Jump to main content
Jump to site search

Issue 43, 2018
Previous Article Next Article

Molybdenum(VI) tris(amidophenoxide) complexes

Author affiliations


Tris(2-(arylamido)-4,6-di-tert-butylphenoxo)molybdenum(VI) complexes (Rap)3Mo can be prepared either from (cycloheptatriene)Mo(CO)3 and the N-aryliminoquinone, or from MoO2(acac)2 and the aminophenol. In contrast to all other reported unconstrained transition metal tris(amidophenoxide) complexes, the molybdenum complexes show a facial geometry in the solid state. In solution, the fac isomer predominates, though a small amount of mer isomer is detectable at room temperature. At elevated temperature the two species interconvert through Rây-Dutt trigonal twists, which are faster than Bailar twists in this system, presumably because of steric effects of the N-aryl groups. Substituents on the N-aryl ring shift the fac/mer equilibrium of the complex, with more electron-withdrawing substituents generally increasing the proportion of the mer isomer. The preference for fac over mer geometry is thus suggested to be due to enhanced π bonding in the fac isomer. In contrast to analogous catecholate complexes, the tris(amidophenoxide) complexes are not Lewis acidic and are inert to nucleophilic oxidants such as amine-N-oxides.

Graphical abstract: Molybdenum(vi) tris(amidophenoxide) complexes

Back to tab navigation

Supplementary files

Publication details

The article was received on 19 Aug 2018, accepted on 15 Oct 2018 and first published on 16 Oct 2018

Article type: Paper
DOI: 10.1039/C8DT03392G
Citation: Dalton Trans., 2018,47, 15583-15595

  •   Request permissions

    Molybdenum(VI) tris(amidophenoxide) complexes

    A. N. Erickson and S. N. Brown, Dalton Trans., 2018, 47, 15583
    DOI: 10.1039/C8DT03392G

Search articles by author