scholarly journals FIRST COORDINATION SPHERE AND SPIN-STATE IN SPIN CROSS-OVER IRON AND COBALT COMPLEXES

1986 ◽  
Vol 47 (C8) ◽  
pp. C8-563-C8-568 ◽  
Author(s):  
C. CARTIER ◽  
P. THUERY ◽  
M. VERDAGUER ◽  
J. ZAREMBOWITCH ◽  
A. MICHALOWICZ
Keyword(s):  
Coordination Sphere ◽  
Spin State ◽  
Cobalt Complexes

Tuning the Spin State of Cobalt in a Co-La Heterometallic Complex through Controllable Coordination Sphere of La

2011 ◽  
Vol 123 (24) ◽  
pp. 5618-5622 ◽  
Author(s):  
Song-Song Bao ◽  
Yi Liao ◽  
Yan-Hui Su ◽  
Xu Liang ◽  
Feng-Chun Hu ◽  
...  
Keyword(s):  
Coordination Sphere ◽  
Spin State ◽  
Heterometallic Complex

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.

scholarly journals Spin transition in a ferrous chloride complex supported by a pentapyridine ligand

2020 ◽  
Vol 56 (18) ◽  
pp. 2703-2706
Author(s):  
Manuel Boniolo ◽  
Sergii I. Shylin ◽  
Petko Chernev ◽  
Mun Hon Cheah ◽  
Philipp A. Heizmann ◽  
...  
Keyword(s):  
High Spin ◽  
Coordination Sphere ◽  
Spin State ◽  
Spin Transition ◽  
Chloride Complex ◽  
Ferrous Chloride ◽  
High Spin Complex ◽  
Spin Complex

Apparent high-spin complex with FeN5Cl coordination sphere exhibits a complete transition to the low-spin state on cooling.

Tuning the Spin State of Cobalt in a Co-La Heterometallic Complex through Controllable Coordination Sphere of La

2011 ◽  
Vol 50 (24) ◽  
pp. 5504-5508 ◽  
Author(s):  
Song-Song Bao ◽  
Yi Liao ◽  
Yan-Hui Su ◽  
Xu Liang ◽  
Feng-Chun Hu ◽  
...  
Keyword(s):  
Coordination Sphere ◽  
Spin State ◽  
Heterometallic Complex

Cobalt Complexes Containing Pendant Amines in the Second Coordination Sphere as Electrocatalysts for H2 Production

2014 ◽  
Vol 33 (20) ◽  
pp. 5820-5833 ◽  
Author(s):  
Ming Fang ◽  
Eric S. Wiedner ◽  
William G. Dougherty ◽  
W. Scott Kassel ◽  
Tianbiao Liu ◽  
...  
Keyword(s):  
Coordination Sphere ◽  
Cobalt Complexes ◽  
H2 Production ◽  
Second Coordination Sphere

scholarly journals Controlling the nuclearity and topology of cobalt complexes through hydration at the ppm level

2020 ◽  
Vol 8 (13) ◽  
pp. 4401-4407 ◽  
Author(s):  
Raúl Castañeda ◽  
Mathieu Rouzières ◽  
Rodolphe Clérac ◽  
Jaclyn L. Brusso
Keyword(s):  
Spin State ◽  
Cobalt Complexes ◽  
Level Control ◽  
Cobalt Ions ◽  
Degree Of Hydration ◽  
And Topology ◽  
Magnetic Analysis ◽  
Ppm Level

Polynuclear cobalt complexes in which nuclearity and topology can be controlled via ppm level control over the degree of hydration (300 vs. 10 000 ppm). Structural and magnetic analysis were used to elucidate the spin state of the cobalt ions.

Tuning the oxidation state and magnetic and coordination behaviour of iron and cobalt complexes by O/S variation in mono-thio and dithio-oxamide chelating ligands

2015 ◽  
Vol 39 (6) ◽  
pp. 4716-4725 ◽  
Author(s):  
Luca Pilia ◽  
Davide Espa ◽  
Giorgio Concas ◽  
Francesco Congiu ◽  
Luciano Marchiò ◽  
...  
Keyword(s):  
Oxidation State ◽  
Spin State ◽  
Cobalt Complexes ◽  
Chelating Ligands ◽  
Metal Oxidation ◽  
Coordination Behaviour

A variety of iron and cobalt complexes which differ in coordination, metal oxidation state, and spin state is obtained with corresponding S,O and S,S′ title ligands.

Cobaloxime-Based Double Complex Salts as Efficient and Versatile Catalysts for the Light-Driven Hydrogen Evolution Reaction

2020 ◽  
Author(s):  
Elisabeth Hofmeister ◽  
Jisoo Woo ◽  
Tobias Ullrich ◽  
Lydia Petermann ◽  
Kevin Hanus ◽  
...  
Keyword(s):  
Hydrogen Evolution ◽  
Hydrogen Evolution Reaction ◽  
Systematic Study ◽  
Cobalt Complexes ◽  
Spectroscopic Studies ◽  
Double Complex ◽  
Double Complex Salts ◽  
Noble Metal Catalysts ◽  
Reduction Potentials ◽  
Complex Salts

Cobaloximes and their BF<sub>2</sub>-bridged analogues have emerged as promising non-noble metal catalysts for the photocatalytic hydrogen evolution reaction (HER). Herein we report the serendipitous discovery that double complex salts such as [Co(dmgh)<sub>2</sub>py<sub>2</sub>]<sup>+</sup>[Co(dmgBPh<sub>2</sub>)<sub>2</sub>Cl<sub>2</sub>]<sup>-</sup> can be obtained in good yields by treatment of commercially available [Co(dmgh)<sub>2</sub>pyCl] with triarylboranes. A systematic study on the use of such double complex salts and their single salts with simple counterions as photocatalysts revealed HER activities comparable or superior to existing cobaloxime catalysts and suggests ample opportunities for this compound class in catalyst/photosensitizer dyads and immobilized architectures. Preliminary electrochemical and spectroscopic studies indicate that one key advantage of these charged cobalt complexes is that the reduction potentials as well as the electrostatic interaction with charged photosensitizers can be tuned.

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