O. R. Evans, Wenbin Lin
Aug 4, 2001
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Chemistry of Materials
Abstract
Zinc(II) and cadmium(II) coordination networks with m-pyridinecarboxylate bridging ligands, Zn(nicotinate)2, 1, Cd(nicotinate)2, 2, Cd{3-[2-(4-pyridyl)ethenyl]benzoate}2, 3, Zn4{3-[2-(4-pyridyl)ethenyl]benzoate}8·{3-[2-(4-pyridyl)ethenyl]benzoic acid}·(H2O), 4, Zn{4-[2-(3-pyridyl)ethenyl]benzoate}2·H2O, 5, and Zn{5-[2-(3-pyridyl)ethenyl]thiophene-2-carboxylate}2, 6, have been synthesized under hydro(solvo)thermal conditions. With the exception of 5, these compounds adopt 2D grid structures. The use of unsymmetrical bent m-pyridinecarboxylate ligands leads to the formation of intrinsically acentric 2D grids which provide an interesting structural motif for the rational synthesis of polar solids. Compounds 1 and 3−5 are non-centrosymmetric and show significant powder second harmonic generation efficiencies. Compound 2 adopts a centrosymmetric structure due to the presence of a μ2,η3-carboxylate bridge, while compound 6 adopts a centrosymmetric structure due to the presence of 2-fold interpenetration. The pr...