Formation of a cobalt(III) imido from a cobalt(II) amido complex. Evidence for proton-coupled electron transfer

被引:115
作者
Cowley, Ryan E.
Bontchev, Ranko P.
Sorrell, John
Sarracino, Orcino
Feng, Yanhua
Wang, Haobin
Smith, Jeremy M. [1 ]
机构
[1] New Mexico State Univ, Dept Chem & Biochem, Las Cruces, NM 88003 USA
[2] Sandia Natl Labs, Albuquerque, NM 87185 USA
关键词
D O I
10.1021/ja066899n
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
The cobalt(II) amido complex, (LCoNHBu)-Bu-t (L = bulky tris(carbene)borate) reacts with the 2,4,6-tri(tertbutyl) phenoxy radical to form the cobalt(III) imido, (LCoNBu)-Bu-t. A computational investigation (SDD and 6-31G*) of possible reaction pathways provides evidence for a mechanism involving concerted proton-coupled electron transfer. The N-H BDE is computationally estimated to be 75 kcal/mol.
引用
收藏
页码:2424 / +
页数:3
相关论文
共 40 条
[1]   CHEMISTRY OF STABLE PHONOXY RADICALS [J].
ALTWICKE.ER .
CHEMICAL REVIEWS, 1967, 67 (05) :475-+
[2]   PROTON-COUPLED ELECTRON-TRANSFER IN ACETONITRILE SOLUTION - IRREVERSIBLE DISPROPORTIONATION OF [RU-III(BPY)(2)(PY)(OH)](2+) [J].
BINSTEAD, RA ;
STULTZ, LK ;
MEYER, TJ .
INORGANIC CHEMISTRY, 1995, 34 (03) :546-551
[3]   Solvent effects on homolytic bond dissociation energies of hydroxylic acids [J].
Bordwell, FG ;
Liu, WZ .
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 1996, 118 (44) :10819-10823
[4]   BOND-DISSOCIATION ENERGIES IN DMSO RELATED TO THE GAS-PHASE [J].
BORDWELL, FG ;
CHENG, JP ;
JI, GZ ;
SATISH, AV ;
ZHANG, XM .
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 1991, 113 (26) :9790-9795
[5]   An evaluation of structural models for the photosynthetic water-oxidizing complex derived from spectroscopic and X-ray diffraction signatures [J].
Carrell, TG ;
Tyryshkin, AM ;
Dismukes, GC .
JOURNAL OF BIOLOGICAL INORGANIC CHEMISTRY, 2002, 7 (1-2) :2-22
[6]   Removing the sting from the tail: Reversible protonation of scorpionate ligands in cobalt(II) tris(carbene) borate complexes [J].
Cowley, Ryan E. ;
Bontchev, Ranko P. ;
Duesler, Eileen N. ;
Smith, Jeremy M. .
INORGANIC CHEMISTRY, 2006, 45 (24) :9771-9779
[7]   [Me2NN]Co(η6-toluene):: O=O, N= N, and O=N bond cleavage provides, β-diketiminato cobalt μ-oxo and imido complexes [J].
Dai, XL ;
Kapoor, P ;
Warren, TH .
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 2004, 126 (15) :4798-4799
[8]   Coordination-number dependence of reactivity in an imidoiron(III) complex [J].
Eckert, Nathan A. ;
Vaddadi, Sridhar ;
Stoian, Sebastian ;
Lachicotte, Rene J. ;
Cundari, Thomas R. ;
Holland, Patrick L. .
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION, 2006, 45 (41) :6868-6871
[9]   Terminal cobalt(III) imido complexes supported by tris(carbene) ligands: Imido insertion into the cobalt-carbene bond [J].
Hu, XL ;
Meyer, K .
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 2004, 126 (50) :16322-16323
[10]   Proton-coupled electron transfer from nitrogen. A N-H/N-D kinetic isotope effect of 41.4 [J].
Huynh, MHV ;
Meyer, TJ ;
White, PS .
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 1999, 121 (18) :4530-4531