期刊
INORGANIC CHEMISTRY
卷 59, 期 11, 页码 7657-7665出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.inorgchem.0c00628
关键词
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资金
- University of Connecticut
We report the synthesis and characterization of C-2-symmetrical lanthanide complexes supported by enantiopure hexadentate ligands derived from 1,2-diaminocyclohexane. Coordination of (R,R)- or (S,S)-N,N,N',N'-tetrakis(2-pyridylmethyl) -trans- 1,2-diaminocyclohexane (tpdac) to samarium, europium, terbium, and dysprosium generates the corresponding C-2-symmetrical (tpdac)Ln(OTf)(3) complexes in high yields. The tpdac ligands are competent sensitizers for lanthanide luminescence, yielding modest emissions (Phi of <= 28%). Additionally, the complexes exhibit strong circularly polarized luminescence (vertical bar g(lum)vertical bar values of up to 0.13, 0.09, 0.22, and 0.15 for Sm, Eu, Tb, and Dy, respectively) in solution. We also observed that some transitions typically associated with small dissymmetry factors exhibit unusually high vertical bar g(lum)vertical bar values and, therefore, should not be overlooked in future studies.
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