Ultraviolet-visible spectrum, and kinetics of formation and decomposition, of penta-aquahydridochromium(III) and chromium(I) in aqueous perchlorate solutions: A pulse-radiolysis study

Haim Cohen, Dan Meyerstein

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28 Scopus citations

Abstract

The reaction of hydrogen atoms with Cr2+(aq) has been studied and a specific rate constant of 1.5 × 109 l mol-1 s-1 determined. The product of this reaction in acid solution is [Cr(H2O)5H]2+. The absorption spectrum of this complex has been measured and found to be similar to that of complexes containing chromium-carbon bonds. The mechanism of decomposition of [Cr(H2O)5H]2+ obeys the rate equation Kobs = k17 + k18[H3O+], where k17 ≤ 1 s-1 and k18 = 1.8 × 104 l mol-1 s-1 at 22 ± 2 °C. In neutral solutions Cr+(aq) is formed by reaction of e-(aq) with Cr2+(aq). The absorption spectrum of Cr+(aq) and the kinetics of its decomposition are reported and discussed. The implication of these results to the mechanism of dissolution of chromium metal and on the photochemistry of Cr2+(aq) are examined.

Original languageEnglish
Pages (from-to)2559-2564
Number of pages6
JournalJournal of the Chemical Society. Dalton Transactions
Issue number23
DOIs
StatePublished - 1 Dec 1974
Externally publishedYes

ASJC Scopus subject areas

  • General Chemistry

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