Carbene Complexes of Pnictogen Pentafluorides and Boron Trifluoride |
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| Authors: | Anthony J Arduengo III Fredric Davidson Roland Krafczyk William J Marshall Reinhard Schmutzler |
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| Institution: | Institut für Anorganische und Analytische Chemie der Technischen Universit?t Braunschweig, D-38023 Braunschweig, Germany, DE
DuPont Science and Engineering Laboratory, Experimental Station Wilmington, Delaware 19880-0328, USA, US
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| Abstract: | Summary. Synthesis, characterization, and solid state X-ray crystallographic structures for 12-Pn-6 complexes derived from carbene 4,5-dichloro-1,3-dimesitylimidazol-2-ylidene and phosphorus, arsenic, or antimony pentafluoride
are reported. The adducts show octahedral geometries at the pnictogen centers with C-Pn bond distances of 189.8 (P), 199.9 (As), and 217.5 (Sb) pm. The structures are those of internal zwitterions with imidazolium
ion character in the heterocyclic ring and a pentafluoropnictanide anion bonded to C2. Adducts of BF3 with 1,3-dimesitylimidazol-2-ylidene and 4,5-dichloro-1,3-dimesitylimidazol-2-ylidene are also reported for comparison. Although
the reactivity of chlorinated and non-chlorinated carbenes varies considerably, the spectroscopic and structural properties
of analogous adducts are remarkably similar.
Received September 6, 1999. Accepted (revised) October 20, 1999 |
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| Keywords: | , ,Carbene, Pnictogen(V) fluorides, Boron(III) fluoride, Zwitterions, Imidazol-2-ylidene, |
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