Electronic properties of hydroquinone-containing ruthenium complexes in different oxidation states

1997 ◽  
pp. 1627-1632 ◽  
Author(s):  
Tia E. Keyes ◽  
Pradeep M. Jayaweera ◽  
John J. McGarvey ◽  
Johannes G. Vos
Keyword(s):  
Electronic Properties ◽  
Ruthenium Complexes ◽  
Oxidation States

A STRUCTURAL CHEMICAL MODEL FOR HIGH Tc CERAMIC SUPERCONDUCTORS

1987 ◽  
Vol 01 (07n08) ◽  
pp. 275-288 ◽  
Author(s):  
S.R. OVSHINSKY ◽  
S.J. HUDGENS ◽  
R.L. LINTVEDT ◽  
D.B. RORABACHER
Keyword(s):  
Electronic Properties ◽  
Oxygen Vacancies ◽  
Oxygen Removal ◽  
Bose Condensation ◽  
Oxidation States ◽  
Chemical Model ◽  
Electrically Conductive ◽  
High Tc ◽  
Ceramic Superconductors ◽  
Mixed Oxidation

A structual chemical model for high Tc ceramic superconductors is proposed in which carriers pairs, coupled through a superexchange process, undergo Bose condensation. In the Y-Ba-Cu-O system, Cu atoms on “chain” sites and “sheet” sites are initially assigned formal oxidation states of +3 and +2, respectively, and “sheet”/“chain” interactions are then introduced to bring about the electrically conductive mixed oxidation state. This model explains the presence of labile oxygen in the “chain” structures, describes the structure of deoxygenated phases exhibiting ordered oxygen vacancies in the “chains”, and allows interpretation of the effects of oxygen removal on magnetic and electronic properties of the material.

Electronic Properties of some Ternary and Quaternary Oxides of the VIII B and I B Transition Elements: Application to High Tc Superconductivity

1989 ◽  
Vol 156 ◽  
Author(s):  
M. Pouchard ◽  
J-C. Grenier ◽  
J-P. Doumerc ◽  
G. Demazeau ◽  
J-P. Chaminade ◽  
...  
Keyword(s):  
Electronic Properties ◽  
Structural Parameters ◽  
Mixed Valence ◽  
Oxidation States ◽  
Transition Elements ◽  
High Tc Superconductors ◽  
High Tc ◽  
Electronic Configurations ◽  
Spin Electronic ◽  
Mixed Valence Compounds

ABSTRACTIn the scope of the Goodenough model, a brief review of the electronic properties of some 3d transition elements (M = Fe, Co, Ni and Cu ) is given; the main relevant electronic and structural parameters are emphasized. Then a special attention is focussed on N/(N−1) and N/(N−2) electron mixed valence compounds.Finally some particular features of copper are discussed and their relevance to high Tc superconductors is pointed out:-the srong covalency of Cu-O bondings involving a possible delocalization of the hole between trivalent copper and oxygen,-the existence of low and high spin electronic configurations for CuIII,-the disproportionation of Cu2+ and its role in the formation of hole pairs,Cu-O distances very close for the three successive oxidation states of copper favouring the disproportionation process.

Ruthenium complexes bearing π-extended pyrrolo-styryl-bipyridine ligand: electronic properties and evaluation as photosensitizers

2009 ◽  
pp. 63-70 ◽  
Author(s):  
Arnald Grabulosa ◽  
David Martineau ◽  
Marc Beley ◽  
Philippe C. Gros ◽  
Silvia Cazzanti ◽  
...  
Keyword(s):  
Electronic Properties ◽  
Ruthenium Complexes ◽  
Bipyridine Ligand
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