کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1410349 | 1501867 | 2009 | 6 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Three-dimensional supramolecular networks constructed from Keggin anions and metal-organic complex with unpredicted oxidation of an N-heterocycle ligand
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی آلی
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چکیده انگلیسی
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.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Molecular Structure - Volume 921, Issues 1â3, 17 March 2009, Pages 233-238
Journal: Journal of Molecular Structure - Volume 921, Issues 1â3, 17 March 2009, Pages 233-238
نویسندگان
Jia Li, Ya-Guang Chen, Chun-Jing Zhang, Qing-Jiao Kong,