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• W2057114534 endingPage "4088" @default.
• W2057114534 startingPage "4078" @default.
• W2057114534 abstract "A series of species [RuIII(NH3)4(Cat-R)]n+ have been synthesized where Cat-R is a catecholate dianion having the substituent R = CO2−, CO2H, OMe or H. These so-called parent species were characterized by their electronic spectra, FTIR, mass spectrum, cyclic voltammetry and EPR. Controlled potential reduction yields [RuII(NH3)4(Cat-R)](n − 1)+ while controlled potential oxidation yields [RuII(NH3)4(Q-R)](n + 1)+ (Q-R = substituted quinone). Density Functional Theory (DFT) was primarily used to explore the electronic structures of these complexes. Application of the INDO semi-empirical model proved less useful. Time dependent density functional response theory was used to calculate the electronic spectra of the species with R = H. The electronic spectra of the closed shell species are well reproduced by the calculations. The physical properties of these complexes indicate a charge delocalized system reminiscent of a delocalized organic molecule. The simple valence descriptions noted above are convenient to use but do not reflect the actual electronic structure. The electronic spectra of the parent species are temperature dependent. The visible region charge transfer band shifts by about 1500 cm−1 to higher energy in acidic media at liquid nitrogen temperature. This is interpreted in terms of solvent effects rather than valence tautomerism. The electrochemical properties of [RuIII(NH3)4(Cat-R)], in aqueous solution, reveal the first example of a reversible and stable Ru–quinone species in that medium. The pKa values for several dioxolene species, with R = CO2−, are derived from a Pourbaix diagram." @default.
• W2057114534 created "2016-06-24" @default.
• W2057114534 creator A5027371391 @default.
• W2057114534 creator A5052155748 @default.
• W2057114534 creator A5079189117 @default.
• W2057114534 creator A5080894267 @default.
• W2057114534 creator A5081538067 @default.
• W2057114534 date "2000-01-01" @default.
• W2057114534 modified "2023-10-16" @default.
• W2057114534 title "Synthesis, spectral and redox properties of tetraammine dioxolene ruthenium complexes †" @default.
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