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Blue-Green Luminescent Rhenium(I) Tricarbonyl Complexes with Pyridine-Functionalized N-Heterocyclic Carbene Ligands

By Xiao-Wei Li (168007), Hong-Yan Li (1605790), Gao-Feng Wang (2079625), Fei Chen (13690), Yi-Zhi Li (1693768), Xue-Tai Chen (1755898), You-Xuan Zheng (1694860) and Zi-Ling Xue (1414108)


Five rhenium­(I) tricarbonyl chloride complexes with pyridine-functionalized N-heterocyclic carbenes, Re­(CO)<sub>3</sub>(L)Cl (L = 3-methyl-1-(2-pyridyl)­imidazol-2-ylidene (<b>1</b>), 3-methyl-1-(2-picolyl)­imidazol-2-ylidene (<b>2</b>), 3-methyl-1-(2-pyridyl)­benzimidazolin-2-ylidene (<b>3</b>), 3-methyl-1-(2-picoyl)­benzimidazolin-2-ylidene (<b>4</b>), 1-methyl-4-(2-pyridyl)-1,2,4-triazoline-5-ylidene (<b>5</b>)), have been synthesized by silver carbene transmetalation and characterized by elemental analysis, <sup>1</sup>H NMR, <sup>13</sup>C NMR, and IR spectra. The molecular structures of <b>3</b>–<b>5</b> have been determined by single-crystal X-ray diffraction. The electrochemical and photophysical properties of complexes <b>1</b>, <b>3</b>, and <b>5</b> have been studied. In both degassed CH<sub>2</sub>Cl<sub>2</sub> solution and the solid state at room temperature or 77 K, the emission wavelengths (465–511 nm) of complexes <b>1</b>, <b>3</b>, and <b>5</b> lie in the blue-green region, which are rare in contrast to the reported rhenium­(I) tricarbonyl complexes. The photoluminescence lifetime decays of Re­(I) complexes <b>1</b>, <b>3</b>, and <b>5</b> were measured, and the quantum yields were calculated by using the standard sample ([Ru­(bpy)<sub>3</sub>]<sup>2+</sup>(Cl<sup>–</sup>)<sub>2</sub> in degassed acetonitrile solution; Φ<sub>std</sub> = 0.094)

Topics: Biophysics, Biochemistry, Medicine, Genetics, Molecular Biology, Biotechnology, Developmental Biology, Cancer, Chemical Sciences not elsewhere classified, Physical Sciences not elsewhere classified, Φ std, Re, methyl, CH 2Cl solution, photophysical properties, acetonitrile solution, 1 H NMR, IR spectra, tricarbonyl, quantum yields, rhenium, silver carbene transmetalation, photoluminescence lifetime, 13 C NMR, complex, 77 K, room temperature
Year: 2012
DOI identifier: 10.1021/om2006408.s001
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Provided by: FigShare
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