Author Type

Graduate Student

Date of Award

1971

Document Type

Thesis

Publication Status

Version of Record

Submission Date

October 2026

Abstract

The reduction of Mo2O4 (cysteine)2^2-, a model complex for molybdenum redox enzymes, was studied using pr e parative and electrochemical techniques. Molybdenum(IV) complexes prepared were Mo2O3(cysteine)^4- and Mo2O3 (cysteine)2^2-. Electrochemical reduction of Mo2O4 (cysteine)2^2- produced the monomeric molybdenum(IV)-cysteine complex. The electrode reaction mechanism was found to be an ECE process and involved two one-electron reduction steps. The intermediate in this process was a Mo(V)/Mo(IV) mixed valence dimer, and its rate of dissociation into Mo(V) and Mo(IV) monomers was 50 sec^-1 at pH 9.2 and 22°C. Mo2O4 (cysteine)2^2- was observed to react with free cysteine at pH 8-10. This reaction was first order in Mo2O4 (cysteine)2^2- and first order in cysteine; the rate constant in pH 9.2 borate buffer was 10.9 ± 1.8 x 10^-3 M^-1 sec^-1 at 22°C. Cysteine was catalytically regenerated in this reaction. The reaction was formulated as a cysteine-catalyzed autooxidation-reduction of Mo2O4 (cysteine)2^2- yielding a molybdenum(IV)-cystine dimer as the product.

Extent

71 p.

Comments

FAU Electronic Theses and Dissertations Collection|Thesis (M.S.)--Florida Atlantic University, 1971.|Charles E. Schmidt College of Science|FAU Electronic Theses and Dissertations Collection

Identifier

FADT13459

Format

pdf

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