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Rhodium(III) complexes of 1-Alkyl-2-{(o-thioalkyl) phenylazo}imidazoles: synthesis, structure, spectral characterization, DNA binding study and DFT calculation

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Abstract

The Rh(III) complexes of 1-alkyl-2-{(o-thioalkyl)phenylazo}imidazole (SRaaiNR′, 1; R = R′= Me (a); R = Me, R′= Et (b); R = Et, R′= Me (c); R = R′= Et (d)), [Rh(SRaaiNR′)(PPh3)Cl2](ClO4) (2) have been synthesized. The complexes have been characterized by physicochemical and spectroscopic methods. The single-crystal X-ray diffraction study authenticates the structure of [Rh(SMeaaiNEt)(PPh3)Cl2](ClO4) (2b). The DNA binding ability of the complexes has been investigated by electronic absorption and fluorescence spectroscopic methods. Density functional theory computation technique has been used to enlighten the electronic structures and their spectral properties.

Graphic abstract

1-Alkyl-2-{(o-thioalkyl)phenylazo}imidazole complexes of Rh(III), [Rh(SRaaiNR′)(PPh3)Cl2](ClO4)](2) are synthesized and characterized. [Rh(SMeaaiNEt)(PPh3)Cl2](ClO4) (2b) is characterized by single-crystal X-ray diffraction study. Ligand acts as tridentate N(imidazole), N(azo) and S(thioether) donor centers. The DNA binding ability of the complexes is investigated by electronic absorption and fluorescence spectroscopic methods. The electronic structure and observed electronic transitions are interpreted by DFT and TDDFT computation.

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Acknowledgements

Financial support from the University Grant Commission (Reference No. F.: PSW-044/14-15 (ERO)), New Delhi, is gratefully acknowledged. Author P. Datta is thankful to TEQIP Phase-II, RCC Institute of Information Technology for financial support. We are also thankful to Dr. Suvendu Maity, D. S. Kothari Post Doctoral Fellow, Jadavpur University, for his support in X-ray structure analysis.

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Authors and Affiliations

  1. Department of Chemistry, Dinabandhu Andrews College, Garia, Kolkata, 700084, India

    Dibakar Sardar

  2. Department of Applied Science, RCC Institute of Information Technology, Canal South Road, Kolkata, 700015, India

    Papia Datta

  3. Department of Chemistry, Jadavpur University, Kolkata, 700032, India

    Chittaranjan Sinha

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  1. Dibakar Sardar
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  2. Papia Datta
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11243_2020_414_MOESM1_ESM.doc

Supplementary material includes the experimental section, energy and composition of the selected frontier molecular orbitals calculated by the DFT, electronic transition data from the TDDFT calculation, 1H NMR and IR spectra, and some figures related to the DNA binding study (DOC 12557 kb)

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Sardar, D., Datta, P. & Sinha, C. Rhodium(III) complexes of 1-Alkyl-2-{(o-thioalkyl) phenylazo}imidazoles: synthesis, structure, spectral characterization, DNA binding study and DFT calculation. Transit Met Chem 45, 595–603 (2020). https://doi.org/10.1007/s11243-020-00414-8

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  • DOI: https://doi.org/10.1007/s11243-020-00414-8

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