ChemInform Abstract: MECHANISM OF THE REDUCTION OF LEAD IONS IN AQUEOUS SOLUTION (A PULSE RADIOLYSIS STUDY)

Breitenkamp, M.; Henglein, A.; Lilie, J.

doi:10.1002/chin.197703030

Cited by 3 publications

(4 citation statements)

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“…The rate of polymerization for ZnO increases in the order acetonitrile < methanol < ethanol < isopropyl alcohol, which agrees with the redox potentials of the alcohol radicals. 40 No polymerization was observed in acetonitrile as expected, since it is not an efficient hole scavenger. The separation of the electron and the hole pair formed upon illumination is necessary for polymerization to occur.…”

Section: Resultssupporting

confidence: 53%

Q-sized cadmium sulfide: synthesis, characterization, and efficiency of photoinitiation of polymerization of several vinylic monomers

Hoffman¹,

Mills²,

Yee³

et al. 1992

J. Phys. Chem.

309

179

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Section: Resultssupporting

confidence: 53%

Q-sized cadmium sulfide: synthesis, characterization, and efficiency of photoinitiation of polymerization of several vinylic monomers

Hoffman¹,

Mills²,

Yee³

et al. 1992

J. Phys. Chem.

309

179

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“…The additional 2.7 silver atoms per 100 eV must have been formed under the influence of the 1-hydroxy-isopropyl radical, the main radical produced in the attack of OH in isopropanol. However, the standard redox potential of this radical [21] is not negative enough to reduce a silver ion in a simple electron transfer: (CH3)2COH + Ag' + (CH3),C0 + H + + Ago(aq). We must therefore conclude that it acts as a reductant towards either Agz or more agglomerated silver species, whose formation is initiated by the silver atom produced in the attack of ea; and H on Agt :…”

Section: (11)mentioning

confidence: 99%

“…[20] In the case of 2,3-and 2,6-DMP it was not possible to determine the rate constmts for decay of the phenoxyl radicals due to simultaneous formation of products which absorb in the same wavelength region as the phenoxyls. [21] R. Livingston and H. Zeldes, J . Amer.…”

mentioning

confidence: 99%

The Reactivity of Silver Atoms in Aqueous Solutions (A γ‐Radiolysis Study)

Henglein¹

1977

Ber Bunsenges Phys Chem

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155

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Silver chloride and silver are the products of the γ‐irradiation of air‐free Ag+ solutions (∼ 10−3 M) containing chloroacetic acid (∼ 10−3 M), hydrogen ions (1 M) and t‐butanol (∼ 10−1 M). The products result from various reactions of the silver atoms formed in the attack of H atoms on Ag+ ions. The free silver atom Ago(aq), Ag+2, and agglomerated atoms Agm+n (m < n) are intermediates of silver formation whose redox potential increases with increasing agglomeration number n. Ago(aq) and probably Ag+2 transfer an electron to chloroform, and Ago(aq) with less efficiency to chloroacetic acid and ethyl chloride. They also are able to reduce Cu2+ ions. The Cu+ ions initiate the reduction of Ag+ to yield the metal without Ago(aq) being an intermediate.—The formation of silver in γ‐irradiated 10−3 M Ag+ solutions containing alcohols was also studied. In the presence of t‐butanol, G(Agmetal) amounts to 1.8. In the presence of i‐propanol, it is equal to 4.7. In a solution containing both acetone and i‐propanol, the formation of silver is slow and autocatalyzed. 1‐hydroxy‐alkyl radicals cannot reduce Ag+ in a single electron transfer process. However, reduction of Agm+n agglomerates (which have a more positive redox potential) is possible.

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“…is close to -1.8 V. 4 Electron transfer from the first reduction products of thallium to Cd2+ would have little driving force; however, as in the thallium-silver system, mixed-cluster formation could be expected. The standard potential of the system Pb+ -* Pb2+ + e_ (5) is -1.0 V.5 Electron transfer from reduced thallium to lead should be strongly exoergic. The standard potential of the redox system Zn+ -* Zn2+ + eaq_ (6) is as negative as -2.5 V. 4 In this case, electron transfer from Zn+ to Tl+ seemed probable.…”

Section: Introductionmentioning

confidence: 99%

Mixed-Metal Clusters in Aqueous Solution: Reactions of Tl2+ with Ag+, Cd2+, and Pb2+ and of Zn+ with Tl+

Ершов¹,

Janata²,

Henglein³

1994

J. Phys. Chem.

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Tlz+ is generated pulse radiolytically in 2 x M T1+ solutions containing small concentrations of Ag+, Cdz+, and Pb2+ ions. The reaction of Tlz' with Ag+ occurs with k = 3 x IO9 M-' s-', the first product being a mixed cluster to which the structure (TlAg)+ is attributed. It has strong absorption bands at 375 and 270 nm. The cluster rapidly reacts in a complex process with a second Ag+ ion (k = 5 x lo9 M-' s-'). T12+ reacts with Cdz+ with k = 9 x IO7 M-' s-l to yield a product that absorbs below 250 nm. The reaction is shown to be not a simple electron transfer; formation of a cluster, possibly (CdT1)2+, is proposed. Reaction of T l 2 + with Pbz+ consists of the transfer of an electron, k = 2 x IO9 M-' s-l. Zn+ transfers an electron to T1+ with k = 5 x IO9 M-' s-'. These reactions are discussed in terms of the electrochemical potentials of the abnormal valence states of the metal ions involved.

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ChemInform Abstract: MECHANISM OF THE REDUCTION OF LEAD IONS IN AQUEOUS SOLUTION (A PULSE RADIOLYSIS STUDY)

Abstract: Bei "Co‐′y‐Bestrahlung wäßriger Pb(ClO4),‐ oder Pb(OAc),‐Lösungen fällt in Gegenwart von OH‐Radikalfängern wie Formiat, aliphatische Alkohole, Cyclopentan oder tert.‐Butanol reines Pb aus.

Cited by 3 publications

References 1 publication

Q-sized cadmium sulfide: synthesis, characterization, and efficiency of photoinitiation of polymerization of several vinylic monomers

Q-sized cadmium sulfide: synthesis, characterization, and efficiency of photoinitiation of polymerization of several vinylic monomers

The Reactivity of Silver Atoms in Aqueous Solutions (A γ‐Radiolysis Study)

Mixed-Metal Clusters in Aqueous Solution: Reactions of Tl2+ with Ag+, Cd2+, and Pb2+ and of Zn+ with Tl+

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