Mono- and dinuclear rhenium(I) compounds with bidentate benzimidazole chelators |
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| Affiliation: | 1. Department of Chemistry, Bannari Amman Institute of Technology, Sathyamangalam - 638 401, India;2. Research Department of Chemistry, Aditanar College of Arts and Science, Tiruchendur – 628 216, India;3. Institute of Chemistry, Academia Sinica, Taipei 115, Taiwan;4. Department of Inorganic and Physical Chemistry, Indian Institute of Science, Bangalore – 560 012, India;5. Postgraduate and Research Department of Chemistry, Vivekananda College, Tiruvedagam West, – 625 234 Madurai, India;1. Department of Chemistry, Rayalaseema University, Kurnool, India;2. GVK Biosciences PVT Ltd., Hyderabad, India |
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| Abstract: | A mononuclear rhenium(I) complex, fac-Re(CO)3(bzch)Cl] (1), where bzch = 2-benzimidazole-4H-chromen-4-one, was isolated from the equimolar reaction between the Schiff base ligand 2-(2-aminophenyliminomethyl)-4H-chromen-4-one (H2pch) and Re(CO)5Cl]. The 1:2 molar ratio reactions between Re(CO)5Cl] and N-(2-hydroxybenzylidene)-benzimidazole (Hbzp) afforded a dinuclear rhenium(I) compound, (μ-bzp)2Re(CO)3]2 (2). These new rhenium(I) compounds were characterized by NMR, UV–vis, IR, and emission spectroscopy, as well as conductance measurements and single crystal X-ray diffraction. The emission spectra for 1 in dichloromethane were well-resolved and could be deconvoluted into three main bands. The emission spectra for 2 were red-shifted by > 140 nm and markedly broadened relative to those of 1. |
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