Circularly Polarized Luminescence from Enantiopure C2-Symmetrical Tetrakis(2-pyridylmethyl)-1,2-diaminocyclohexane Lanthanide Complexes.,Inorganic Chemistry

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Circularly Polarized Luminescence from Enantiopure C2-Symmetrical Tetrakis(2-pyridylmethyl)-1,2-diaminocyclohexane Lanthanide Complexes.
Inorganic Chemistry ( IF 4.3 ) Pub Date : 2020-05-19 , DOI: 10.1021/acs.inorgchem.0c00628
Kaitlynn M Ayers ₁ , Nathan D Schley ₂ , Gaël Ung ₁

Affiliation

We report the synthesis and characterization of C₂-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 C₂-symmetrical (tpdac)Ln(OTf)₃ complexes in high yields. The tpdac ligands are competent sensitizers for lanthanide luminescence, yielding modest emissions (Φ of ≤28%). Additionally, the complexes exhibit strong circularly polarized luminescence (|g_lum| 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 |g_lum| values and, therefore, should not be overlooked in future studies.

中文翻译：

对映体C2-对称四（2-吡啶甲基）-1,2-二氨基环己烷镧系元素络合物的圆偏振发光。

我们报告了合成和表征由衍生自1,2-二氨基环己烷的对映体纯六齿配体支持的C _2-对称镧系元素配合物。（R，R）-或（S，S）-N，N，N '，N'-四（2-吡啶甲基）-反式-1,2-二氨基环己烷（tpdac）与sa 、,、 ter和generates生成相应的C ₂对称（tpdac）Ln（OTf）₃配合物高产。tpdac配体是镧系元素发光的合格敏化剂，产生适度的发射（Φ≤28％）。另外，该复合物在溶液中显示出强的圆偏振发光（分别对于Sm，Eu，Tb和Dy而言| g _lum |值分别高达_{0.13、0.09、0.22}和0.15）。我们还观察到，通常与较小的不对称因子相关的某些过渡表现出异常高的摹_LUM | 价值观，因此在以后的研究中不应忽视。

更新日期：2020-05-19

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