Ligand influence versus electronic configuration of d-metal ion in determining the fate of NIR emission from Ln(III) ions: a case study with Cu-II, Ni-II and Zn-II complexes

Verma Abhineet; Hossain S. K. Saddam; Sunkari Sailaja S.; Reibenspies Joseph; Saha Satyen

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Ligand influence versus electronic configuration of d-metal ion in determining the fate of NIR emission from Ln(III) ions: a case study with Cu-II, Ni-II and Zn-II complexes

机译：Ligand影响与D-金属离子的电子构型在确定LN（III）离子的NIR排放的命运中：用Cu-II，Ni-II和Zn-II复合物进行案例研究

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Lanthanides (Ln(III)) are well known for their characteristic emission in the near-infrared region (NIR). However, direct excitation of lanthanides is not feasible as described by Laporte's parity selection rule. Here, we obtain NIR emission from [L-M-Ln] complexes (where, L = an organic ligand, M = a d-block metal ion, and Ln = a lanthanide ion) in which the [L-M] moiety acts as an antenna to absorb the excitation light to transfer to Ln energy levels. Based on fifteen lanthanide complexes that are presented here in which Cu, Ni and Zn complexes with a Schiff base ligand act as an antenna, we have demonstrated for the first time that electronic configuration of the d-block metal ion is very crucial for obtaining NIR emission. With Ln ion and the same ligand, Cu and Ni complexes show completely different emission than that of the corresponding NIR emitting [L-Zn-Ln] complexes.

机译：镧系元素（Ln（III））以其在近红外区（NIR）的特征发射而闻名。然而，按照拉波特的奇偶选择规则，直接激发镧系元素是不可行的。在这里，我们从[L-M-Ln]络合物（其中，L=有机配体，M=d-嵌段金属离子，Ln=镧系元素离子）中获得NIR发射，[L-M]部分作为天线吸收激发光以转移到Ln能级。基于十五种稀土配合物，其中铜、镍和锌配合物与希夫碱配体作为天线，我们首次证明了d-嵌段金属离子的电子构型对获得近红外发射非常关键。在Ln离子和相同配体的情况下，铜和镍配合物的发射与相应的近红外发射[L-Zn-Ln]配合物完全不同。

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《New Journal of Chemistry》 |2021年第5期|共14页
作者
Verma Abhineet; Hossain S. K. Saddam; Sunkari Sailaja S.; Reibenspies Joseph; Saha Satyen;
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Banaras Hindu Univ Inst Sci Dept Chem Varanasi Uttar Pradesh India;

Univ Hyderabad Sch Chem Hyderabad India;

Banaras Hindu Univ Dept Chem Mahila Maha Vidhyalaya Varanasi Uttar Pradesh India;

Texas A&

M Univ Dept Chem Xray Diffract Lab College Stn TX 77843 USA;

Banaras Hindu Univ Inst Sci Dept Chem Varanasi Uttar Pradesh India;

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Ligand influence versus electronic configuration of d-metal ion in determining the fate of NIR emission from Ln(III) ions: a case study with Cu-II, Ni-II and Zn-II complexes

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