A Nephelometric Analysis of Mercury(II) with Potassium Salt of α,α′-Bis(dithiocarboxyoxy)-p-xylene

Abstract

Potassium salt of α,α′-bis(dithiocarboxyoxy)-p-xylene (abbreviated as K2-XDX) was synthesized as a chelating agent with p-xylene-α,α′-diol, carbon disulfide, and potassium hydroxide. Since a mercury(II)–XDX chelate complex suspension scattered pearl-blue light strongly because of the formation of a colloidal solution, the nephelometric analysis of small amounts of mercury(II) was undertaken. The calibration curve was found to be linear in the two ranges of 0.03–1.00 and 0.50–25.00 μg cm−3 of the mercury(II) ion respectively, but no suitable masking agents for interfering metal ions were found. The mole ratio of mercury(II) to XDX in the complex was found to be 1 to 1. These data for the complex suggested that XDX and mercury(II) combined alternately to form the (–Hg–XDX–)n complex. The molecular weight of this complex could be calculated as about 2×107 from the Zimm plot on the basis of the light-scattering method.

Bimetallic complexes based on carboxylate and xanthate ligands: Synthesis and electrochemical investigations

“…The CVs of [{Ru(CH=CHC 6 H 4 Me-4)(CO) (10) were also compared (see ESI †). In a similar way to the comparison of the CV of complexes 6 and 12 discussed above, E • of the Ru(II/III) couple was identical for complexes 2 and 10, despite the latter having the shorter, more conjugated carboxylate-xanthate linker.…”

“…All experiments were carried out under aerobic conditions and the majority of the complexes appear indefinitely stable towards the atmosphere in solution or in the solid state. The following compounds have been described elsewhere: [RuHCl(CO)(PPh 3 ) 3 ], 32 [OsHCl (BTD) 10 Solvents and compounds not mentioned above were used as received from commercial sources. MALDI-MS and FAB-MS data were obtained using Micromass TofSpec and Autospec Q instruments, respectively.…”

“…One example is the ligand KS 2 COCH 2 C 6 H 4 CH 2 OCS 2 K, for which only one report exists aimed at its use in the analysis of mercury(II). 10 Although this and other metals were complexed using this ligand to form polymers, none of the metal species was characterised. Moreover, only one paper reports the preparation of (mononuclear) ruthenium vinyl complexes bearing a xanthate ligand, 9c and no previous examples exist for osmium vinyl species.…”