Abstract
Two novel zinc phosphonates, namely Zn2Li2(OOCC6H4PO3)2 (1) and Zn2(OOCC6H4PO3)F (2) were hydrothermally synthesized by reacting zinc sulfate with 4-carboxyphenylphosphonic acid in the presence of additional LiF. Both display pillared layered structures, but with different layer topologies. In compound 1, {ZnO4} and {LiO4} tetrahedra are connected by {CPO3} tetrahedra via corner-sharing, forming an inorganic net-like layer containing 3-membered rings. In compound 2, the fluoride anion serves as a µ3-bridging ligand coordinating to three Zn atoms. The inorganic layer consists of chain (I) made up of edge-sharing {ZnO3F2} and chain (II) made up of edge-shared dimers of {ZnO4F} and O–P–O units, which are fused together in an alternative way. The organic groups of 4-carboxyphenylphosphonate ligands fill in the interlayer spaces in both cases.
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