Studies on bismuth(III) complexes of ligands containing nitrogen/sulfur and extractive procedure for determination of Bi(III)

Abstract

The coordination behavior of thiosemicarbazide and its thiosemicarbazones towards Bi(III) is the main goal of this investigation. The structure of the isolated complexes has been proved by microanalysis, thermal, spectra (electronic, IR and ms) and voltammetric measurements. The ligands act as neutral or mononegative molecules and the coordination donors were found to be S for HTS; NN for HBTS; NS for HATS and H 2 STS and NNS or NSO for H 2 DMTS in the complexes. The complexes show thermal decomposition steps ending at 800°C with a stable fragment. The redox properties of the complexes toward oxidation waves are strongly dependent on =N thio substituents. At pH 1.5 and excess of iodide, Bi 3+ forms an orange-yellow [BiI 4 ] ) complex which associated with tricaprylylmethylammonium chloride (TCMAC) forming [TCMA] + [BiI 4 ] ) easily extracted into the CHCl 3 layer. The colored organic layer containing the ion pair is determined spectrophotometrically at 490 nm and represents the second goal.

Simultaneous voltammetric determination of trace bismuth(III) and cadmium(II) in water samples by adsorptive stripping voltammetry in the presence of cupferron

“…Bismuth compounds have been used in many different areas of life, e.g. semiconductors, cosmetic products, medicines, alloys, catalysts in the chemical industry, metallurgical additives, and in recycling of uranium nuclear fuels [2][3][4][5][6]. Both physical and chemical properties of cadmium have been implemented in a wide range of technological applications, e.g.…”

Synthesis, Characterization and Biological Activities of 4-(p-Chlorophenyl)-1-(pyridin-2-yl)thiosemicarbazide and Its Metal Complexes

“…The results were summarized in Table 5. For n = 1 lnX=ln where (4) Where α = (w o -w t )/(w o -w f ), θ = T-T s , T s is the T G peak temperature; T the temperature corresponding to the weight loss Wt; β is the heating rate (Kmin −1 ); A is the pre-exponential factor (min −1 ); R is the gas constant (8.314 Jmol −1 K −1 ) and n is the order parameter for the decomposition stage. 41 The data obtained (Table 5) indicated that:…”

“…Thiosemicarbazides and their metal complexes have the subject of interest in coordination chemistry for their variable donor properties. 1 They form stable and intense colored complexes which are used for spectrophotometric determination of metal ions in different media [2][3][4] and showed catalytic activity. 5,6 Also, they have potentially beneficial as biological properties such as antibacterial, [7][8][9][10] antifungal, 7,9,10 antitumor, 11,12 antimalarial, 13 trypanocidal 14 and anti-inflammatory activities.…”

Electrochemical determination of bismuth with use of a Bi(III)-cupferron complexation system and elimination of interferences connected with the presence of organic substances in natural samples

“…Some of its colloidal salts, due to their antiseptic, astringent and diuretic properties, have important applications in pharmaceutical preparations as anti-ulcer, antibacterial and radiotherapeutic agents [1]. Bismuth is also used in alloys and metallurgical additives and in recycling of uranium nuclear fuels [3,4]. However, a number of toxic effects on humans have been attributed to bismuth compounds, such as nephropathy, osteoarthropathy, hepatitis, and neuropathology [5].…”