scholarly journals Cobalt complexes of the chelating dicarboxylate ligand “esp”: a paddlewheel-type dimer and a heptanuclear coordination cluster

2018 ◽  
Vol 47 (39) ◽  
pp. 13887-13893 ◽  
Author(s):  
Ryan J. Pakula ◽  
John F. Berry
Keyword(s):  
High Spin ◽  
Cobalt Complexes ◽  
Cluster Complex ◽  
Dicarboxylate Ligand

Reaction of CoCO3 with α,α,α′,α′-tetramethyl-1,3-benzenedipropionic acid (H2esp) in EtOH forms the paddlewheel-type dimer Co2(esp)2(EtOH)2, which hydrolyzes in MeCN to give a bowl-shaped heptacobalt coordination cluster complex; both compounds display antiferromagnetic interactions between high-spin Co(ii) ions.

scholarly journals Imido Cobalt Complexes with Imidyl Character

2021 ◽  
Author(s):  
alexander Reckziegel ◽  
Manjinder Kour ◽  
Beatrice Battistella ◽  
Stefan Mebs ◽  
Katrin Beuthert ◽  
...  
Keyword(s):  
Electronic Structure ◽  
Spin Density ◽  
High Spin ◽  
Bond Activation ◽  
High Spin State ◽  
Cobalt Complexes ◽  
Spectroscopic Methods ◽  
Computational Studies ◽  
Ancillary Ligand ◽  
Unpaired Spin

We report on the synthesis of a variety of trigonal imido cobalt complexes [Co(NAryl)L<sub>2</sub>)<sup>–</sup>, (L = N(Dipp)SiMe<sub>3</sub>), Dipp = 2,6-diisopropylphenyl) bearing very long Co–NAryl bonds of around 1.75 Å. The electronic structure was interrogated using a variety of physical and spectroscopic methods indicating the first authenticated examples of cobalt bound imidyl species. Computational studies corroborate these findings and reveal that the high-spin state of these complexes gives rise to unpaired spin-density on the imide nitrogen and leads to its imidyl character. Obtained complexes are capable of intermolecular H atom abstraction from C–H bonds that yields the corresponding cobalt amides. Exchange of the Dipp-substituent on the imide by the smaller mesityl function (2,4,6-trimethylphenyl) effectuates the unexpected Me<sub>3</sub>Si shift from the ancillary ligand set to the imide nitrogen, followed by intramolecular C–H bond activation.<br>

Redox Pairs of Diiron and Iron–Cobalt Complexes with High-Spin Ground States

2016 ◽  
Vol 55 (19) ◽  
pp. 9725-9735 ◽  
Author(s):  
Deanna L. Miller ◽  
Randall B. Siedschlag ◽  
Laura J. Clouston ◽  
Victor G. Young ◽  
Yu-Sheng Chen ◽  
...  
Keyword(s):  
High Spin ◽  
Ground States ◽  
Cobalt Complexes ◽  
Iron Cobalt

High Spin Cobalt Complexes Supported by a Trigonal Tris(Phosphinimide) Ligand

2021 ◽  
Author(s):  
Heui Beom Lee ◽  
Nicholas Ciolkowski ◽  
Charles Winslow ◽  
Jonathan Rittle
Keyword(s):  
High Spin ◽  
Cobalt Complexes

scholarly journals Imido Cobalt Complexes with Imidyl Character

2021 ◽  
Author(s):  
alexander Reckziegel ◽  
Manjinder Kour ◽  
Beatrice Battistella ◽  
Stefan Mebs ◽  
Katrin Beuthert ◽  
...  
Keyword(s):  
Electronic Structure ◽  
Spin Density ◽  
High Spin ◽  
Bond Activation ◽  
High Spin State ◽  
Cobalt Complexes ◽  
Spectroscopic Methods ◽  
Computational Studies ◽  
Ancillary Ligand ◽  
Unpaired Spin

We report on the synthesis of a variety of trigonal imido cobalt complexes [Co(NAryl)L<sub>2</sub>)<sup>–</sup>, (L = N(Dipp)SiMe<sub>3</sub>), Dipp = 2,6-diisopropylphenyl) bearing very long Co–NAryl bonds of around 1.75 Å. The electronic structure was interrogated using a variety of physical and spectroscopic methods indicating the first authenticated examples of cobalt bound imidyl species. Computational studies corroborate these findings and reveal that the high-spin state of these complexes gives rise to unpaired spin-density on the imide nitrogen and leads to its imidyl character. Obtained complexes are capable of intermolecular H atom abstraction from C–H bonds that yields the corresponding cobalt amides. Exchange of the Dipp-substituent on the imide by the smaller mesityl function (2,4,6-trimethylphenyl) effectuates the unexpected Me<sub>3</sub>Si shift from the ancillary ligand set to the imide nitrogen, followed by intramolecular C–H bond activation.<br>

scholarly journals High Spin Cobalt Complexes Supported by a Trigonal Tris(Phosphinimide) Ligand

2021 ◽  
Author(s):  
Heui Beom Lee ◽  
Nicholas Ciolkowski ◽  
Charles Winslow ◽  
Jonathan Rittle
Keyword(s):  
High Spin ◽  
Cobalt Complexes

scholarly journals High‐Spin Imido Cobalt Complexes with Imidyl Radical Character

2021 ◽  
Author(s):  
Alexander Reckziegel ◽  
Manjinder Kour ◽  
Beatrice Batistella ◽  
Stefan Mebs ◽  
Katrin Beuthert ◽  
...  
Keyword(s):  
High Spin ◽  
Cobalt Complexes ◽  
Radical Character

scholarly journals High‐Spin Imido Cobalt Complexes with Imidyl Radical Character

2021 ◽  
Author(s):  
Alexander Reckziegel ◽  
Manjinder Kour ◽  
Beatrice Batistella ◽  
Stefan Mebs ◽  
Katrin Beuthert ◽  
...  
Keyword(s):  
High Spin ◽  
Cobalt Complexes ◽  
Radical Character

Mixed-Valent Dicobalt and Iron–Cobalt Complexes with High-Spin Configurations and Short Metal–Metal Bonds

2013 ◽  
Vol 52 (16) ◽  
pp. 9216-9228 ◽  
Author(s):  
Christopher M. Zall ◽  
Laura J. Clouston ◽  
Victor G. Young ◽  
Keying Ding ◽  
Hyun Jung Kim ◽  
...  
Keyword(s):  
High Spin ◽  
Cobalt Complexes ◽  
Iron Cobalt ◽  
Metal Metal ◽  
Metal Metal Bonds ◽  
Metal Bonds

Evidence for high-spin-to-low-spin transition under pressure in Fe 72 Pt 28 Invar alloy

2000 ◽  
Vol 80 (2) ◽  
pp. 155-163 ◽  
Author(s):  
S. Odin, F. Baudelet, E. Dartyge, J. P
Keyword(s):  
High Spin ◽  
Spin Transition ◽  
Invar Alloy
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