Luminescent monomeric and polymeric cuprous halide complexes with 1,2-bis(3,5-dimethylpyrazol-1-ylmethyl)-benzene as ligand |
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| Affiliation: | 1. Key Laboratory for Green Chemical Process of the Ministry of Education, Wuhan Institute of Technology, Wuhan, PR China;2. Department of Chemistry and Institute of Advanced Materials, Hong Kong Baptist University, Waterloo Road, Hong Kong, PR China;3. School of Pharmaceutical and Chemical Engineering, Taizhou University, Taizhou, PR China;4. Institute of Applied Chemistry, Shanxi University, Taiyuan, PR China;1. Department of Crystallography, Institute of Chemistry, University of Silesia, 9th Szkolna St., 40-006 Katowice, Poland;2. Faculty of Chemistry, Wroclaw University, F. Joliot-Curie 14 St., 50-383 Wrocław, Poland |
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| Abstract: | Reaction of cuprous bromide with equimolar amounts of 1,2-bis(3,5-dimethylpyrazol-1-ylmethyl)-benzene (dpb) affords a mononuclear three-coordinated complex CuBr(dpb)] (F2) with dpb acting as a chelating ligand. In contrast, using cuprous iodide instead under the same conditions gives the polymeric compound Cu2I2(dpb)]n (F1) which contains double-bridging iodine atoms. The complexes were characterized by element analysis and 1H NMR spectroscopy, and the crystal structures were determined by single-crystal X-ray diffraction methods. The Cu(I) complexes are luminescent in the solid state at ambient temperature. Intense orange emission for complex F1 is observed, with maxima at 593 nm, probably ascribed to a combination of a halide-to-metal charge transfer and copper-centered d → s, p transitions. F2 exhibits a blue photoluminescence, with emission maximum at 515 nm, assigned to metal-to-ligand charge-transfer excited states, probably mixed with some halide-to-ligand characters. |
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