Syntheses, crystal structures, and luminescent properties of three zinc carboxyphosphonates with 2D layered and 3D pillared-layer structures

摘要

Three zinc(II) carboxyphosphonates [Zn-3(5-pmipe)(2)]center dot 0.5H(2)O (1.0.5H(2)O), [Zn-3(5-pmipm)(2)]center dot H2O (2 center dot H2O), and [Zn-3(5-pmipH)(2)(bpy)(0.5)]center dot 6H(2)O (3.6H(2)O) (5-pmipH4 = 5-(phosphonomethyl) isophthalic acid, 5-pmipeH(3) = [C6H3(CO2H)(CO2Et)(CH2PO3H2)], 5-pmipmH(3) = [C6H3(CO2H)(CO2Me)(CH2PO3H2)], bpy = 4,4'-bipyridine) were synthesized under hydrothermal conditions. Compounds 1 and 2 are isostructural. In compounds 1 and 2, the {ZnO4} and {CPO3} tetrahedra are interconnected into a zigzag infinite chain via corner-sharing. In addition, these chains are further linked by carboxyphosphonate ligands into a 2D layer. Interestingly, one carboxylate group experiences an in situ esterification reaction with ethanol and methanol, respectively. Compound 3 displays a 3D pillared-bilayer open framework structure. The {ZnO4}, {ZnO3N} and {CPO3} tetrahedra are interlinked through corner-sharing into one chain, which are joined together by 5-pmipH(3) into a bilayer. The layers are pillared up by bpy into 3D network. The luminescent properties of compounds 1-3 were investigated in solid state at room temperature. (C) 2015 Elsevier B.V. All rights reserved.