Crystal structure of poly[bis­(ammonium) [bis­(μ(4)-benzene-1,3,5-tri­carboxyl­ato)dizincate] 1-methyl­pyrrolidin-2-one disolvate]

The title three-dimensional metal–organic framework (MOF) compound, {(NH(4))(2)[Zn(2)(C(9)H(3)O(6))(2)]·2C(5)H(9)NO}(n), features an anionic framework constructed from Zn(2+) cations and benzene-1,3,5-tri­carboxyl­ate (BTC) organic anions. Charge balance is achieved by outer sphere ammonium cations formed by degradation of di-n-butyl­amine in the solvothermal synthesis of the compound. Binuclear {Zn(2)(COO)(2)} entities act as the framework’s secondary building units. Each Zn(II) atom has a tetrahedral coordination environment with an O(4) set of donor atoms. The three-dimensional framework adopts a rutile-type topology and channels are filled in an alternating fashion with ordered and disordered 1-methyl­pyrrolidin-2-one solvent mol­ecules and ammonium cations. The latter are held in the channels via four N—H⋯O hydrogen bonds, including three with the benzene-1,3,5-tri­carboxyl­ate ligands of the anionic framework and one with a 1-methyl­pyrrolidin-2-one solvent mol­ecule.