AT-heterocyclic (NHC) ligands constitute a new class of ligands that is going to commonly be used in organometallic chemistry. Nevertheless, detailed understanding of the bonding properties of these ligands to transition metals is scarce. In particular, a clear separation between steric and electronic effects is missing. Only in recent years combined experimental and computational studies on this topic have been performed. Here we review some advances in the field. We thus present a quantification of steric effects on the bond dissociation energy of various NHC-ligands from transition metals in complexes as Cp*Ru(NHC)Cl and Ni(CO)(3)(NHC). We further compare the steric requirements of various NHC ligands with the steric requirements of some phosphines. In the second part, we examine the different bonding modes that can contribute to the NHC-metal bond. We will review examples of metal-to-NHC back-donation (sigma -> 4d*) as well as of ligand-to-metal-to-NHC back-donation (pi -> d). (c) 2005 Elsevier B.V. All rights reserved.
机构:
Chiba Univ, Grad Sch Sci, Dept Chem, Inage Ku, Chiba 2638522, Japan
Chiba Univ, Mol Chiral Res Ctr, Inage Ku, Chiba 2638522, JapanChiba Univ, Grad Sch Sci, Dept Chem, Inage Ku, Chiba 2638522, Japan
Yoshida, Kazuhiro
Yasue, Risa
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Chiba Univ, Grad Sch Sci, Dept Chem, Inage Ku, Chiba 2638522, JapanChiba Univ, Grad Sch Sci, Dept Chem, Inage Ku, Chiba 2638522, Japan
机构:
Univ Pittsburgh, Dept Chem, Pittsburgh, PA 15260 USAUniv Pittsburgh, Dept Chem, Pittsburgh, PA 15260 USA
Shao, Huiling
Wang, Yuening
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Univ Pittsburgh, Dept Chem, Pittsburgh, PA 15260 USAUniv Pittsburgh, Dept Chem, Pittsburgh, PA 15260 USA
Wang, Yuening
Bielawski, Christopher W.
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IBS, CMCM, Ulsan 44919, South Korea
UNIST, Dept Chem, Ulsan 44919, South Korea
UNIST, Dept Energy Engn, Ulsan 44919, South KoreaUniv Pittsburgh, Dept Chem, Pittsburgh, PA 15260 USA
Bielawski, Christopher W.
Liu, Peng
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Univ Pittsburgh, Dept Chem, Pittsburgh, PA 15260 USA
Univ Pittsburgh, Dept Chem & Petr Engn, Pittsburgh, PA 15260 USAUniv Pittsburgh, Dept Chem, Pittsburgh, PA 15260 USA
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Boston Coll, Dept Chem, Merkert Chem Ctr, Chestnut Hill, MA 02467 USAUniv Jaume 1, Dept Quim Inorgan & Organ, E-12071 Castellon de La Plana, Spain
Corberan, Rosa
Mas-Marza, Elena
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Univ Bath, Dept Chem, Bath BA2 7AY, Avon, EnglandUniv Jaume 1, Dept Quim Inorgan & Organ, E-12071 Castellon de La Plana, Spain
Mas-Marza, Elena
Peris, Eduardo
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Univ Jaume 1, Dept Quim Inorgan & Organ, E-12071 Castellon de La Plana, SpainUniv Jaume 1, Dept Quim Inorgan & Organ, E-12071 Castellon de La Plana, Spain
机构:
Chiba Univ, Grad Sch Sci, Dept Chem, Inage Ku, Chiba 2638522, Japan
Chiba Univ, Mol Chiral Res Ctr, Inage Ku, Chiba 2638522, JapanChiba Univ, Grad Sch Sci, Dept Chem, Inage Ku, Chiba 2638522, Japan
Yoshida, Kazuhiro
Yasue, Risa
论文数: 0引用数: 0
h-index: 0
机构:
Chiba Univ, Grad Sch Sci, Dept Chem, Inage Ku, Chiba 2638522, JapanChiba Univ, Grad Sch Sci, Dept Chem, Inage Ku, Chiba 2638522, Japan
机构:
Univ Pittsburgh, Dept Chem, Pittsburgh, PA 15260 USAUniv Pittsburgh, Dept Chem, Pittsburgh, PA 15260 USA
Shao, Huiling
Wang, Yuening
论文数: 0引用数: 0
h-index: 0
机构:
Univ Pittsburgh, Dept Chem, Pittsburgh, PA 15260 USAUniv Pittsburgh, Dept Chem, Pittsburgh, PA 15260 USA
Wang, Yuening
Bielawski, Christopher W.
论文数: 0引用数: 0
h-index: 0
机构:
IBS, CMCM, Ulsan 44919, South Korea
UNIST, Dept Chem, Ulsan 44919, South Korea
UNIST, Dept Energy Engn, Ulsan 44919, South KoreaUniv Pittsburgh, Dept Chem, Pittsburgh, PA 15260 USA
Bielawski, Christopher W.
Liu, Peng
论文数: 0引用数: 0
h-index: 0
机构:
Univ Pittsburgh, Dept Chem, Pittsburgh, PA 15260 USA
Univ Pittsburgh, Dept Chem & Petr Engn, Pittsburgh, PA 15260 USAUniv Pittsburgh, Dept Chem, Pittsburgh, PA 15260 USA
机构:
Boston Coll, Dept Chem, Merkert Chem Ctr, Chestnut Hill, MA 02467 USAUniv Jaume 1, Dept Quim Inorgan & Organ, E-12071 Castellon de La Plana, Spain
Corberan, Rosa
Mas-Marza, Elena
论文数: 0引用数: 0
h-index: 0
机构:
Univ Bath, Dept Chem, Bath BA2 7AY, Avon, EnglandUniv Jaume 1, Dept Quim Inorgan & Organ, E-12071 Castellon de La Plana, Spain
Mas-Marza, Elena
Peris, Eduardo
论文数: 0引用数: 0
h-index: 0
机构:
Univ Jaume 1, Dept Quim Inorgan & Organ, E-12071 Castellon de La Plana, SpainUniv Jaume 1, Dept Quim Inorgan & Organ, E-12071 Castellon de La Plana, Spain