期刊
CHEMISTRY-A EUROPEAN JOURNAL
卷 21, 期 3, 页码 1088-1095出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.201405316
关键词
BODIPY; carbon monoxide; fluorescence; ligand substitution; transition metals
资金
- TU Darmstadt
Several metal complexes with a boron dipyrromethene (BODIPY)-functionalized N-heterocyclic carbene (NHC) ligand 4 were synthesized. The fluorescence in [(4)(SIMes)RuCl2(ind)] complex is quenched (phi=0.003), it is weak in [(4)PdI2(Clpy)] (phi=0.033), and strong in [(4)AuI] (phi=0.70). The BODIPY-tagged complexes can experience pronounced changes in the brightness of the fluorophore upon ligand-exchange and ligand-dissociation reactions. Complexes [(4)MX(1,5-cyclooctadiene)] (M=Rh, Ir; X=Cl, I; phi=0.008-0.016) are converted into strongly fluorescent complexes [(4)MX(CO)(2)] (phi=0.53-0.70) upon reaction with carbon monoxide. The unquenching of the Rh and Ir complexes appears to be a consequence of the decreased electron density at Rh or Ir in the carbonyl complexes. In contrast, the substitution of an iodo ligand in [(4)AuI] by an electron-rich thiolate decreases the brightness of the BODIPY fluorophore, rendering the BODIPY as a highly sensitive probe for changes in the coordination sphere of the transition metal.
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