Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1410349 | Journal of Molecular Structure | 2009 | 6 Pages |
Abstract
Two novel Keggin polyoxometalate compounds, [Cu2(PCA)4(H2O)2][SiW12O40]·8H2O (1) and [Cu(PCA)2(H2O)4][Cu(PCA)3(H2O)][SiW12O40]·H2O (2) (PCA = pyridine-4-carboxylic acid), were synthesized by in situ generation of pyridine-4-carboxylic acid ligand from 1,3-bis(4-pyridyl)propane precursor under hydrothermal conditions. Compounds 1 and 2 were structurally characterized by elemental analysis, IR and UV spectrography, TGA and single-crystal X-ray diffraction analysis. The variable-temperature magnetic susceptibility was measured at 2-300 K for 1. The compound 1 consists of polyoxoanions [α-SiW12O40]4â, dimer cations [Cu2(PCA)4(H2O)2]4+ and lattice water molecules. The water molecules link [α-SiW12O40]4â and [Cu2(PCA)4(H2O)2]4+ into three-dimensional (3D) architecture via hydrogen bonds. Polyoxoanions of 2 are linked into 1D chains through hydrogen bonds. Moreover, 1D chains are further extended into 3D supramolecular networks by hydrogen bonds and ÏÂ·Â·Â·Ï stacking interactions of pyridine-4-carboxylic acid molecules. The variable-temperature magnetic measurement of 1 shows an antiferromagnetic interaction in the 2-300 K temperature range.
Related Topics
Physical Sciences and Engineering
Chemistry
Organic Chemistry
Authors
Jia Li, Ya-Guang Chen, Chun-Jing Zhang, Qing-Jiao Kong,