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We report here the synthesis of a metal-organic framework comprising an organic cage linker with covalently prefabricated, intrinsic porosity. The network can be compared to a porous rock salt structure where the pores are partially filled by charge-balancing cations.

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The title compound, poly[zinc(II)-mu-butane-1,4-diamine-mu-(hydrogen phosphito)] (C(4)H(12)N(2))(0.5)[ZnHPO(3)], is a hybrid organic-inorganic solid built up from 1,4-diaminobutane molecules, Zn(2+) cations (coordinated by three O atoms and one N atom) and HPO(3)(2-) hydrogen phosphite groups. The organic species bonds to the Zn atom as an unprotonated ligand, resulting in it acting as a bridge between infinite ZnHPO(3) layers, which propagate in (100). The complete butane-1,4-diamine species is generated from a H(2)N(CH(2))(2)- half molecule by inversion symmetry. The zincophosphite sheets contain polyhedral four- and eight-membered rings in a 4.8(2) topology.