Heptaaqua(4-nitrobenzoato-κ2O,O′)strontium(II) 4-nitrobenzoate dihydrate

Abstract

The title compound, [Sr(C7H4NO4)(H2O)7](C7H4NO4)·2H2O, was synthesized from the aqueous reaction of strontium carbonate with 4-nitro­benzoic acid. The structure consists of a nine-coordinate hepta­aqua­(4-nitro­benzoato-κ2O,O′)strontium(II) complex cation, an uncoordinated 4-nitro­benzoate anion and two solvent water mol­ecules. The cations, anions and solvent water mol­ecules are linked with the aid of several O—H⋯O and C—H⋯O inter­actions, resulting in a three-dimensional hydrogen-bonding network. The hydrogen bonding between a solvent water mol­ecule and a symmetry-related solvent water mol­ecule results in the formation of a water dimer.