Analytical applications of mixed-ligand complexes

Véber, M.; Csányi, László J.

doi:10.1016/0026-265x(77)90094-7

Cited by 10 publications

(2 citation statements)

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“…Some electroinactive metals can be determined indirectly by forming complexes with electroactive organic dyes [2-41. Xylenol orange (XO), a dye which has the following structure, is important for determination of hydrogen peroxide [in a mixed complex of titanium(N), XO, and hydrogen peroxide] [5] and for the sensitive polarographic determination of europium [6]. c l so;…”

Section: L7ttroductionmentioning

confidence: 99%

UV‐visible and ESR spectroelectrochemical study of xylenol orange

Dong

Song

1989

Electroanalysis

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The proposed first step in the electroreduction of xylenol orange (XO), a reversible electrode process coupled with a chemical reaction, is based on ultraviolet (UV)-visible spectroelectrochemistry. Electrochemical excitation-electron spin resonance (ESR) in situ measurements are used to observe the radical signal produced by the first step reduction of XO. The ESR spectra of the radical in solution at pH 4.0, 4.5, and 5.0 have the same characteristics: no observed hyperfine structure, a line width of 10.5 G, and a g value of 2.0034. The structure of the XO radical and its disproportionation reaction are elucidated. l7tTRODUCTIONMany organic dyes are widely used in electroanalytical chemistry [ 11. Some electroinactive metals can be determined indirectly by forming complexes with electroactive organic dyes c l so;The electrode process of XO at a mercury electrode was investigated by Veber and Csanyi 171. It was proposed that XO undergoes two electron-transfer steps, with step 1 being nearly reversible and followed by a chemical reduction and step 2 being strongly irreversible. The first I To whom correspondence should be addressed step is, in fact, more important for most electroanalytical applications. No additional information is available on the first electroreduction step (especially on the structure of the XO radical and the nature of the following chemical reaction). Spectroelectrochemical investigations dealing with basic triphenylmethane dyes have rarely been reported. This article explores the electrode process of XO by using in situ ultraviolet (W)-visible and electron spin resonance (ESR) spectroelectrochemical methods as well as cyclic voltammetry. EXPERIMENTAL InstrumentationAn electron spin resonance spectrometer (Japan, JES-FE-3AX, x band, 100 kHz modulation, TJhI microwave resonance cavity) was combined with an FA-1 model voltammeter made by our laboratory for carrying out the in situ ESK spectroelectrochemical measurements. The IN-visible spectroelectrochemical equipment consisted o f a DMS-90 UV-visible spectropliotometer (Varian Instrument Co., Palo Alto, a) and a 1'MC nlodel 173 potentiostat. Both the ESK-electrocheniicaI cell and the gold minigrid optically transparent thin-layer cell were described previously [ 8, 91. All potentials were measured against an Ag/AgCI (saturated KCI solution) reference electrode. The experiments were performed ;it 20°C. ReagentsAnalytical grade xylenol orange was used without further purification. Other chemicals were also of analytical grade. All of the solutions were prepared with twice-distilled water. The test solutions were purged with pure 0 1989 VCH Publishers, Inc

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Section: L7ttroductionmentioning

confidence: 99%

UV‐visible and ESR spectroelectrochemical study of xylenol orange

Dong

Song

1989

Electroanalysis

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“…Acridine orange [492] Hydrazides 2,3-Dichloro-1,4-naphthoquinone 17-Hydroxycorticoids Cu(OAc)2, pyrrole, MeOH (C6H6) [587][588][589][590][591][592][593][594][595][596][597][598][599][600] 8-Hydroxyquinoline Ar-2,6-Trichloro-p-benzoquinoneimine [625; 2-7 ppm] Iminodiacetic acid Dual wavelength tech. : Ferric alum [250,300] Isoprenaline sulfate Pharmaceuticals Thiosemicarbazide [490; 2-16 ppm] Ketohexoses HC104, urea [605] Lactic acid Blood Lactate dehydrogenase to form NADH [340] Lipids, total Serum p-(Dimethylamino)benzaldehyde [540] Malonate Diazotized p-nitroaniline [445 ] Methylene blue Ammonium hexanitratocerate (nitrobenzene) [545] Methyl glyoxal 2,4-Dinitrophenylhydrazine [432; 3.4 X 104] m-Nitro compds.…”

Section: Serummentioning

confidence: 99%