Journal
INORGANICA CHIMICA ACTA
Volume 522, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.ica.2021.120373
Keywords
Gold(III); Azoimidazoles; Heterocycles; Supramolecular polymers; Non-covalent interactions; Halogen-halogen interactions
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Funding
- Ministry of Education and Science of the Russian Federation [075-03-2020-223 (FSSF20200017)]
- RUDN University Strategic Academic Leadership Program
- Russian Foundation for Basic Research [20-53-00006]
- Belarusian Foundation for Fundamental Research [X20P066]
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Novel triarylazoimidazole trichlorogold(III) complexes were prepared and characterized in this study. Structural characterization revealed weak coordination of the azo group to the gold(III) center. Additionally, non-covalent chlorine---chlorine interactions were observed in the solid state.
Preparation of novel triarylazoimidazole trichlorogold(III) complexes is described. The new compounds were characterized using C, H, N elemental analyses, IR, UV/Vis and X-ray diffraction analysis. Structural characterization revealed that the distances N(imidazolic)???Au (2.030 ? (4) and 2.037 ? (5)) are significantly shorter than N(azo group)???Au (2.853 ? (4) and 2.899 ? (5)) indicating that the azo group is rather weakly coordinated at the Au(III) metal center. Thus, triarylazoimidazole trichlorogold(III) complexes could be described as square planar gold(III) complexes with weakly binding to the gold(III) center azogroup. Non-covalent chlorine???chlorine interactions were detected for 5 in the solid state and studied by DFT calculations and topological analysis of the electron density distribution within the framework of Bader?s theory (QTAIM method). Theoretical studies demonstrated that short non-covalent Cl???Cl interactions (3.202 ?) play crucial role in self-assembly of highvalent Au(III) chloride.
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