System-pH-dependent supramolecular isomers of puckered three-dimensional layered hydrogen-bonded networks: Syntheses, characterization and fluorescent properties

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Abstract

Two true supramolecular isomers (1 and 2) formulated as [Zn(bipy)(H2btc)2]n (bipy=2,2′-bipyridine, H3btc=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(ΙΙ) 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 π-π interactions. Moreover, 1 emits fluorescence at 350.1 nm (λex = 310.0 nm) and 2 exhibits fluorescent property at about 351.4 nm (λex = 302.0 nm). © 2006 Elsevier Inc. All rights reserved.

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Chen, P. K., Che, Y. X., Li, Y. M., & Zheng, J. M. (2006). System-pH-dependent supramolecular isomers of puckered three-dimensional layered hydrogen-bonded networks: Syntheses, characterization and fluorescent properties. Journal of Solid State Chemistry, 179(8), 2656–2662. https://doi.org/10.1016/j.jssc.2006.04.048

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