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About Heptacarbonylcations: Syntheses and crystal structures of [M(CO)7][Al(OC(CF3)3)4] (M = Nb, Ta)

 Bei der diesjährigen Wöhlertagung in Regensburg hat Wiebke Unkrig, Doktorandin im Arbeitskreis von Prof. Krossing, für ihr Poster zum Thema Heptacarboylkationen von 276 ausgestellten Postern einen der begehrten Posterpreise gewonnen. Dazu gratulieren ihr wir herzlich!


Syntheses and crystal structures of [M(CO)7][Al(OC(CF3)3)4] (M = Nb, Ta)

Wiebke Unkrig and Ingo Krossing*
Albert-Ludwigs-Universität, Institut für Anorganische und Analytische Chemie and Freiburger
Materialforschungszentrum (FMF)
wiebke.unkrig@ac.uni-freiburg.de, krossing@uni-freiburg.de

Our objectives were the syntheses of Heptacarbonylcations of the 4d and 5d transition metals Niobium
and Tantalum in the condensed phase, which could be proved by MS in the gas phase already. These
Gas Phase Cations (GPCs) observed by Ricks et al.[1,2] are promising molecules in the group of GPCs,
as they follow the 18VE rule interrelated with a high postulated stability. To enable condensed phase
access to GPC salts, Weakly Coordinating Anions (WCAs), such as the perfluoro-
tert-butoxy aluminate
F)4](RF = C(CF3)3), inducing Pseudo Gas Phase Conditions are used.[3]

Our aim is to take inspiration from the wealth of experience from the GPCs known from advanced MS
methods and harvest the application potential of stable GPC salts from mechanistic studies up to small
molecule activation and catalysis.


[1] A. M. Ricks, Z. D. Reed, M. A. Duncan, J. Am. Chem. Soc. 2009, 131, 9176.
[2] A. M. Ricks, A. D. Brathwaite, M. A. Duncan,
J. Phys. Chem. A 2013, 117, 1001.
[3] I. Krossing, I. Raabe,
Angew. Chem. 2004, 116, 2116

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