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Dalton Transactions

The international journal for inorganic, organometallic and bioinorganic chemistry



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Dalton Trans., 2009, 9837 - 9842, DOI: 10.1039/b914583d

Homochiral zinc phosphonates with layered and open framework structures using polycarboxylate as second linkers

Xun-Gao Liu, Jian Huang, Song-Song Bao, Yi-Zhi Li and Li-Min Zheng

Reactions of zinc sulfate and (R)- or (S)-(1-phenylethylamino)methylphosphonic acid (pempH2) in the presence of 1,4-benzenedicarboxylic acid (H2bdc) result in homochiral enantiomers (R)- and (S)-[Zn4(pempH)4(bdc)2]·2H2O ( 1). When H2bdc is replaced by 1,2,4,5-benzenetetracarboxylic acid (H4btec), enantiomers (R)- and (S)-[Zn3(pempH)2(btec)(H2O)2]·H2O ( 2) are obtained. Compounds 1 have a layer structure in which the chiral inorganic double chains, made up of corner-sharing {ZnO4} and {PO3C} tetrahedra, are connected by bdc2-. While in compounds 2, chiral chains of zinc phosphonate are each connected to their four equivalent neighbors through btec4- linkages, resulting in an open framework structure. All these compounds are optically active, exhibiting second harmonic generation (SHG) responses 0.2 or 0.8 times that of urea.

Graphical abstract image for this article (ID: b914583d)