Interconversion of conjugated and nonconjugated polyolefin cobalt complexes in two oxidation states: an electrochemical and NMR study

1986 ◽  
Vol 108 (24) ◽  
pp. 7454-7461 ◽  
Author(s):  
William E. Geiger ◽  
Thomas. Gennett ◽  
Maria. Grzeszczuk ◽  
Gregg A. Lane ◽  
Jerome. Moraczewski ◽  
...  
Keyword(s):  
Cobalt Complexes ◽  
Oxidation States ◽  
Nmr Study

ChemInform Abstract: Interconversion of Conjugated and Nonconjugated Polyolefin-Cobalt Complexes in Two Oxidation States: An Electrochemical and NMR Study.

ChemInform ◽  
1987 ◽  
Vol 18 (14) ◽  
Author(s):  
W. E. GEIGER ◽  
T. GENNETT ◽  
M. GRZESZCZUK ◽  
G. A. LANE ◽  
J. MORACZEWSKI ◽  
...  
Keyword(s):  
Cobalt Complexes ◽  
Oxidation States ◽  
Nmr Study

Nitrogen-15 and cobalt-59 NMR study of the bent nitrosyl ligand in cobalt complexes

1984 ◽  
Vol 23 (22) ◽  
pp. 3629-3633 ◽  
Author(s):  
John Bultitude ◽  
Leslie F. Larkworthy ◽  
Joan Mason ◽  
David C. Povey ◽  
Barry Sandell
Keyword(s):  
Cobalt Complexes ◽  
Nmr Study

A systematic 125Te NMR study of organotellurium compounds: The effect of oxidation states and substituents

Tetrahedron ◽  
1999 ◽  
Vol 55 (9) ◽  
pp. 2545-2552 ◽  
Author(s):  
Shinichi Saito ◽  
Jian Zhang ◽  
Kyoko Tanida ◽  
Shigemasa Takahashi ◽  
Toru Koizumi
Keyword(s):  
Oxidation States ◽  
Nmr Study ◽  
Organotellurium Compounds

ChemInform Abstract: NITROGEN-15 AND COBALT-59 NMR STUDY OF THE BENT NITROSYL LIGAND IN COBALT COMPLEXES

1985 ◽  
Vol 16 (7) ◽  
Author(s):  
J. BULTITUDE ◽  
L. F. LARKWORTHY ◽  
J. MASON ◽  
D. C. POVEY ◽  
B. SANDELL
Keyword(s):  
Cobalt Complexes ◽  
Nmr Study

Oxidation of Cobalt(II) Bispidine Complexes with Dioxygen

2017 ◽  
Vol 70 (5) ◽  
pp. 576 ◽  
Author(s):  
Peter Comba ◽  
Bianca Pokrandt ◽  
Hubert Wadepohl
Keyword(s):  
Metal Ions ◽  
Coordination Sphere ◽  
Tertiary Amine ◽  
Cobalt Complexes ◽  
Decay Process ◽  
Oxidation States ◽  
Redox Potentials ◽  
Aerobic Conditions ◽  
High Degree ◽  
Derivatives Of

Bispidine (3,7-diazabicyclo[3.3.1]nonane) ligands, derivatives of diazaadamantane, possess a very rigid backbone and have a high degree of pre-organization for cis-octahedral coordination geometries. Despite their rigidity, they exert a flexible coordination sphere, resulting in stable complexes with a variety of metal ions in various oxidation states. Due to the known high III/II redox potentials of their cobalt complexes, the CoII bispidine complexes are generally resistant to oxidation by dioxygen. Discussed in the present study are various CoII bispidine complexes with tetra- and pentadentate bispidines, with one of these complexes shown to be unstable under aerobic conditions. The decay process has been identified as an oxidative elimination of the 2-methylene pyridine substituent at one of the tertiary amine donors, resulting in picolinate, which is found coordinated to a CoIII product, where the dealkylated N-donor remains unprotonated. The mechanism of this interesting reaction has been studied, and details of the resulting structure of the product complex are discussed.

A High-Resolution NMR Study of Long-Lived Water Molecules in Both Oxidation States of a Minimal Cytochromec†

Biochemistry ◽  
2003 ◽  
Vol 42 (12) ◽  
pp. 3457-3463 ◽  
Author(s):  
Ivano Bertini ◽  
Kaushik Ghosh ◽  
Antonio Rosato ◽  
Paul R. Vasos
Keyword(s):  
High Resolution ◽  
Oxidation States ◽  
Water Molecules ◽  
Nmr Study ◽  
High Resolution Nmr

ReducedN-Alkyl Substituted Bis(imino)pyridine Cobalt Complexes: Molecular and Electronic Structures for Compounds Varying by Three Oxidation States

2010 ◽  
Vol 49 (13) ◽  
pp. 6110-6123 ◽  
Author(s):  
Amanda C. Bowman ◽  
Carsten Milsmann ◽  
Eckhard Bill ◽  
Emil Lobkovsky ◽  
Thomas Weyhermüller ◽  
...  
Keyword(s):  
Electronic Structures ◽  
Cobalt Complexes ◽  
Oxidation States

Monoanionic bis(carbene) pincer complexes featuring cobalt(I–III) oxidation states

2016 ◽  
Vol 45 (24) ◽  
pp. 9805-9811 ◽  
Author(s):  
Abdulrahman D. Ibrahim ◽  
Kenan Tokmic ◽  
Marshall R. Brennan ◽  
Dongyoung Kim ◽  
Ellen M. Matson ◽  
...  
Keyword(s):  
Cobalt Complexes ◽  
Oxidation States ◽  
Pincer Complexes ◽  
Synthesis And Characterization

The synthesis and characterization of a series of cobalt complexes featuring a pincer bis(carbene) ligand of the meta-phenylene-bridged bis-N-heterocyclic carbene (ArCCC, Ar = 2,6-diispropylphenyl or mesityl) are reported.

Using XANES to Monitor the Oxidation State of Cobalt Complexes

2007 ◽  
Vol 60 (3) ◽  
pp. 180 ◽  
Author(s):  
Matthew D. Hall ◽  
Clare K. Underwood ◽  
Timothy W. Failes ◽  
Garry J. Foran ◽  
Trevor W. Hambley
Keyword(s):  
Oxidation State ◽  
Cobalt Complexes ◽  
Reducing Agents ◽  
Oxidation States ◽  
Xanes Spectroscopy ◽  
Edge Structure ◽  
X Ray ◽  
X Ray Absorption

X-Ray absorption near-edge structure (XANES) spectroscopy was used to monitor the oxidation state of cobalt following treatment of CoIII complexes with reducing agents such as ascorbate and cysteine. It was established that the XANES spectra of mixtures of CoII and CoIII complexes can be used to calculate proportions of the two oxidation states by monitoring the height of the Co K-edge. The relationships developed were used to estimate proportions of each complex in solutions of CoIII complexes treated with reducing agents.

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