Portland State University. Department of Chemistry
David K. Roe
Date of Award
Master of Science (M.S.) in Chemistry
1 online resource (68 p.)
The study of the reaction of cadmium and sulfur in dimethylsulfoxide (DMSO) is presented. Specifically, the reaction of dissolved molecular sulfur in DMSO at temperatures greater than 90°C with freshly precipitated metallic cadmium is followed by UV-visible spectrometry, atomic absorption spectrometry, and Raman spectrometry. Evidence for the formation of a new cadmium-sulfur species and S3- is discussed. In a second reaction, an equilibrium sodium polysulfide solution in DMSO is titrated with a solution of cadmium ion at room temperature and the reaction progress is followed by means of UV-visible spectrometry. A calculation of the average number of polysulfide charges reacting with each cadmium ion, n̄Q, was made using literature values of the molar absorptivities of the ions S3-, S8- 2, and S6- 2 and Beer's law. Likewise, the average number of sulfur atoms, n̄M, reacting with each cadmium ion was determined. A value of 4.8 polysulfide charges per cadmium ion was determined for n̄Q and a value of 18 sulfur atoms per cadmium ion was determined for n̄M. The significance of the possible formation of cadmium polysulfide complexes is discussed briefly in conjunction with the reaction mechanisms involved in the electrodeposition of CdS from a DMSO solution of CdCl2 and S8.
Hogle, Howard W., "An investigation of cadmium and sulfur reactions in dimethylsulfoxide" (1982). Dissertations and Theses. Paper 3213.