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In situ syntheses of two viologen(4,4′-bipyridinium)-based cadmium compounds: structures, fluorescence and theoretical investigations

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Abstract

Two viologen(4,4′-bipyridinium)-based cadmium compounds (MQ)(CdI4) (1) and (EQ)(CdI4) (2) (MQ = CH3-4,4′-H2bipy-CH3, EQ = CH3CH2-4,4′-H2bipy-CH2CH3, bipy = bipyridine), in which the MQ and EQ were generated in situ, have been prepared via solvothermal reactions and structurally characterized by single-crystal X-ray diffraction. Both compounds are characteristic of an isolated (0D) structure with the cadmium ions coordinating to four iodine atoms to form a slightly distorted tetrahedron. In compound 1, the MQ cations and CdI4 2− anions link to each other through abundant hydrogen-bonding interactions to construct a 2D supramolecular layer, while compound 2 still exhibits 0D structure because it has only two hydrogen-bonding interactions. Photoluminescent studies reveal that both compounds display an emission in the green region. Theoretical study reveals that the emissions can be ascribable to metal-to-ligand charge transfer (MLCT) and ligand-to-metal charge transfer (LMCT) for 1 and 2, respectively. The spectral data of FT-IR are also reported in this work.

Graphical abstract

Two viologen-based cadmium compounds with the MQ and EQ generated in situ have been synthesized by solvothermal reactions. Both compounds display broad and strong photoluminescent emission bands in the green region. Theoretical investigation reveals that the emissions are attributed to MLCT and LMCT, respectively.

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Acknowledgments

We thank the financial support of the NSF of China (21361013), the NSF of Jiangxi Province (20132BAB203010, 20114BAB203028), the open foundation (No. 20130014) of the State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, and the science and technology project of Jiangxi Provincial Department of Education (GJJ13555).

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Authors and Affiliations

  1. Jiangxi Province Key Laboratory of Coordination Chemistry, Institute of Applied Chemistry, School of Chemistry and Chemical Engineering, Jinggangshan University, Ji’an, 343009, Jiangxi, China

    Wen-Tong Chen, Rong-Hua Hu, Yin-Feng Wang & Xian Zhang

  2. State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, 350002, Fujian, China

    Wen-Tong Chen & Juan Liu

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  1. Wen-Tong Chen
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  2. Rong-Hua Hu
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Correspondence to Wen-Tong Chen.

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Chen, WT., Hu, RH., Wang, YF. et al. In situ syntheses of two viologen(4,4′-bipyridinium)-based cadmium compounds: structures, fluorescence and theoretical investigations. J IRAN CHEM SOC 11, 1649–1657 (2014). https://doi.org/10.1007/s13738-014-0436-4

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