Photophysics of lanthanide double-decker compounds with mixed octaethylporphyrinato and 2,3-naphthalocyaninato ligands

Photophysics of lanthanide double-decker compounds with mixed octaethylporphyrinato and 2,3-naphthalocyaninato ligands
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混合八乙基卟啉和2,3-萘酞菁配体的镧系双层化合物的光物理学

DOI:
10.1016/j.dyepig.2004.07.010
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发表时间:
2005-05
期刊:
影响因子:
4.5
通讯作者:
--
中科院分区:
材料科学2区
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--
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研究了MIII(OEP)(Nc)(M=La,Eu,Lu; OEP= 2,3,7,8,12,13,17,18-八乙基卟啉; Nc= 2,3-萘酞菁)和Ce(OEP)(Nc)的基态电子吸收光谱和发光光谱。在这些高π共轭体系中存在强的π-π相互作用。中心金属离子似乎在吸收光谱或发射光谱中没有直接作用,但通过调节环与环的分离和环与环的相互作用,对吸收光谱和发射光谱所揭示的配合物的性质有很大的影响。配合物MIII(OEP)(Nc)的吸收带取决于镧系离子半径,分别红移或蓝移(取决于电子跃迁性质),沿着镧系收缩。Ce(OEP)(Nc)与其他三种三价金属配合物相比,显示出特别不同的电子吸收特征。夹心双层配合物的快速失活过程主要是由两个大环偶联产生的额外的π-π相互作用和电子过渡态引起的。配合物中的镧系离子也通过重原子增强系间交叉速率或通过位于正常发射(π,π*)态以下的配体场或环金属电荷转移态打开新的途径来促进失活过程。
Ground state electronic absorption and luminescence spectra for MIII(OEP)(Nc) (M=La, Eu, Lu; OEP=2,3,7,8,12,13,17,18-octaethylporphyrinate; Nc=2,3-naphthalocyaninate) and Ce(OEP)(Nc) are recorded and comparatively studied. Strong π–π interactions are present in these highly π-conjugated systems. The central metal ions seem to play no direct role either in the absorption spectra or in the emissions, but have great influences on the properties of the complexes revealed by both absorption and emission spectra through tuning the ring-to-ring separation and thus ring-to-ring interaction. The absorption bands of the complexes MIII(OEP)(Nc) are dependent on the lanthanide ionic radius, red- or blue-shifted, respectively (depending on the electronic transition nature), along with the lanthanide contraction. Ce(OEP)(Nc) displays particularly different electronic absorption features in comparison with the other three tervalent metal complexes. The fast deactivation process for the sandwich double-decker complexes is mainly caused by the additional π–π interactions and electronic transition states arising from the coupling of the two macrocycles. The lanthanide ions in the complexes also facilitate the deactivation processes through heavy atom enhancement of intersystem crossing rate, or opening new pathways by ligand-field or ring-metal charge transfer states lying below the normally emissive (π,π*) states.
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