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Breaking Chemistry's Strongest Bond: Can Three-Coordinate [M{N(R)Ar}3] Complexes Cleave Carbon Monoxide

journal contribution
posted on 2023-05-16, 21:23 authored by Christian, G, Stranger, R, Petrie, S, Brian YatesBrian Yates, Cummins, CC
The reaction pathway for the interaction of CO with three-coordinate TaIII, WIII and ReIII complexes (modelled on the experimental [M{N-(tBu)Ar}3] system) has been explored by using density functional methods. Calculations show that CO binds without a barrier to [Re(NH2)3], forming the encounter complex [OC-Re-(NH 2)3], which is stabilized by ≈ 280 kJ mol-1 relative to the reactants. The binding of [Ta(NH2)3] to the oxygen terminus of CO is inhibited by a barrier of only 20 kJ mol -1 and is followed by spontaneous cleavage of the C-O bond to form the sproducts [C-Re(NH2)3] and [O-Ta(NH2) 3]. The salient features of the potential energy surface are more favourable to CO cleavage than the analogous N2 cleavage by [Mo(NH2)3], which is less exothermic (335 vs. 467 kJ mol-1) and is impeded by a significant barrier (66 kJ mol -1). The ReIII/TaIII/CO system therefore appears to be an excellent candidate for cleaving the exceptionally strong C-O bond under mild laboratory conditions. The related WIII/Ta III dimer, which significantly weakens but does not cleave the CO bond, may be a suitable alternative when the chemistry is to be performed on activated CO rather than on the strongly bound oxide and carbide cleavage products. © 2007 Wiley-VCH Verlag GmbH & Co. KGaA.

History

Publication title

Chemistry - A European Journal

Volume

13

Issue

15

Pagination

4264-4272

ISSN

0947-6539

Department/School

School of Natural Sciences

Publisher

Wiley-VCH

Place of publication

Weinheim

Repository Status

  • Restricted

Socio-economic Objectives

Expanding knowledge in the chemical sciences

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