Metal ion-sulfur(IV) chemistry. 2. Kinetic studies of the redox chemistry of copper(II)-sulfur(IV) complexes

Journal Article · Mon Aug 01 00:00:00 EDT 1988 · Environ. Sci. Technol.; (United States)

DOI:https://doi.org/10.1021/es00173a005· OSTI ID:6774025

Conklin, M H; Hoffmann, M R

The redox chemistry of Cu(II)-S(IV) complexes is examined, and the rate of reduction of Cu(II) is determined. The reduction of Cu(II) is shown to proceed via Cu/sup II//sub 2/SO/sub 3//sup 2 +/ and Cu/sup II//sub 2/CO/sub 3/OH/sup +/ intermediates. Copper(I), SO/sub 4//sup 2 -/, and a mixed-valence compound, Cu/sup II/SO/sub 3/Cu/sub 2//sup I/SO/sub 3/ x 2H/sub 2/O, are determined to be the principal products. The rate law is consistent with consecutive first-order reactions. Results are interpreted in terms of the initial formation of an inner-sphere complex, which is followed by a rate-limiting electron-transfer step. These results are discussed in light of previously accepted mechanisms for the trace metal catalysis of the autoxidation of SO/sub 3//sup 2 -/.

• Research Organization: California Institute of Technology, Pasadena (USA)
• OSTI ID: 6774025
• Journal Information: Environ. Sci. Technol.; (United States), Vol. 22:8
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
COPPER
REDOX REACTIONS
SULFUR
COMPLEXES
ELECTRON TRANSFER
CHEMICAL REACTIONS
ELEMENTS
METALS
NONMETALS
TRANSITION ELEMENTS
400201* - Chemical & Physicochemical Properties