Synthesis of uranium complexes incorporating extended azo-imine ligands: Molecular and electronic structure |
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| Affiliation: | 1. Department of Chemistry, University of Kalyani, Kalyani, 741235, India;2. Department of Chemistry, East Calcutta Girls'' College, Kolkata, 700089, India;3. Department of Chemistry, University of Aveiro, 3810-193, Aveiro, Portugal |
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| Abstract: | The new azo-imine ligands 2,4-di-tert-butyl-6-((2-((2-hydroxyphenyl)diazenyl) phenylimino)methyl)phenol, H2L1, 1a, and 2,4-di-tert-butyl-6-((2-((2-hydroxyphenyl) diazenyl)p-chlorophenylimino)phenol, H2L2, 1b, were prepared. Reaction of H2L1;1a, and H2L2;1b, with uranyl nitrate hexahydrate afforded the mononuclear complexes of compositions [U(O)2(L1)(H2O)]; 2a, and [U(O)2(L2)(H2O)]; 2b, complexes respectively. The newly synthesised ligands (1a and 1b) and the complexes (2a and 2b) were characterised unequivocally. The x-ray structure of 2a was determined. The tetradentate dianionic ligand (L1)2- coordinated the uranium ion equatorially with a water molecule in the same plane. Two axially coordinated oxo ligands completed the overall pentagonal bipyramid geometry around U(VI) ion. Structural pattern, electron transfer properties (oxidation near 1.32 V vs Ag/AgCl) and electronic transitions of [U(O)2(L1)(H2O)]; 2a, and [U(O)2(L2)(H2O)]; 2b have been rationalized by DFT calculations. |
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| Keywords: | Tetradentate azoimine ligand Crystal structure Electrochemistry Theoretical study |
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