Ta(CNDipp)6: An Isocyanide Analogue of Hexacarbonyltantalum(0)1. Issue 35 (26th July 2017)

• Record Type: Journal Article
• Authors: Chakarawet, Khetpakorn; Davis‐Gilbert, Zachary W.; Harstad, Stephanie R.; Young, Victor G.; Long, Jeffrey R.; Ellis, John E.
• Is Part Of: Angewandte Chemie international edition. Volume 56:Issue 35(2017)
• Page Start: 10577
• Page End: 10581
• Publication Date: 2017-07-26
• Subjects: 17-electron complex -- disproportionation -- isocyanide ligands -- metalloradical -- tantalum; Chemistry -- Periodicals; 540
• DOI: 10.1002/anie.201706323
• Languages: English
• ISSNs: 1433-7851

Abstract

Abstract: Hexakis(2, 6‐diisopropylphenylisocyanide)tantalum is the first isocyanide analogue of the highly unstable Ta(CO)6 and represents the only well‐defined zerovalent tantalum complex to be prepared by conventional laboratory methods. Two prior examples of homoleptic Ta 0 complexes are known, Ta(benzene)2 and Ta(dmpe)3, dmpe=1, 2‐bis(dimethylphosphano)ethane, but these have only been accessed via ligand co‐condensation with tantalum vapor in a sophisticated metal‐atom reactor. Consistent with its 17‐electron nature, Ta(CNDipp)6 undergoes facile one‐electron oxidation, reduction, or disproportionation reactions. In this sense, it qualitatively resembles V(CO)6, the only paramagnetic homoleptic metal carbonyl isolable under ambient conditions. Abstract : Ta tantalizing : The first paramagnetic homoleptic metal isocyanide of a 5d‐transition metal is hexakis(2, 6‐diisopropylphenylisocyanide)tantalum. It is an analogue of the highly unstable hexacarbonyltantalum(0) and is the only structurally authenticated zerovalent tantalum complex to be prepared by conventional laboratory methods. It has properties consistent with a 17‐electron metalloradical.