Two Three-Dimensional Lanthanide Frameworks Exhibiting Luminescence Increases upon Dehydration and Novel Water Layer Involving in Situ Decarboxylation
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Two three-dimensional polymeric Tb(III) and Yb(III) frameworks, namely, {[Tb3(Hptc)(ptc)(pdc)(H2O)6]·2H2O}n (1) and {[Yb2(ptc)(ox)(H2O)5]·7H2O}n (2) (H4ptc = pyridine-2,3,5,6-tetracarboxylic acid, H2pdc = pyridine-3,5-dicarboxylic acid, ox = oxalate), have been synthesized by a hydrothermal method and characterized by infrared spectra, elemental analysis, powder X-ray diffraction, thermogravimetric analysis, and single-crystal X-ray diffraction. Framework 1 shows an interesting three-dimensional (8,8)-connected net with a Schläfli symbol of (33·418·55·62)2(36·414·57·6), while 2 exhibits an unusual (4,8)-connected sqc21 net with a Schläfli symbol of (32·42·52)(34·48·512·64). Luminescence studies of 1 reveal that the luminescence intensity increases when the framework is dehydrated.
创建时间：
2016-02-17
