Coordination compounds of N,N′-olefin functionalized imidazolin-2-ylidenes |
| |
Authors: | Ekkehardt F Hahn Beate Heidrich Alexander Hepp Tania Pape |
| |
Institution: | Institut für Anorganische und Analytische Chemie, Westfälische Wilhelms Universität Münster, Corrensstraße 36, 48149 Münster, Germany |
| |
Abstract: | N-Heterocyclic carbene ligands (NHC) were metalated with Pd(OAc)2 or Ni(CH3CN)6](BF4)2 by in situ deprotonation of imidazolium salts to give the N-olefin functionalized biscarbene complexes MX2(NHC)2] 3-7 (3: M = Pd, X = Br, NHC = 1,3-di(3-butenyl)imidazolin-2-ylidene; 4: M = Pd, X = Br, NHC = 1,3-di(4-pentenyl)imidazolin-2-ylidene; 5: M = Pd, X = I, NHC = 1,3-diallylimidazolin-2-ylidene; 6: M = Ni, X = I, NHC = 1,3-diallylimidazolin-2-ylidene; 7: M = Ni, X = I, NHC = 1-methyl-3-allylimidazolin-2-ylidene). Molecular structure determinations for 4-7 revealed that square-planar complexes with cis (5) or trans (4, 6, 7) coordination geometry at the metal center had been obtained. Reaction of nickelocene with imidazolium bromides afforded the η5-cyclopentadienyl (η5-Cp) monocarbene nickel complexes NiBr(η5-Cp)(NHC)] 8 and 9 (8: NHC = 1-methyl-3-allylimidazolin-2-ylidene; 9: NHC = 1,3-diallylimidazolin-2-ylidene). The bromine abstraction in complexes 8 and 9 with silver tetrafluoroborate gave complexes NiBr(η5-Cp)(η3-NHC)] 10 and 11. The X-ray structure analysis of 10 and 11 showed a trigonal-pyramidal coordination geometry at the nickel(II) center and coordination of one N-allyl substituent. |
| |
Keywords: | Carbene N-Olefin substituent Palladium(II) Nickel(II) Structure determination |
本文献已被 ScienceDirect 等数据库收录! |
|