- Chemodosimeter for CN- - Interplay between experiment and theory
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The reaction-based cost effective detection of CN- over the most competitive ions, F- and Ac-, by a commercially available dye has been developed. The experimental results are in good agreement with the theory. An application in the form of 'dip-sticks' which provides an instant information, has been demonstrated.
- Kaur, Paramjit,Sareen, Divya,Singh, Kamaljit
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supporting information; experimental part
p. 9607 - 9610
(2012/08/28)
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- Conformational Change Forced by Cesium Ion Complexation in Crystal Violet Derivative Possessing Tris(monoaza-15-crown-5) Structure
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A Crystal Violet derivative incorporating a tris(monoaza-15-crown-5) structure exhibits an anomalous absorbance change in the absorption spectrum of its acetonitrile solution, which was induced only by cesium ion but not by other alkali metal ions. A consideration about its complex conformation explains the cesium ion specificity and a molecular orbital calculation suggests the correlation between the conformation and absorbance.
- Uda, Ryoko M.,Oue, Masatoshi,Kimura, Keiichi
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p. 1236 - 1237
(2007/10/03)
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- Photochemistry and photophysics of triarylmethane dye leuconitriles
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The photochemical reactions of crystal violet leuconitrile (CVCN) were investigated by the means of product analysis and trapping experiments, laser flash and steady-state photolysis, and steady-state fluorescence. The influence of oxygen on the reaction was examined in detail. The photochemistry of malachite green leuconitrile (MGCN), basic fuchsin leuconitrile (BFCN), and crystal violet leucomethyl (CVMe) and leucobenzyl (CVBn), as well as triphenylacetonitrile, was studied. The results suggest ionization occurs from S1, while the di-π-methane reaction is the photochemical route from T1.
- Jarikov,Neckers
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p. 659 - 671
(2007/10/03)
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- CARBON-CARBON BOND FORMATION BY COORDINATION OF CARBOCATIONS WITH CARBANIONS.
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Direct attack of resonance-stabilized carbenium ions and carbanions can be regulated to provide a wide range of rates and equilibria for the study of carbon-carbon bond formation.
- Arnett, Edward M.,Troughton, E. B.
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p. 3299 - 3302
(2007/10/02)
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- APPLICATION OF ELECTROSTATIC THEORY TO THE KINETICS OF THE FORMATION OF LEUCONITRILES OF THE TRIARYLMETHANE SERIES IN THE WATER-DIOXANE SOLVENT SYSTEM
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The kinetics of the reaction of conjugated ions of the triphenylmethane series and their antipyrine analogs, which differ in the type of charge, with the cyanide ion in the water-dioxane system (0-22.6 wt. percent dioxane) at 20-40 deg C were studied by a spectrophotometric method.It was established that the effect of the mixed solvent on the rate constants and the activation parameters of the reactions corresponds fully to the predictions of electrostatic theory, which takes account of the dependence of the radii of the activated complex on temperature.
- Sinev, V. V.,Nikolova, T. A.
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p. 666 - 671
(2007/10/02)
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- KINETICS OF THE FORMATION OF LEUCO NITRILES OF THE TRIARYLMETHANE SERIES IN BINARY AQUEOUS-ORGANIC SOLVENT
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The kinetics of the formation of leuco nitriles of the triarylmethane series in binary water-dioxane and water-acetonitrile solvent systems was investigated by a spectrophotometric method.It was shown that the effect of the above mentioned mixed solvents on the rate constants of the reactions obeys electrostatic theory over the whole investigated range of dielectric constants. (The variation range of ε amounted to 50-80.) On the basis of the concept of transsolvation of the carbonium center and on the relay mechanism of the reaction of the OH(1-) ion with water molecules, contained in the hydrate sphere of the reaction center conditions under which electrostatic theory must be expected to apply to the kinetics of the reactions involving conjugated carbonium ions in mixed solvents were formulated.
- Sinev, V. V.,Nikolova, T. A.
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p. 2079 - 2083
(2007/10/02)
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