Solution behavior of Hg(II)-cystamine by Uv-Vis and ¹⁹⁹Hg NMR

Article type: Research Article

Authors: Bharara, Mohan S. | Parkin, Sean | Atwood, David A.

Affiliations: Department of Chemistry, University of Kentucky, Lexington, Kentucky 40506-006

Note: [] Corresponding author. E-mail: datwood@uky.edu

Abstract: The combination of HgCl2 with the disulfide salt of 2-aminoethanethiol (cystamine dihydrogen dichloride) in water yields a two-dimensional chain {[HgCl4][(NH3CH2CH2S–)2]}n (1). It consists of six-coordinate Hg in [HgCl4]n units with bridging and termainal Cl atoms. The disulfide groups, (NH3CH2CH2S–)2 are held between the [HgCl4]n chain with weak S–S interactions. The chlorides in the [HgCl4]n units are involved in intermolecular hydrogen bonding to yield a three-dimensional network. A similar reaction with the reduced form of cystamine (2-amino ethanethiol) yields a linear Hg(II)-bis-thiolate, [Hg(SCH2CH2NH3]2+ (2). When compound 1 is combined with two equivalents of NaOH it rearranges to 2 as indicated by 199Hg NMR and Uv-Vis.

Keywords: HgCl2, Cystamine, Disulfide, 199Hg NMR, Uv-Vis

DOI: 10.1080/10241220600595450

Journal: Main Group Chemistry, vol. 4, no. 3, pp. 217-225, 2005