with the sulfonate groups turned alternatel y towards opposite sides of the layers. The structure of the layers is stab ilized by a network of hydrogen bonds between the sulfonate O atoms, water molecules and the propanediamine N atoms.