- Mercury(II) cyanide complexes of thioureas and the crystal structure of [(N-methylthiourea)2 Hg(CN)2]
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Mercury(II) cyanide complexes of thioureas (Tu), N-methylthiourea (MeTu), and N,N′-dimethylthiourea (DmTu)) have been prepared and characterized by IR and NMR (1H and 13C) spectroscopy, and the crystal structure of one of them was determined by X-ray crystallography. An upfield shift in 13C NMR and downfield shifts in 1H NMR are consistent with the sulfur coordination to mercury(II). The appearance of a band around 2200 cm-1 in IR and a resonance around 145 ppm in 13C NMR indicates the binding of cyanide to mercury(II). The NMR data show that the [(Thione)2Hg(CN)2] complexes are stable in solution and undergo no redistribution reactions. In the crystal structure of the title complex, mercury atom is coordinated to two thione sulfur atoms of MeTu and to two cyanide carbon atoms in a distorted tetrahedral mode with the bond angles in the range of 90.2(2)°-169.3(3)°.
- Isab,Fettouhi,Malik,Ali,Fazal,Ahmad
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- ELECTROCHEMICAL STUDY OF CIS-DICYANOAQUOETHYLENEDIAMINE NITROSYLCHROMIUM COMPLEX AND ITS ADDUCTS WITH MERCURY(II) AND SILVER(I)
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The paper describes electrochemical properties of NO(en)(H2O)Cr(CN)2 and the polarographic investigation of its acid hydrolysis.Stoichiometry (1:1) of NO(en)(H2O)Cr(CN)2 reactions with Hg(2+) and Ag(1+) was determined using potentiometric method.Adducts formed by these reactions were investigated polarographically and linkage isomerisation of bridging cyano ligands has been found to be involved in their formation.Decomposition kinetics of the adduct NO(en)(H2O)Cr(NC)2Hg(2+) was studied, factors affecting it discussed and found kinetics data compared with those determined for similar cyano complexes.
- Rievaj, Miroslav,Korgova, Elena,Bustin, Dusan
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p. 671 - 676
(2007/10/02)
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- Etude du comportement electrochimique des ions cyanure dans la dimethylsulfone fondue a differentes electrodes
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A systematic study about the electrochemical behaviour of the cyanide ions in molten dimethylsulfone medium at 127 degC using several electrodes has been carried out.The oxydation of cyanide ions on a platinum electrode in this medium leads to cyanogen which is a electrochemically inactive species in molten dimethylsulfone.The anodic oxydation at a silver electrode in the presence of cyanide ions give two waves.The first one is due to the formation of Ag(CN)2(1-) complex, and the second one is due to the formation of a solid product, Ag(CN).These electrochemical reactions are useful to determine the cyanide ions by a stripping chatodic method in the concentration level of 0.05 ppm.The anodic oxydation of gold amalgamated electrode in the presence of cyanide ions give several waves not well defined and finally the Hg(CN)2 complex.
- Garces, J. L. Pison,Andreu, R. Gallego,Batanero, P. Sanchez
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