II), Bi Research Articles

Properties and Infrared Spectra of Ethylenediaminetetraacetic Acid Complexes. V. Bonding and Structure of Several Metal Chelates in Solution

The ethylenediaminetetraacetic acid complexes of the alkaline earth ions, Co(II), Ni(II), Cu(II), Zn(II), Cd(II), Mn(II), Pb(II), Bi(III), Ce(III), Al(III), Fe(III), Cr(III), Th(IV), and V(IV) in aqueous solution were studied by infrared spectroscopy using deuterium oxide as the solvent. The effect of solution acidity upon the spectra was determined and from this stability constants were estimated for several of the chelate systems. The shift in peak position and area for the carboxylate-- carboxylic acid absorption band was used to propose structures for the complexes in solution. The data indicate that there is some tendency for metalnitrogen coordination in the alkaline earth- EDTA chelates, but that such bonding is present to a much greater extent with the complexes of the divalent transition metal ions. The structures proposed for the Fe(III), Al(III), and Cr(III) complexes are more complex and involve hydroxide groups as well as the EDTA ligand. (auth)

Separation and micro-identification of metallic ions by ring oven technique. I

Attempts to separate Hg(I), Pb(II), Ag(I), Hg(II), Bi(III), Cu(II), Cd(II), As(III), Sb(III) and Sn(II) in ternary, quaternary and quinary mixtures by the Weisz ring oven technique have been made, using oxalate as complexing agent and aqueous ethanol as solvent. It is found, in general, that addition of oxalate as complexing agent enables separations to be carried out which do not occur in the uncomplexed solutions. The effect of adding varying concentrations of the complexing agent to the solutions has been studied. The sequences of separation in ternary, quaternary and quinary mixtures with varying concentrations of the complexing agent have been described.

有機試薬としてのチアゾール誘導体に関する研究 (第4報)

Twenty-three kinds of hydrazine derivatives of thiazole were synthesized and their utility as organic reagent was examined. Characteristic coloration was found to occur by the reaction of 2, 2′-hydrazodithiazole and 2-hydrazinothiazole derivatives with Fe (III), Cu (II), Ag (I), Hg (II), Pt (IV), Au (III), and Pd (II) ions, 2, 2′-azodithiazole derivatives with Pd (II) ion alone, 2-(2-acetylhydrazino)thiazole derivatives with Co (II), Ni (II), Mn (II), Fe (III), Cu (II), Ag (I), Hg (II), Au (III), and Pd (II) ions, 2-(2, 2-diacetylhydrazino)thiazole and 2-(1, 2, 2-triacetylhydrazino)thiazole derivatives with Au (III) and Pd (II) ions, benzaldehyde 2-benzothiazolylhydrazone derivatives with Co (II), Ni (II), Cd (II), Cu (II), Ag (I), Hg (II), Au (III), and Pd (II) ions, and 1-(2-benzothiazolyl)-4-phenyl-3-thiosemicarbazide derivatives with Co (II), Cu (II), Bi (III), Au (III), Pd (II), and Pb (II). Limit of detection of these metal ions by these reagents was examined by spot test and examinations were also made on interfering ions and their removal. It was thereby found that 2-hydrazino-4-phenylthiazole was excellent spot test reagent for Cu (II) ion, 2-(2-acetylhydrazino)-4-methylthiazole for Fe (III) ion, and 2, 2′-azobis(4-methylthiazole) for Pd (II) ion.

Elektrophorese der halogenokomplexe von Hg(II), Bi(III), Cd(II), Pb(II) und -Cu(II) : Chlorokomplexe in chlorwasserstoffsäure

An apparatus for heavy-current and high-tension electrophoresis on filter paper is described This apparatus enables one to avoid the difficulties that occur in electrophoresis in base electrolytes that are highly concentrated or show greater electric conductivity The zones migrate along the paper strips with constant speed and, consequently, it is possible to measure the mobility The effective length of the filter paper strips is 660 mm Correction of the apparent mobility in the porous adsorbent is treated thoroughly. Diagrams of the electrophoretic mobility of the chloro-complexes of Hg(II), Bi(III), Cd(II), Pb(II), and Cu(II) in hydrochloric acid, are given in the experimental part The concentration of the hydrochloric acid varied between 0.1 N and 6 N In 6 N HCl all the metals investigated are present asani onic complexes. Hg, Bi.Cd, and Pb chloro-complexes show a pronounced maximum of mobility in the anionic range. The sequence of the zones in the direction anode to cathode is Hg, B1, Cd, Pb, Lu al 0.1–2.3 N HCl and B1, Hg, Cd, Pb.Cu at2.3–6 N HCl. Finally, the electrophoretic separation of a mixture of Hg, Bi, Cd, Pb, Cu in 1 N, 2 N and 4 N HCl is illustrated Complete separation of the zones was achieved in each experiment

Studies on the Analytical Application of Onium Compounds. VVI

Iodobismuthate ion and chlorobismuthate ion are formed to be determined amperometrically with triphenylselenonium chloride as precipitating reagent. As usual the precipitation reaction proceeds so slowly as to be given up titration, but according to the results of examination the 10 equivalents of iodide ion or 0.20.3N of hydrochloric acid is sufficient for making polarographically complete precipitation within 10 minutes after each portion of titrant is added. The average error of the amperometric titration is ± 1%.A solution of dodecyltrimethylammonium chloride, C12HR25(CH3)3NC1, at the concentration of 10-210-4M/l gives approximately-2. 2 volt (vs. mercury pool) of reduction potential and at that of 0. 1 M/l gives a wave similar to hydrogen wave having the maximum at around-1. 5 volt. The aqueous solution of this reagent is dissociated into [C12H25(CH3)3N]+ and Cl-; accordingly, it can be utilized for precipipitation reaction of metal ions, e. g. Hg (II), Bi (III), Cd (II), Sb (III), Sn (II), Sn (IV), Fe (III), Mn (II), Co (II), Ni (II) z.rd Zn (II), with the use of a suitable complexing agent, also, anions, e. g. Br-3, I-3, ClO-4, IO-4, VO3-4, CrO2-4, Cr2O2-7, MnO2-4, WO2-4 and MnO-4, are reacted to form the precipitate. Polarographic behaviors of dodecyltrimethylammonium chloride against metal ions, e. g. Co (II), Zn (II), Bi (III), Sb(III) and Hg (II), in the above metal ions and their amperometric titration are investigated.