Homoleptic isocyanidemetalates of 4d- and 5d-transition metals: [Nb(CNXyl)6]-, [Ta(CNXyl)6]-, and derivatives thereof

Mikhail V. Barybin, William W. Brennessel, Benjamin E. Kucera, Mikhail E. Minyaev, Victor J. Sussman, Victor G Young, John E Ellis

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Treatment of [M(CO)6]-, M = Nb, Ta, with Ag +, I2 or NO+ in the presence of CNXyl provided [M(CNXyl)7]+, M(CNXyl)6I, or cis-[M(CNXyl) 4(NO)2]+, which are isocyanide analogues of the unknown carbonyl complexes [M(CO)7]+, M(CO)6I, or cis-[M(CO)4(NO)2]+, respectively. Reduction of M(CNXyl)6I by cesium graphite gave the respective Cs[M(CNXyl)6], which have been structurally characterized and represent the first isolable homoleptic isocyanidemetalates for second or third row transition metals. Nitrosylation of [Ta(CNXyl)6]- affords a rare example of a mononitrosyl tantalum complex, Ta(CNXyl) 5NO, which is an isocyanide analogue of the unknown Ta(CO) 5NO. This study emphasizes, inter alia, the remarkable versatility of the CNXyl ligand compared to CO in stabilizing various electronic environments at heavier group 5 metal centers.

Original languageEnglish (US)
Pages (from-to)1141-1150
Number of pages10
JournalJournal of the American Chemical Society
Issue number5
StatePublished - Feb 7 2007


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