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Main Title: Der erste verbrückte, bifunktionelle Cyclopentadienyl-Imidazolyliden- Ligand und Komplexe mit Titan und Zirconium
Translated Title: The First Bridged, Bifunctional Cyclopentadienyl-Imidazolylidene Ligand and Complexes with Titanium and Zirconium
Author(s): Müller, Jörn
Piotrowski, Ingo
Chrzanowski, Lars von
Type: Article
Language Code: de
Abstract: Starting from imidazole, 1-[2-(cyclopenta-2,4-dienyl)ethyl]-3-methylimidazolium iodide (3) was obtained as a mixture of isomers by a simple three-step synthesis. The reaction of 3 with Ti(NEt2)4 or Zr(NEt2)4 by double deprotonation of the imidazolium salt led to the isomerically pure cationic complexes [{η5-C5H4-(CH2)2-NHC}M(NEt2)2]+I− (NHC = N-heterocyclic carbene) 4a (M = Ti) and 4b (M = Zr), respectively, in which a cyclopentadienyl and a methylimidazol-2-ylidene unit are linked by an ethylidene-1,2 bridge to form a novel chelating ligand system. In the case of the reaction of 3 with Zr(NEt2)4 the neutral compound [{η5-C5H4-(CH2)2-NHC}Zr(NEt2)I2] (5) is formed as an additional product. According to the X-ray structure analyses, the titanium atom of 4a is tetracoordinated while no coordinative interaction exists with the iodide anion; on the other hand, in 5 the zirconium centre is pentacoordinated.
Issue Date: 2007
Date Available: 10-Oct-2018
DDC Class: 540 Chemie und zugeordnete Wissenschaften
Subject(s): Titanium
Bridged Cyclopentadienyl N-Heterocyclic Carbene Ligands
crystal structures
agostic interaction
Sponsor/Funder: Wir danken der Deutschen Forschungsgemeinschaft (Graduiertenkolleg 352) für die Förderung dieser Untersuchungen.
Journal Title: Zeitschrift für Naturforschung B
Publisher: De Gruyter
Publisher Place: Berlin
Volume: 62
Issue: 3
Publisher DOI: 10.1515/znb-2007-0322
Page Start: 467
Page End: 474
EISSN: 1865-7117
ISSN: 0932-0776
Appears in Collections:Inst. Chemie » Publications

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