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Kraus F, Baer SA. UF6 and UF4 in liquid ammonia: [UF7(NH3)]3- and [UF4(NH3)4]. Chemistry. 2009;15(33):8269-74doi: 10.1002/chem.200901044.
Kraus, F., & Baer, S. A. (2009). UF6 and UF4 in liquid ammonia: [UF7(NH3)]3- and [UF4(NH3)4]. Chemistry (Weinheim an der Bergstrasse, Germany), 15(33), 8269-74. https://doi.org/10.1002/chem.200901044
Kraus, Florian, and Baer, Sebastian A. "UF6 and UF4 in liquid ammonia: [UF7(NH3)]3- and [UF4(NH3)4]." Chemistry (Weinheim an der Bergstrasse, Germany) vol. 15,33 (2009): 8269-74. doi: https://doi.org/10.1002/chem.200901044
Kraus F, Baer SA. UF6 and UF4 in liquid ammonia: [UF7(NH3)]3- and [UF4(NH3)4]. Chemistry. 2009 Aug 17;15(33):8269-74. doi: 10.1002/chem.200901044. PMID: 19585645.
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Chemistry. 2009 Aug 17;15(33):8269-74. doi: 10.1002/chem.200901044.

UF6 and UF4 in liquid ammonia: [UF7(NH3)]3- and [UF4(NH3)4].

Chemistry (Weinheim an der Bergstrasse, Germany)

Florian Kraus, Sebastian A Baer

Affiliations

  1. Department Chemie, Technische Universität München, Lichtenbergstrasse 4, 85747 Garching, Germany. [email protected]

PMID: 19585645 DOI: 10.1002/chem.200901044

Abstract

From the reaction of uranium hexafluoride UF6 with dry liquid ammonia, the [UF7(NH3)]3- anion and the [UF4(NH3)4] molecule were isolated and identified for the first time. They are found in signal-green crystals of trisammonium monoammine heptafluorouranate(IV) ammonia (1:1; [NH4]3[UF7(NH3)].NH3) and emerald-green crystals of tetraammine tetrafluorouranium(IV) ammonia (1:1; [UF4(NH3)4].NH3). [NH4]3[UF7(NH3)].NH3 features discrete [UF7(NH3)]3- anions with a coordination geometry similar to a bicapped trigonal prism, hitherto unknown for U(IV) compounds. The emerald-green [UF4(NH3)4].NH3 contains discrete tetraammine tetrafluorouranium(IV) [UF4(NH3)4] molecules. [UF4(NH3)4].NH3 is not stable at room temperature and forms pastel-green [UF4(NH3)4] as a powder that is surprisingly stable up to 147 degrees C. The compounds are the first structurally characterized ammonia complexes of uranium fluorides.

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