Two-Dimensional Polyoxoniobates Constructed from Lindqvist-Type Hexaniobates Functionalized by Mixed Ligands
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- 作者：Jingyang Niu ; Xiao Fu ; Junwei Zhao ; Suzhi Li ; Pengtao Ma ; Jingping Wang
- 刊名：Crystal Growth & Design
- 出版年：2010
- 出版时间：July 7, 2010
- 年：2010
- 卷：10
- 期：7
- 页码：3110-3119
- 全文大小：1172K
- 年卷期：v.10,no.7(July 7, 2010)
- ISSN：1528-7505
文摘
By introducing mixed ligands into the hexaniobate system, three novel organic−inorganic hybrids, [Cu(en)2]2{[Cu(1,10-phen)][Cu(1,10-phen)(H2O)]Nb6O19}·10.5H2O (1), [Cu(en)2]2{[Cu(2,2′-bipy)][Cu(2,2′-bipy)(H2O)]Nb6O19}·9H2O (2) and [Cu(1,2-dap)2]2{[Cu(2,2′-bipy)][Cu(2,2′-bipy)(H2O)]Nb6O19}·11H2O (3) (en = ethylenediamine, 1,10-phen = 1,10-phenanthroline, 2,2′-bipy = 2,2′-bipydine, 1,2-dap = 1,2-diaminopropane), have been synthesized by the solution diffusion method and characterized by elemental analyses, IR spectra, UV spectroscopy, thermogravimetric analyses, and single-crystal X-ray diffraction. 1, 2, and 3 can be formularized as [Cu(L1)2]2{[Cu(L2)][Cu(L2)(H2O)]Nb6O19}·nH2O (L1 = en for 1 and 2, 1,2-dap for 3, L2 = 1,10-phen for 1, 2,2′-bipy for 2 and 3, n = 10.5 for 1, 9 for 2, 11 for 3), and all exhibit the two-dimensional (2D) network architecture built by [Cu(L1)2]2{[Cu(L2)][Cu(L2)(H2O)]Nb6O19} units and [Cu(L1)2]2+ bridges. 1−3 represent the first 2D architecture with (4,4)-connected topology in polyoxoniobate chemistry. Furthermore, the photoluminescent properties of 1 and 2 have been studied. The magnetic behavior of 1 has been quantitatively investigated and suggests the weak antiferromagnetic exchange interactions.