Synthesis, crystal, molecular and electronic structures of ruthenium complexes with a benzoxazole derivative ligand

Polyhedron ◽  
2012 ◽  
Vol 31 (1) ◽  
pp. 159-166 ◽  
Author(s):  
J.G. Małecki
Keyword(s):  
Electronic Structures ◽  
Ruthenium Complexes

scholarly journals Electronic structures of ruthenium complexes encircling non-innocent ligand assembly

2012 ◽  
Vol 124 (6) ◽  
pp. 1181-1189 ◽  
Author(s):  
AMIT DAS ◽  
DIPANWITA DAS ◽  
TANAYA KUNDU ◽  
GOUTAM KUMAR LAHIRI
Keyword(s):  
Electronic Structures ◽  
Ruthenium Complexes

Ein- und zweikernige Bis(2,2′-bipyridyl)ruthenium-Komplexe mit N,O-Modelliganden für Dehydrogenase-Cofaktoren / Mono- and Binuclear Bis(2,2′-bipyridine)ruthenium Complexes with N,O-Ligands Modelling Dehydrogenase Cofactors

1987 ◽  
Vol 42 (4) ◽  
pp. 425-430 ◽  
Author(s):  
Sylvia Ernst ◽  
Volker Kasack ◽  
Christian Bessenbacher ◽  
Wolfgang Kaim
Keyword(s):  
Unpaired Electron ◽  
Electronic Structures ◽  
Binuclear Complex ◽  
Ruthenium Complexes ◽  
Mononuclear Complex ◽  
Redox Potentials ◽  
Model Compounds ◽  
Chelate Ligands

Abstract Coordination of substitutionally inert [Ru(bpy)2]2+ fragments (bpy: 2,2′-bipyridine) to the a-iminoketone chelate ligands pyrazine-2-dimethylcarboxamide (4) and 4,7-phenanthroline-5,6-dione (5) yields the complexes [(N,O-4)Ru(bpy)2]2⊕, [(O,O′-5⊖)Ru(bpy)2]⊕ and {(N,O; N′,O′-5)[Ru(bpy)2]2}4⊕ which exhibit a rich electrochemistry. The distinctly different electronic structures of the complexes are evident from the ESR behaviour of paramagnetic intermediates: N.O-coordinated complexes have the unpaired electron residing in the ligand n system upon reduction, albeit with g<2 for the binuclear complex of 5. The paramagnetic O,O′-coordinated mononuclear complex with 5 has its redox potentials shifted positively relative to that of the binuclear system. These results are particularly noteworthy because 4 and 5 can be regarded as model compounds for the flavin and methoxatin dehydrogenase cofactors.

Reactions of 7,7,8,8-Tetracyanoquinodimethane (TCNQ) with Alkynyl-Iron- and -Ruthenium Complexes: Synthesis of Ru{C=CC(CN)=C6H4=C(CN)2}(PPh3)2Cp, a New Donor - Acceptor Molecular Array

2012 ◽  
Vol 65 (7) ◽  
pp. 763 ◽  
Author(s):  
Michael I. Bruce ◽  
Alexandre Burgun ◽  
Guillaume Grelaud ◽  
Claude Lapinte ◽  
Brian W. Skelton ◽  
...  
Keyword(s):  
Electronic Structures ◽  
Ruthenium Complexes ◽  
Iron Complex ◽  
Counter Anion ◽  
Similar Treatment ◽  
X Ray ◽  
Vis Spectroscopy ◽  
Donor Acceptor ◽  
Zwitterionic Complex ◽  
Positively Charged

Reactions of 7,7,8,8-tetracyanoquinodimethane (TCNQ) with the alkynyl-iron and ruthenium complexes [M](C≡CR) {[M] = Fe(dppe)Cp*, Ru(PPh3)2Cp; R = H, Ph} are described. The iron complex Fe(C≡CPh)(dppe)Cp* (2a) is oxidized by TCNQ to give the kinetically stable salt [2a•+][TCNQ]•– . Displacement of [TCNQ]•– is achieved by ionic metathesis upon addition of KPF6 to produce [2a•+]PF6. In contrast, Fe(C≡CH)(dppe)Cp* (2b) reacted with TCNQ to give a mixture of compounds containing Fe(=C=CH2)(dppe)Cp* (3a), {Fe(dppe)Cp*}2(μ-C=CHCH=C) (3b), and the zwitterionic complex Fe+{=C=CHC(CN)2C6H4C–(CN)2}(dppe)Cp* (3c). In contrast, the reaction of TCNQ with Ru(C≡CR)(PPh3)2Cp (4a, R = Ph; 4b, R = H) gave selectively the zwitterionic vinylidenes Ru+{=C=CRC(CN)2C6H4C–(CN)2}(PPh3)2Cp (5a, R = Ph; 5b, R = H), in which the Ru centres are positively charged and the counter-anion is located on the further C(CN)2 group. On heating 5b, elimination of HCN affords Ru{C≡CC(CN)=C6H4=C(CN)2}(PPh3)2Cp (1), while similar treatment of 5a gives Ru{η3-C(CN)2CPh=C6H4=C(CN)2}(PPh3)Cp (6) with loss of PPh3. X-ray structures of 1, 5a, and 6, cyclic voltammetry, and UV-vis spectroscopy of 1 provided evidence for the electronic structures of the new complexes.

The Nature of Oxide Surfaces: Topographic and Electronic Structure

1993 ◽  
Vol 51 ◽  
pp. 966-967
Author(s):  
Dawn A. Bonnell ◽  
Yong Liang
Keyword(s):  
Transition Metal Oxides ◽  
Electronic Structures ◽  
Recent Progress ◽  
Spatial Localization ◽  
Level Of Detail ◽  
Scanning Tunneling ◽  
Oxide Surfaces ◽  
Tunneling Microscopy ◽  
Considerable Effort ◽  
Complete Understanding

Recent progress in the application of scanning tunneling microscopy (STM) and tunneling spectroscopy (STS) to oxide surfaces has allowed issues of image formation mechanism and spatial resolution limitations to be addressed. As the STM analyses of oxide surfaces continues, it is becoming clear that the geometric and electronic structures of these surfaces are intrinsically complex. Since STM requires conductivity, the oxides in question are transition metal oxides that accommodate aliovalent dopants or nonstoichiometry to produce mobile carriers. To date, considerable effort has been directed toward probing the structures and reactivities of ZnO polar and nonpolar surfaces, TiO2 (110) and (001) surfaces and the SrTiO3 (001) surface, with a view towards integrating these results with the vast amount of previous surface analysis (LEED and photoemission) to build a more complete understanding of these surfaces. However, the spatial localization of the STM/STS provides a level of detail that leads to conclusions somewhat different from those made earlier.

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