Xi:Irritant;
7681-65-4Relevant articles and documents
Nano-particulate CuI film formed on porous copper substrate by iodination
Yang, Yang,Li, Xuefei,Zhao, Bin,Chen, Huilan,Bao, Ximao
, p. 400 - 404 (2004)
A nano-particulate thin CuI film is fabricated by iodination of a porous copper substrate that was prepared by using an alumina mask and characteristic properties of these films are studied.
Chemistry of heterocyclic 2-thiones: In situ generation of 3-(2-thiazolin-2-yl)thiazolidine-2-thione and 1,1′-dimethyl-2,2′- diimidazolyl sulfide and their coordination to CuI and Cu II
Lobana, Tarlok S.,Sultana, Razia,Butcher, Ray J.,Castineiras, Alfonso,Akitsu, Takashiro,Fernandez, Francisco J.,Vega, M. Cristina
, p. 5161 - 5170 (2013)
The chemical reactivity of copper(I) chloride/copper(I) bromide, [Cu I(NCCH3)4](BF4), and copper(II) nitrate towards a series of heterocyclic-2-thiones under aerobic conditions is described. Thiazolidine-2-thione (NC3H5S2) in CH3CN in the presence of copper(I) chloride/bromide and [Cu I(NCCH3)4](BF4) was transformed into 3-(2-thiazolin-2-yl)thiazolidine-2-thione (C3H4S 2N-C3H4SN) through C-S bond cleavage and the formation of a C-N bond between two heterocyclic rings. This new thio ligand (C3H4S2N-C3H4SN) chelates to CuI through N,S-donor atoms, and the third site is occupied by the halogen atoms (Cl, Br), which leads to the formation of three-coordinate CuI complexes, [CuIX(κ2-N,S-C 3H4S2N-C3H4SN)] [X = Cl (1), Br (2)], and a four-coordinate N,S-chelated complex, [Cu I(κ2-N,S-C3H4S 2N-C3H4SN)2](BF4) (3), is obtained in the presence of BF4-. In each case, the formation of CuSO4·5H2O was also observed. Upon reaction of 1-methylimidazoline-2-thione (N2C4H 6S) with [CuI(NCCH3)4](BF 4) or copper(II) nitrate in CH3CN or CH 3CN/MeOH, respectively, the thio ligand is converted into 1,1′-dimethyl-2,2′-diimidazolyl sulfide (N2C 4H5)2S (a thioether), which prefers to bind to CuII (in situ formed) to yield six-coordinate N,N-chelated octahedral complexes, namely, {CuII[κ2-N,N-(N 2C4H5)2S]2(κ 1-OH2)2}X2 [X = BF4 (6), NO3 (7)], with water in the axial positions. The transformation of the thio ligand into 1,1′-dimethyl-2,2′-diimidazolyl sulfide is also observed in its copper(I) chloride reaction in acetonitrile, which yields an N,N-chelated chloro-bridged dimer, {CuII2[κ 2-N,N-(N2C4H5)2S] 2(μ-Cl)2Cl2} (5). Reaction of copper(I) iodide with thiazolidine-2-thione and 1-methylimidazolidine-2-thione (N 2C4H8S) in acetonitrile yields an iodo-bridged dimer, [Cu2(κ1-S-NC3H5S 2)4(μ-I)2] (4), and a novel polymer, [Cu4(μ3-I)2(μ-I)2(μ-S- N2C4H8S)2(κ1-S- N2C4H8S)]n (8), respectively. Reactions of copper(I) halides (Cl, Br), [CuI(NCCH3) 4](BF4), and copper(II) nitrate with thiazolidine-2- thione, 1-methylimidazoline-2-thione, and imidazolidine-2-thione in different solvents result in C-S bond cleavage and the in situ production of sulfate. For example, thiazolidine-2-thione is transformed into a new thio ligand, 3-(2-thiazolin-2-yl)thiazolidine-2-thione, which forms compounds 1 and 2 depending on the anion. Copyright
Highly Selective Fluorescent Probe Based on 2-(2′-Dansylamidophenyl)-Thiazole for Sequential Sensing of Copper(II) and Iodide Ions
Kim, Bo-Yeon,Pandith, Anup,Cho, Chan Sik,Kim, Hong-Seok
, p. 163 - 168 (2019)
A novel highly selective fluorescent probe based on 2-(2′-dansylamidophenyl)-4-phenylthiazole (1) is developed for sequential sensing of copper(II) and iodide ions in acetonitrile. The fluorescence mechanism is based on cation-induced inhibition of excited-state intramolecular hydrogen transfer, intramolecular charge transfer, and metal–ligand electron/charge transfer. Subsequent iodide-induced extrusion of copper(II) results in partial revival of fluorescence. Probe 1 and its ensemble with copper (II) show high selectivity for copper(II) and iodide ions, respectively, in acetonitrile solution.
Synthesis of nano-CuI and its catalytic activity in the thermal decomposition of ammonium perchlorate
Liu, Yaqing,Cheng, Yun,Lv, Shiqi,Liu, Chunsheng,Lai, Junling,Luo, Genxiang
, p. 3885 - 3892 (2015)
Nano-CuI was fabricated by an element-direct-reaction route at 40°C in acetonitrile, and used as a catalyst in the thermal decomposition of ammonium perchlorate. The effects of polyvinyl pirrolidone (PVP) as an additive in the preparation of the catalyst and the addition amount of the catalyst in thermal decomposition reaction on the catalytic activity were investigated. Meanwhile, the morphologies and composition of the catalyst were also identified by X-ray diffraction, scanning electron microscopy, transmission electron microscopy, and energy dispersive X-ray spectroscopy. The results showed that nano-CuI can remarkably decrease the higher decomposition temperature of ammonium perchlorate by more than 100°C, and that the temperature can be further reduced by using the nano-CuI catalyst with PVP as an additive in preparation. In addition, smaller crystallite size and increasing addition amount of nano-CuI in the thermal decomposition are favorable for improving its catalytic activity.
Cu4Mo6Se8: Synthesis, crystal structure, and electronic structure of a new Chevrel phase structure type
McGuire, Michael A.,Ranjan, Chinmoy,DiSalvo, Francis J.
, p. 2718 - 2726 (2006)
Cu4Mo6Se8 has been synthesized by intercalation of Cu into Cu2Mo6Se8 at room temperature, and its crystal structure has been determined. This compound crystallizes in the triclinic space gr
2D compound formation during copper dissolution: An electrochemical STM study
Broekmann,Hai,Wandelt
, p. 3971 - 3977 (2006)
The reversible formation of a 2D-CuI film on Cu(1 0 0) is studied by means of cyclic voltammetry in combination with electrochemical scanning tunneling microscopy. Exposing the Cu(1 0 0) electrode surface to an acidic and iodide containing electrolyte (5 mM H2SO4/1 mM KI) leads to the formation of a well ordered c(p × 2)-I adsorbate layer at potentials close to the onset of the anodic copper dissolution reaction. Copper dissolution starts at slightly more positive potentials preferentially at step edges in the presence of the iodide adlayer via the removal of copper material from kink sites at step edges. This increase of mobile Cu+ ions causes the local exceeding of the CuI solubility product (pKL = 11.3), thereby giving rise to the nucleation and growth of a laterally well ordered 2D-CuI film. Key structural motifs of the growing CuI film are closely related to the (1 1 1) plane of bulk CuI. Quite intriguing, the 2D-CuI film does not act as a passive layer. Copper dissolution proceeds even in the presence of this binary compound via an inverse step flow mechanism.
Characterization of defect thiospinels Cu1-x[Ti2 ]S4 (0
James,Goodenough,Clayden,Banks
, p. 143 - 155 (1989)
The thiospinel framework [Ti2]S4 represents a metastable host selective to Li insertion/extraction reactions in three dimensions that is of technical interest as a battery-cathode material. Synthesis is performed by oxidative extraction of copper from Cu[Ti2]S4, but complete extraction of copper from a stoichiometric starting material has not been possible. The authors report structural, transport, magnetic, 65Cu NMR, and electrochemical data for the defect-thiospinel systems Cu1-x[Ti2]S4, 0 2 at 45°C. X-ray data show a linear decrease in lattice parameter with increasing x up to 2.4% (7.2% by volume) at Cu0.07[Ti2]S4. Neutron diffraction shows that the residual copper atoms of the x = 0.92 sample remain in the tetrahedral 8a sites of the spinel framework. Electrochemical lithiation of Cu[Ti2]S4 and Cu0.07[Ti2]S4 gave an open-circuit voltage versus lithium that is higher in the former than it is in the latter. These several properties, including the limiting composition x = 0.93, are accounted for by constructing semi-empirical band diagrams for Cu[Ti2]S4 and Cu0.07[Ti2]S4.
James,Goodenough,Clayden,Banks
, p. 143 - 155 (1989)
The thiospinel framework [Ti2]S4 represents a metastable host selective to Li insertion/extraction reactions in three dimensions that is of technical interest as a battery-cathode material. Synthesis is performed by oxidative extraction of copper from Cu[Ti2]S4, but complete extraction of copper from a stoichiometric starting material has not been possible. The authors report structural, transport, magnetic, 65Cu NMR, and electrochemical data for the defect-thiospinel systems Cu1-x[Ti2]S4, 0 2 at 45°C. X-ray data show a linear decrease in lattice parameter with increasing x up to 2.4% (7.2% by volume) at Cu0.07[Ti2]S4. Neutron diffraction shows that the residual copper atoms of the x = 0.92 sample remain in the tetrahedral 8a sites of the spinel framework. Electrochemical lithiation of Cu[Ti2]S4 and Cu0.07[Ti2]S4 gave an open-circuit voltage versus lithium that is higher in the former than it is in the latter. These several properties, including the limiting composition x = 0.93, are accounted for by constructing semi-empirical band diagrams for Cu[Ti2]S4 and Cu0.07[Ti2]S4.
Synthesis, morphology, and optical properties of cui microcrystals
Shevchenko,Piskunovich,Zhuravkov,Bokshits
, p. 630 - 634 (2012)
We have studied the effect of synthesis conditions on the luminescence spectra of ultrafine CuI powders. The results demonstrate that synthesis conditions (the reductant of Cu2+, the anion of the copper(II) salt, initial solution concentrations, and the presence of a stabilizer) influence the size and shape of the forming CuI particles and, accordingly, their luminescence spectrum. The highest luminescence intensity near λmax ?720 nm (λex ?370 nm) is offered by regularly shaped tetrahedral particles 1.1-1.2 μm in average size. Pleiades Publishing, Ltd., 2012.
Effects of doping on transport properties in Cu-Bi-Se-based thermoelectric materials
Hwang, Jae-Yeol,Mun, Hyeon A.,Kim, Sang Il,Lee, Ki Moon,Kim, Jungeun,Lee, Kyu Hyoung,Kim, Sung Wng
, p. 12732 - 12738 (2014)
The thermoelectric properties of Zn-, In-, and I-doped Cu1.7Bi4.7Se8 pavonite homologues were investigated in the temperature range from 300 to 560 K. On the basis of the comprehensive structural analysis using Rietveld refinement of synchrotron radiation diffraction for Cux+yBi5-ySe8 compounds with the inherently disordered crystallographic sites, we demonstrate a doping strategy that provides a simultaneous control for enhanced electronic transport properties by the optimization of carrier concentration and exceptionally low lattice thermal conductivity by the formation of point defects. Substituted Zn or In ions on Cu site was found to be an effective phonon scattering center as well as an electron donor, while doping on Bi site showed a moderate effect for phonon scattering. In addition, we achieved largely enhanced power factor in small amount of In doping on Cu site by increased electrical conductivity and moderately decreased Seebeck coefficient. Coupled with a low lattice thermal conductivity originated from intensified point defect phonon scattering by substituted In ions with host Cu ions, a thermoelectric figure of merit ZT of 0.24 at 560 K for Cu1.6915In0.0085Bi4.7Se8 was achieved, yielding 30% enhancement compared with that of a pristine Cu1.7Bi4.7Se8 at the same temperature.
Dimorphism of a new Cul coordination polymer: Synthesis, crystal structures and properties of catena[Cul(2-iodopyrazine-N)] and poly[Cul(μ2-2-iodopyrazine-N,N′)]
Naether, Christian,Wriedt, Mario,Jess, Inke
, p. 2391 - 2397 (2003)
Two modifications of the new copper(I) iodide coordination polymer Cul(2-iodopyrazine) were obtained by the reaction of Cul and 2-iodopyrazine in acetonitrile. During this reaction, intensely yellow crystals of form I appear first which transform within several minutes to intensely red crystals of form II which is the thermodynamically most stable form at room temperature. In catena[Cul(2-iodopyrazine-N)] (form I; a = 4.1830 (6) A; b = -10.814 (1) A; c = 17.961 (4) A; V = 812.5 (2) A3; orthorhombic; P212121; Z = 4), corrugated Cul double chains are found in which each copper atom is coordinated by one additional 2-iodopyrazine ligand. In poly[Cul(μ-2-iodopyrazine-N, N′)] (form II; a = 4.2679 (5) A; b = 13.942 (2) A, c = 13.017 (2) A, b = 92.64 (1)°; V = 773.76 (2) A3; monoclinic; P21/c; Z = 4), Cul single chains occur which are connected via μ-N,N′ coordination by the 2-iodopyrazine ligands to layers parallel to (010). The thermal behavior of both forms was investigated using simultaneous differential thermoanalysis, thermogravimetry, and mass spectrometry as well as differential scanning calorimetry and temperature resolved X-ray powder diffraction. On heating, both forms decompose to copper(I) iodide, and the decomposition temperature of form I is significantly lower than that of form II. From all experiments, there is no indication of a phase transition of one form into the other or for the formation of a phase with lower amine content.
