- Dismutation of Hg22+ catalyzed by colloidal gold
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Colloidal gold in acetonitrile catalyzes the disproportionation of Hg 22+ to Hg2+ and Hg0. This catalysis is apparently initiated by the amalgamation of the gold particles, which is indicated by a concomitant change of the plasmon absorption of colloidal gold. Colloidal gold in acetonitrile catalyzes the disproportionation of Hg 22+ to Hg2+ and Hg0. This catalysis is apparently initiated by the amalgamation of the gold particles which is indicated by a concomitant change of the plasmon absorption of colloidal gold.
- Kunkely, Horst,Vogler, Arnd
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- Reactivity of palladium dithizonate with Lewis acids and bases
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Palladium cannot be removed from palladium dithizonate (Pd(Dz)2) by thiocyanate, cyanide (pH 8), or ethylenediaminetetraacetate (pH 3-8) or by copper perchlorate, silver perchlorate, mercury(II) chloride, or mercury(II) perchlorate in acidic solutions. Palladium dithizonate does react with mercury perchlorate in perchloric acid as well as silver perchlorate at pH 2-4. The products of the reaction with mercury perchlorate studied in four organic solvent systems were examined. The equilibrium constants (-log K) of the postulated reaction 2Pd(Dz)2(o) + Hg2+ + 2ClO4- ? 2Pd(ClO4)Dz(o) + Hg(Dz)2(o) were estimated as 2.79 + 0.19 (CHCl3), 1.35 ± 0.07 (CCl4), 2.56 ± 0.20 (C6H6), and 1.92 ± 0.10 (C6H5Cl). From these, a comparison of the stability of the two palladium dithizonates was made and the cause of the reaction was discussed. The reaction with silver is not a metal exchange but is different from that with mercury, and a mixed-metal secondary dithizonate may be involved.
- Ma, Enxin,Freiser, Henry
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p. 3342 - 3344
(2008/10/08)
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