Tuning redox potentials of bis(imino)pyridine cobalt complexes: an experimental and theoretical study involving solvent and ligand effects

2012 ◽  
Vol 41 (12) ◽  
pp. 3562 ◽  
Author(s):  
C. Moyses Araujo ◽  
Mark D. Doherty ◽  
Steven J. Konezny ◽  
Oana R. Luca ◽  
Alex Usyatinsky ◽  
...  
Keyword(s):  
Theoretical Study ◽  
Cobalt Complexes ◽  
Redox Potentials ◽  
Ligand Effects

scholarly journals Substitution Effect on the Charge Transfer Processes in Organo-Imido Lindqvist-Polyoxomolybdate

Molecules ◽  
2018 ◽  
Vol 24 (1) ◽  
pp. 44 ◽  
Author(s):  
Patricio Hermosilla-Ibáñez ◽  
Kerry Wrighton-Araneda ◽  
Walter Cañón-Mancisidor ◽  
Marlen Gutiérrez-Cutiño ◽  
Verónica Paredes-García ◽  
...  
Keyword(s):  
Charge Transfer ◽  
Theoretical Study ◽  
Bathochromic Shift ◽  
Substitution Effect ◽  
Spectroscopic Properties ◽  
Electrochemical Studies ◽  
Redox Potentials ◽  
Metal Centre ◽  
Transfer Processes ◽  
Organic Fragment

Two new aromatic organo-imido polyoxometalates with an electron donor triazole group ([n-Bu4N]2[Mo6O18NC6H4N3C2H2]) (1) and a highly conjugated fluorene ([n-Bu4N]2[Mo6O18NC13H9]) (2) have been obtained. The electrochemical and spectroscopic properties of several organo-imido systems were studied. These properties were analysed by the theoretical study of the redox potentials and by means of the excitation analysis, in order to understand the effect on the substitution of the organo-imido fragment and the effect of the interaction to a metal centre. Our results show a bathochromic shift related to the charge transfer processes induced by the increase of the conjugated character of the organic fragment. The cathodic shift obtained from the electrochemical studies reflects that the electronic communication and conjugation between the organic and inorganic fragments is the main reason of this phenomenon.

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.

Ligand effects on the redox potentials of metal carbonyls

Polyhedron ◽  
1983 ◽  
Vol 2 (9) ◽  
pp. 929-934 ◽  
Author(s):  
J.W. Hershberger ◽  
J.K. Kochi
Keyword(s):  
Redox Potentials ◽  
Metal Carbonyls ◽  
Ligand Effects

scholarly journals Theoretical study of cobalt and nickel complexes involved in methyl transfer reactions: structures, redox potentials and methyl binding energies

2019 ◽  
Vol 30 (5) ◽  
pp. 1957-1970
Author(s):  
Patrycja Sitek ◽  
Aleksandra Chmielowska ◽  
Maria Jaworska ◽  
Piotr Lodowski ◽  
Marzena Szczepańska
Keyword(s):  
Theoretical Study ◽  
Nickel Complexes ◽  
Binding Energies ◽  
Transfer Reactions ◽  
Redox Potentials ◽  
Methyl Transfer ◽  
Cobalt And Nickel

An integrated experimental and theoretical study on the optical properties of uniform hairy noble metal nanoparticles

Nanoscale ◽  
2018 ◽  
Vol 10 (48) ◽  
pp. 22750-22757 ◽  
Author(s):  
Di Yang ◽  
Yihuang Chen ◽  
Hongshang Peng ◽  
Gengxiang Chen ◽  
Zhiqun Lin
Keyword(s):  
Optical Properties ◽  
Metal Nanoparticles ◽  
Noble Metal ◽  
Theoretical Study ◽  
Noble Metal Nanoparticles ◽  
Ligand Effects ◽  
Surface Ligand ◽  
Modeling Study

An integrated experimental and modeling study reveals the contributions of intra- and inter-band transitions and the size and surface ligand effects on plasmonic absorption.

Structure and electrochemical properties of (μ-O)2Mn2(iii,iii) and (μ-O)2Mn2(iii,iv) complexes supported by pyridine-, quinoline-, isoquinoline- and quinoxaline-based tetranitrogen ligands

2021 ◽  
Vol 50 (12) ◽  
pp. 4133-4144
Author(s):  
Yuji Mikata ◽  
Yasuko Kuroda ◽  
Kyoko Naito ◽  
Kana Murakami ◽  
Chihiro Yamamoto ◽  
...  
Keyword(s):  
Electrochemical Properties ◽  
Structural Parameters ◽  
Redox Potentials ◽  
Systematic Comparison ◽  
Ligand Effects

A systematic comparison of a total of 14 complexes bearing a (μ-O)2Mn2 core with tetranitrogen ligands reveals small but solid relationships between structural parameters and redox potentials induced by ligand effects.

Theoretical Study of One-electron Redox Potentials of Some NADH Model Compounds

2010 ◽  
Vol 28 (1) ◽  
pp. 72-80 ◽  
Author(s):  
Huajing Wang ◽  
Xiongyi Huang ◽  
Rong Shen ◽  
Lei Rui ◽  
Yao Fu
Keyword(s):  
Theoretical Study ◽  
Redox Potentials ◽  
Model Compounds
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