Big Chemical Encyclopedia

Chemical substances, components, reactions, process design ...

Articles Figures Tables About

Electrochemistry, amination

V,/V-bis(2-hydroxy-di-3,5-/-butylphenyl)amine forms complexes of zinc which have ligand-based redox processes with four oxidation levels of the coordinated anion.864 2 1 and 1 1 complexes are formed in the presence of zinc with the 2 1 complex coordinated in an octahedral geometry and the 1 1 complex square planar with a triethylamine ligand completing the coordination sphere. The complexes, at the different redox levels, have been investigated by EPR, spectro-electrochemistry, l I NMR, and magnetochemistry, as appropriate. [Pg.1224]

Jeanmaire D.L., Vanduyne R.P., Surface Raman spectro-electrochemistry. 1. Heterocyclic, aromatic, and aliphatic-amines adsorbed on anodized silver electrode, J. Electroanal. Chem. 1977 84 1-20. [Pg.253]

The electrochemistry of dioxoruthenium(VI) and dioxoosmium(VI) complexes with polypyridyl and macrocyclic tertiary amine ligands has been extensively studied by cyclic voltammetric techniques. In general, cA-dioxo species have higher reduction potentials than the corresponding trans-Aiaxo species. " " For the trans-Aioxo species, the d, orbital ordering... [Pg.777]

The electrochemistry of dioxoosmium(VI) complexes has also been extensively studied. The tra 5-dioxoosmium(VI) complexes of polypyridyl and macrocyclic tertiary amine ligands display very similar proton-coupled electron transfer couples. In aqueous solutions at pH < 5-7 the cyclic voltammograms of n-a i-[0s (0)2(bpy)2] show a remarkable reversible three-electron couple and a one-electron Os coimle. In the Pourbaix diagram two break points are observed in the pH dependence of the Os couple, which correspond to the pAa values of Os —OH2 and Os —(OHXOH2) (Figure 10). The redox reactions are shown in Equations (41)-(43). At pH >8 the 3e Os wave splits into a pH-independent le Os wave and a 2e/2H" Os wave (Equations (44) and (45)). [Pg.783]

LA Allison, GS Mayer, RE Shoup. o-Phthalaldehyde derivatives of amines for high-speed liquid chromatography/electrochemistry. Anal Chem 56 1089-1096, 1984. [Pg.98]

Examples of such irreversible species (12) include hydroxyl amine, hydroxide, and perchlorate. The electrochemistries of dichromate and thiosulfate are also irreversible. The presence of any of these agents may compromise an analysis by generating currents in excess of the analytically useful values. This problem can be avoided if the chemical reaction is slow enough, or if the electrode can be rotated fast enough so that the reaction does not occur within the Nemst diffusion layer and therefore does not influence the current. [Pg.54]

Three techniques have been utilized to promote generation of an azomethine ylid from bis(trimethylsilmethyl)amines photochemistry, chemistry with silver fluoride and electrochemistry. [Pg.330]

Although hydronium ion (H30+) (Chapter 8) and dioxygen (02) (Chapter 9) are the most studied of the molecules and ions without metal atoms, several of the molecules that contain sulfur, nitrogen, or carbon also are electroactive. The results for representative examples are presented to illustrate the utility of electrochemical measurements for die evaluation of the redox thermodynamics and bond energies for non-metal-containing molecules. In particular, die electrochemistry for several sulfur compounds [S8, S02, HS(CH2)3SH], nitrogen compounds [-NO, HON=0, N20, H2NOH, hydrazines (/ NHNH/ ), amines, phenazine], and carbon compounds (C02, CO, NCT) is summarized and interpreted. [Pg.420]

Other aliphatic bases (amines and thiols) are oxidized by similar pathways their electrochemistry is discussed to a limited extent in Chapter 11. [Pg.458]

The electrochemistry of both rans-dioxoosmium(VI) and rutheni-um(VI) macrocyclic tertiary amine complexes has been studied in great detail. Both trans-[RuVI(b)2(0)2]2+ and rans-[RuVI(14TMC)(0)2]2 + and its related complexes display similar cyclic voltammograms in aqueous solution (132, 212). At pH < 7, three reversible/quasi-reversible redox couples, corresponding to the redox reactions are observed ... [Pg.279]

A thorough review of aliphatic and aromatic amine electrochemistry has been written by Nelson (21). [Pg.74]


See other pages where Electrochemistry, amination is mentioned: [Pg.754]    [Pg.309]    [Pg.1007]    [Pg.35]    [Pg.20]    [Pg.439]    [Pg.504]    [Pg.1219]    [Pg.100]    [Pg.194]    [Pg.853]    [Pg.279]    [Pg.282]    [Pg.29]    [Pg.31]    [Pg.100]    [Pg.492]    [Pg.1065]    [Pg.236]    [Pg.155]    [Pg.534]    [Pg.251]    [Pg.1087]    [Pg.67]    [Pg.187]    [Pg.127]    [Pg.95]    [Pg.131]    [Pg.99]    [Pg.324]    [Pg.326]    [Pg.91]    [Pg.185]    [Pg.224]    [Pg.224]   
See also in sourсe #XX -- [ Pg.975 ]




SEARCH



Amines electrochemistry

Aromatic amine electrochemistry

© 2024 chempedia.info