System-pH-dependent supramolecular isomers of puckered three-dimensional layered hydrogen-bonded networks: Syntheses, characterization and fluorescent properties
- Department of Chemistry, Nankai University, Tianjin 300071 (China)
Two true supramolecular isomers (1 and 2) formulated as [Zn(bipy)(H{sub 2}btc){sub 2}]{sub n} (bipy=2,2'-bipyridine, H{sub 3}btc=benzene-1,3,5-tricarboxylic acid) have been hydrothermally prepared through systematically changing the pH value of reaction mixture, and characterized by single-crystal X-ray diffraction, element analysis, infrared spectra (IR), and differential scanning calorimetry (DSC). Isomer 1 crystallizes in triclinic space group P-1, tetrahedral Zn(II) ions possess four-coordinated environment, while isomer 2 crystallizes in monoclinic space group C2/c and the distorted octahedral Zn(II) ions adopt six-coordinated fashion. 1 and 2 can be regarded as supramolecular structural isomers, the formation of which should be undoubtedly attributed to the preference for pH-dependent crystallization leading to multiple connectivity (monodentate and chelating bidentate) of organic ligand despite the same stoichiometry employed. The supramolecular chemistry, which organizes the coordination complexes into three-dimensional (3D) layered open structure, is driven by a combination of hydrogen-bond and {pi}-{pi} interactions. Moreover, 1 emits fluorescence at 350.1nm ({lambda}{sub ex}=310.0nm) and 2 exhibits fluorescent property at about 351.4nm ({lambda}{sub ex}=302.0nm)
- OSTI ID:
- 20905421
- Journal Information:
- Journal of Solid State Chemistry, Vol. 179, Issue 8; Other Information: DOI: 10.1016/j.jssc.2006.04.048; PII: S0022-4596(06)00265-9; Copyright (c) 2006 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved; Country of input: International Atomic Energy Agency (IAEA); ISSN 0022-4596
- Country of Publication:
- United States
- Language:
- English
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