N/P-ethoxyphenyl/dithiocarbamato complexes of Au(III), As(III), Fe(III), Co(III) and Mo(V)

Abstract

The complexes of Au(lll), As(Ill), Fe(lll), Co(Ill) and Mo(V) with N(p-ethoxyphenyl)-dithiocarbamate have been synthesized and characterized on the basis of elemental analyses, conductance measurements, infrared and electronic spectra, molecular weight determinations and magnetic moment data. The thermal behaviours of these complexes have been studied with the aid of TG and DTA techniques.As a continuation of our previous work on metal dithiocarbamates [1-3] the present pater describes the synthesis, characterization and thermal investigation of Au(lll), As(Ill), Fe(lll), Co(Ill) and Mo(V) complexes with N/p~thoxyphenyffdithio-carbamate. ExperimentalAmmonium N/p-ethoxyphenyl/dithiocarbamate was synthesized by the general method described in the literature [4]. Tris N/p-ethoxyphenyl/dithiocarbamato complexes of gold(lll),arsenic(lll),iron(lll) and cobalt(Ill) were prepared by mixing an aqueous solution of a salt of gold(Ill), arsenic(Ill), iron(Ill)or cobalt,(lll) with an aqueous solution of the ligand in a 1:3 metal-to-ligand ratio. The molybdenum(V) complex Mo203[S2CNH/p-OC2HsC6H4/]4 was prepared by adding an excess of sodium dithionate to an aqueous solution of Na2MoOa.2H20 (0.1 mole) and ligand (0.2 mole). The precipitated complex was filtered off, washed with distilled water and dried under vacuum over phosphorus pentoxide, yield: 68-76%.The ligand was estimated by the method of Shankaranarayana and Patel [5]. The metal, nitrogen and sulphur contents were estimated by standard gravimetric methods [6].Conductance measurements were~made in nitrobenzene at 25 + 0.1~ with a Beckmann Conductivity Bridge Model No. RC-18A. Magnetic measurements were made by Gouy's method using mercury tetrathiocyanatocobaltate/ll/as calibrant (Xg = 16.44 x 106 c.g.s, unit) at room temperature. Infrared spectra were recorded in KBr pellets in the region 4000-200 cm -I with a Perkin-Elmer 621 gratig spectrophotometer. Electronic spectra of the complexes were run on a Perkin-Elmer 4000 A instrument in the range 400-750 nm.