Mononuclear and dinuclear bromo bridged iridium(I) complexes with N-allyl substituted imidazolin-2-ylidene ligands |
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| Authors: | F. Ekkehardt Hahn Beate Heidrich Alexander Hepp Eduardo Sola |
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| Affiliation: | a Institut für Anorganische und Analytische Chemie, Westfälische Wilhelms Universität Münster, Corrensstraße 36, 48149 Münster, Germany
b Departamento de Quimica Inorgánica, Instituto de Ciencia de Materiales de Aragón, Universidad de Zaragoza-CSIC, and Instituto Universitario de Catálisis Homogénea, Universidad de Zaragoza, 50009 Zaragoza, Spain |
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| Abstract: | The reaction of 1-methyl-3-(2-propenyl)imidazolium bromide (1) or 1,3-bis(2-propenyl)-imidazolium bromide (2) with [Ir(μ-OMe)(cod)]2 afforded the five coordinated iridium(I) carbene complexes [IrBr(L)(cod)] (3) (L=1-methyl-3-(2-propenyl)imidazolin-2-ylidene) and (4) (L=1,3-bis(2-propenyl)imidazolin-2-ylidene). The reaction proceeds via an in situ deprotonation of the imidazolium salt. Molecular structure determinations on 3 and 4 confirmed the coordination of the carbene ligands via the carbene carbon atom and one allyl group in both complexes. Treatment of complex 3 with an excess of AgBF4 gave the dinuclear bromo bridged complex [(Ir(μ-Br)(L)(cod)]2BF4 (5) (L=1-methyl-3-(2-propenyl)imidazolin-2-ylidene). The reaction of complex 4 with an excess of AgBF4 led to the mononuclear complex [Ir(L)(cod)]BF4 (6) (L=1,3-bis(2-propenyl)imidazolin-2-ylidene) where both N-allyl substituents are coordinated to the iridium(I) center. |
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| Keywords: | Carbene ligand N-Allyl substituent Iridium(I) Structure determination |
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