Journal ArticleDOI
Two thiourea-containing gold(I) complexes.
Oscar E. Piro,Eduardo E. Castellano,R. C. V. Piatti,Agustín Eduardo Bolzán,Alejandro Jorge Arvia +4 more
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TLDR
The crystal structures of two salts of bis(thiourea)gold(I) complexes are determined, relevant in interpreting different electrochemical processes where gold-thiOUrea species are formed.Abstract:
The crystal structures of two salts of bis(thiourea)gold(I) complexes, namely bis(thiourea-κS)gold(I) chloride, [Au(CH4N2S)2]Cl, (I), and bis[bis(thiourea-κS)gold(I)] sulfate, [Au(CH4N2S)2]2SO4, (II), have been determined. The chloride salt, (I), is isomorphous with the corresponding bromide salt, although there are differences in the bonding. The AuI ion is located on an inversion centre and coordinated by two symmetry-related thiourea ligands through the lone pairs on their S atoms [Au—S 2.278 (2) A and Au—S—C 105.3 (2)°]. The sulfate salt, (II), crystallizes with four independent [Au(CH4N2S)2]+ cations per asymmetric unit, all with nearly linear S—Au—S bonding. The cations in (II) have similar conformations to that found for (I). The Au—S distances range from 2.276 (3) to 2.287 (3) A and the Au—S—C angles from 173.5 (1) to 177.7 (1)°. These data are relevant in interpreting different electrochemical processes where gold–thiourea species are formed.read more
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The gold–hydrogen bond, Au–H, and the hydrogen bond to gold, Au⋯H–X
TL;DR: From the available data, it appears that all the intra- and intermolecular Au∙�’∙H-X contacts are associated with very low binding energies and non-specific directionality.
Journal ArticleDOI
Stable gold(III) complexes with thiosemicarbazone derivatives.
TL;DR: The [AuCl(L)]+ cations represent the first gold(III) complexes with thiourea derivatives which are not stabilised by an additional organometallic ligand.
Journal ArticleDOI
Thiocarbamoyl chitosan: Synthesis, characterization and sorption of Au(III), Pt(IV), and Pd(II)
TL;DR: In this article, a new method of chitosan sulfur derivatives (thiocarbamoylchitosans) synthesis via reaction in eutectic two-component system ammonium rodanide-thiourea that allows significant increase of substitution degrees at the reduced time and reagent consumption as compared to conventional synthetic procedures.
Journal ArticleDOI
Effect of thiourea on sulphuric acid leaching of bastnaesite
TL;DR: In this paper, the possibility of leaching bastnaesite pre-concentrate in dilute sulphuric acid solutions at 25 °C was studied, and it was shown that the addition of thiourea to the leaching medium further increased the dissolution of the rare-earth elements in the unroasted and especially in the roasted preconcentrates due to the reduction of cerium (IV) to cerium(III), thus increasing the cerium dissolution value from 22.8% to 93.0%.
References
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A semi-empirical method of absorption correction
TL;DR: An extension of Furnas's method is described in this paper, where the variation of intensity of an axial reflection as the crystal is rotated about the goniometer axis is used to give a curve of relative transmission T against azimuthal angle ϕ for the corresponding reciprocal lattice level.
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Calculation of absorption corrections for camera and diffractometer data
Journal ArticleDOI
A neutron diffraction determination of the crystal structures of thiourea and deuterated thiourea above and below the ferroelectric transition
M. M. Elcombe,J. C. Taylor +1 more
TL;DR: In this paper, the structures of thiourea, SC(NH2)2 and deuterated SC(ND 2)2 have been determined at room and liquid nitrogen temperatures from three-dimensional neutron diffraction data.