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Inorganic–organic hybrids assembled by flexible multidentate linker: design, structure and luminescence

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Abstract

Three coordination complexes, [Cu(L1)(2,2–bipy)]2n·3nH2O (1), [Cu(L1)(2,2–bipy)2]·xH2O (2: x = 3.5 and 3: x = 5), were synthesized by reactions of the flexible ligand 1,1´-methylenebis(5-methyl-pyrazole-4-carboxylic acid) (H2L1) and coligands 2,2'–bipyridyl (2,2-bipy) with Cu(OAc)2·H2O in different reaction condition, respectively. The structures of these complexes were established by elemental analysis, IR and single-crystal X-ray diffraction analysis. Complex 1 possessed a one-dimensional (1D) chainlike structure, (L1)2− group exhibited trans-configuration and coordinated to Cu(II) ions by carboxylate O atoms in µ2–k:O,O′; k:O′′′,O′′′ mode. In the similar subjectival structure of 2 and 3, (L1)2− anions also presented trans-configuration, but only one carboxylate group chelated to a Cu(II) ion, and the other carboxylate group remains free in a deprotonated form. The 1D chains in 1 were further assembled to a 3D supramolecular architecture via intermolecular C–H···O hydrogen bond. The mononuclear zwitterionic complexes 2 and 3 are further assembled into a 2D/3D supramolecular architecture by intermolecular hydrogen bonds and π···π interaction. The thermal and photoluminescent properties of 1–3 in the solid state have also been investigated.

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Acknowledgements

The project was supported by the National Natural Science Foundation of China (No. 21101018), Priority Academic Program Development of Jiangsu Higher Education Institutions (No. 13KJB150001), and the Natural Science Foundation of State Key Laboratory of Coordination Chemistry of Nanjing University.

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Authors and Affiliations

  1. School of Petrochemical Engineering, and Advanced Catalysis and Green Manufacturing Collaborative Innovation Center, Changzhou University, Changzhou, 213164, Jiangsu, People’s Republic of China

    Zheng Liu, Yujuan Wu, Yuting Zhao, Meiling Cheng & Qi Liu

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  1. Zheng Liu
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  2. Yujuan Wu
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  3. Yuting Zhao
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  4. Meiling Cheng
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  5. Qi Liu
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Correspondence to Meiling Cheng.

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Liu, Z., Wu, Y., Zhao, Y. et al. Inorganic–organic hybrids assembled by flexible multidentate linker: design, structure and luminescence. Transit Met Chem 46, 575–581 (2021). https://doi.org/10.1007/s11243-021-00475-3

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  • DOI: https://doi.org/10.1007/s11243-021-00475-3

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