Evidence for covalence in a N-donor complex of americium(iii)

Adam C.; Kaden P.; Beele B.B.Müllich U.Trumm S.Geist A.Panak P.J.Denecke M.A.

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Evidence for covalence in a N-donor complex of americium(iii)

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The molecular origin of the selectivity of N-donor ligands, such as alkylated bis-triazinyl pyridines (BTPs), for actinide complexation in the presence of lanthanides is still largely unclear. NMR investigations of an Am(nPrBTP)_3 ~(3+) complex with a ~(15)N labelled ligand showed that it exhibits large differences in ~(15)N chemical shift for coordinating N-atoms in comparison to both lanthanide(iii) complexes and the free ligand. The temperature dependence of NMR chemical shifts observed for this complex indicates a weak paramagnetism. This fact and the observed large chemical shift for bound nitrogen atoms allow us to conclude that metal-ligand bonding in the reported Am(iii) N-donor complex has a larger share of covalence than in lanthanide complexes. This may account for the observed selectivity.

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《Dalton transactions: An international journal of inorganic chemistry》 |2013年第39期|14068-14074|共7页
作者
Adam C.; Kaden P.; Beele B.B.Müllich U.Trumm S.Geist A.Panak P.J.Denecke M.A.;
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作者单位

Karlsruhe Institute of Technology (KIT), Institute for Nuclear Waste Disposal (INE), P.O. Box 3640, 76021 Karlsruhe, Germany;

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原文格式 PDF
正文语种英语
中图分类 54;
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Evidence; covalence; N-donor;

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Evidence for covalence in a N-donor complex of americium(iii)

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