Control of orbital mixing in ruthenium complexes containing quinone-related ligands

Abstract

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The trans–cis isomerisation of bis(dioxolene)bis(pyridine) ruthenium complexes

“…The electronic spectra support previous assignments given for the corresponding cis-bpy complexes (6). Detailed analysis further corroborates earlier arguments (5)(6)(7)21) concerning the degree of mixing between metal and ligand orbitals and the formal oxidation states of the species.…”

Ruthenium-azoimine-chloranilates Synthesis, Spectra and Electrochemistry of Ruthenium(II)-1-alkyl-2-(arylazo)imidazole-chloranilate Complexes

“…A common feature of the metal-RQ chemistry is the delocalization of active electrons beween the metal and the quinonoid ligand. Thus transition metals are good candidates to stabilize different redox states of the quinonoid system [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18]. This is mainly due to the closer energy of quinonoid based ligands to those of metal based dporbitals and recently much effort has been devoted to the study of the electrochemical and spectroscopic properties of ruthenium complexes.…”

“…This is mainly due to the closer energy of quinonoid based ligands to those of metal based dporbitals and recently much effort has been devoted to the study of the electrochemical and spectroscopic properties of ruthenium complexes. The presence of p-acidic coligands like CO, [4] pyridines (R-Py), a-diimines (bpy, phen, tpy), [5][6][7][8][9][10][11][12][13][14][15] PPh 3 , [2,3,16] and 2-(arylazo)pyridines [17] efficiently control the energy of metal dp levels. As a result of this, the electron delocalisation between ruthenium and RQ is perturbed in the mixed ligand complexes.…”

“…As a result of this, the electron delocalisation between ruthenium and RQ is perturbed in the mixed ligand complexes. Various approaches have been chosen to establish the participation of metal, coligand and RQ orbitals in the spectroscopic and redox states [9][10][11][12][13]. The modification has been carried out by the synthesis of the ruthenium-RQ system using electron donor/acceptor coligands.…”

Synthesis and Characterization of Some Transition Metal Complexes of 2-Amino-3-hydroxypyridine and its Application in Corrosion Inhibition

“…1; H is the dissociable hydroxy proton) is of interest since its anion chelates metal ions as a bidentate N,O donor forming ®ve membered rings like that of 2-aminophenol [1,2] (Fig. 2).…”