Enantiomerically pure Tetravalent Neptunium Amidinates: Synthesis and Characterization
| Autor: | Thorsten Stumpf, Peter Kaden, Sebastian Fichter, Sebastian Kaufmann, Juliane März, Tobias S. Brunner, Peter W. Roesky |
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| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Chemistry & allied sciences
neptunium chemistry.chemical_element Halide 010402 general chemistry 01 natural sciences Catalysis Coordination complex chemistry.chemical_compound Reactivity (chemistry) chemistry.chemical_classification actinides 010405 organic chemistry Communication Neptunium Organic Chemistry General Chemistry Nuclear magnetic resonance spectroscopy Actinide Communications 0104 chemical sciences amidinates Coordination Chemistry Crystallography Enantiopure drug chemistry ddc:540 coordination chemistry transuranium chemistry Azide |
| Zdroj: | Chemistry-A European Journal 26(2020)41, 8867-8870 Chemistry (Weinheim an Der Bergstrasse, Germany) Chemistry-a European journal, 26 (41), 8867-8870 |
| ISSN: | 0947-6539 1521-3765 |
| Popis: | The synthesis of a tetravalent neptunium amidinate [NpCl((S)‐PEBA)3] (1) ((S)‐PEBA=(S,S)‐N,N′‐bis‐(1‐phenylethyl)‐benzamidinate) is reported. This complex represents the first structurally characterized enantiopure transuranic compound. Reactivity studies with halide/pseudohalides yielding [NpX((S)‐PEBA)3] (X=F (2), Br (3), N3 (4)) have shown that the chirality‐at‐metal is preserved for all compounds in the solid state. Furthermore, they represent an unprecedented example of a structurally characterized metal–organic Np complex featuring a Np−Br (3) bond. In addition, 4 is the only reported tetravalent transuranic azide. All compounds were additionally characterized in solution using para‐magnetic NMR spectroscopy showing an expected C 3‐symmetry at low temperatures. Enantiopure transuranic complexes: The first structurally characterized enantiopure complexes of neptunium have been synthesized. Starting from a chloro tris(amidinate) complex unprecedented neptunium(IV) fluoro, ‐bromo and ‐azido compounds could be yielded and characterized in solution and in the solid state (see scheme). |
| Databáze: | OpenAIRE |
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