Isolation of a monomeric hybrid zinc phosphate and its one-dimensional relative

Two hybrid zinc phosphates, [Zn(phen)]2(H1.5PO4)2(H2PO4)(1) and [Zn(phen)]2(HPO4)(H2PO4)2·xH2O (x(almost equal)0.5)(2), have been synthesized under hydrothermal conditions in the presence of 1,10-phenanthroline (phen) ligands. They are the first members in the zinc-phosphate-phen system. The structure of 1 consists of two ZnO3N2 trigonal bipyramids bridged by three P-centered tetrahedra. 1 is novel in the sense that it provides the first example of a monomeric zinc phosphate crystallized in a noncentrosynmmetric space group. The one-dimensional structure of 2 consists of a network of strictly alternating ZnO3N2 trigonal bipyramids, HPO4 and H2PO4 tetrahedra by sharing vertices. Interestingly, the chain-like structure of 2 can be generated from 1 by a shifting of Zn-O-P bonds.