Hemilabile and Bimetallic Coordination in Rh and Ir Complexes of NCN Pincer Ligands
Two new pincer ligands have been developed that contain a central N-heterocyclic carbene (NHC) moiety linked to two pendant pyrazole groups by either a methylene (NCNme) or ethylene (NCNet) chain. The coordination of these two ligands to rhodium and iridium resulted in a variety of binding modes. Tr...
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Published in | Inorganic chemistry Vol. 53; no. 19; pp. 10159 - 10170 |
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Main Authors | , , , |
Format | Journal Article |
Language | English |
Published |
United States
American Chemical Society
06.10.2014
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Online Access | Get full text |
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Summary: | Two new pincer ligands have been developed that contain a central N-heterocyclic carbene (NHC) moiety linked to two pendant pyrazole groups by either a methylene (NCNme) or ethylene (NCNet) chain. The coordination of these two ligands to rhodium and iridium resulted in a variety of binding modes. Tridentate coordination of the ligands was observed in the complexes [Rh(NCNme)(COD)]BPh4 (8), [Ir(NCNme)(COD)]BPh4 (10), [Rh(NCNet)(CO)2]BPh4 (13), and [Ir(NCNme)(CO)2]BPh4 (14), and monodentate NHC coordination was observed for [Ir(NCNme)2(COD)]BPh4 (11) and [Ir(NCNet)2(COD)]BPh4 (12). Both tridentate and bidentate coordination modes were characterized for [Rh(NCNet)(COD)]BPh4 (9) in the solution and solid state, respectively, while an unusual bridging mode was observed for the bimetallic complex [Rh(μ-NCNme)(CO)]2(BPh4)2 (15). The impact of this diverse coordination chemistry on the efficiency of the complexes as catalysts for the addition of NH, OH, and SiH bonds to alkynes was explored. |
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Bibliography: | ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23 |
ISSN: | 0020-1669 1520-510X |
DOI: | 10.1021/ic501158x |