Xn:Harmful;20427-59-2Relevant articles and documents
Infrared spectra and structures of the coinage metal dihydroxide molecules
Wang, Xuefeng,Andrews, Lester
, p. 9076 - 9083 (2005)
Laser-ablated Cu, Ag, and Au atoms react with H2O2 and with H2 + O2 molecules during condensation in excess argon to give four new IR absorptions in each system (O-H stretch, M-O-H bend, O-M-O stretch, and M-O-H
Bhatnagar,Goyle, Dina Nath,Prasad, Mata
, p. 79 - 82 (1928)
Doak, B. W.,Packer, J.
, (1928)
Bennett, M. C.,Wise, W. S.
, p. 696 - 702 (1956)
Mokruschin, S. G.,Konjaew, P. S.
, p. 301 - 305 (1936)
CuO nanomaterials for p-type dye-sensitized solar cells
Jiang, Tengfei,Bujoli-Doeuff, Martine,Farré, Yoann,Pellegrin, Yann,Gautron, Eric,Boujtita, Mohammed,Cario, Laurent,Jobic, Stéphane,Odobel, Fabrice
, p. 112765 - 112770 (2016)
In p-type dye-sensitized solar cells (p-DSSCs), NiO is the most commonly used p-type semiconductor. Nevertheless, because of the drawbacks of NiO, much effort has been made to search for suitable substitutes. Herein, three different morphologies of CuO nanomaterials were used to prepare photocathodes for p-DSSCs, which have a deeper valence band and a higher dielectric constant compared to that of NiO. We observe that CuO is unstable in the presence of iodide/triiodide electrolyte, while cobalt complexes with bipyridine ligands are more suitable redox shuttles. We also note that the average transport time in CuO is shorter than that in NiO. Finally, the deep absorbance of CuO in the visible range indicates that suitable sensitizers for the CuO p-DSSC must exhibit high extinction coefficient and absorption bands located in the lower energy part of the solar spectrum (>600 nm) to be exploitable. In this case such CuO based photocathodes represent valuable systems to exploit the near-infrared (NIR) region.
Nonenzymatic hydrogen peroxide biosensor based on four different morphologies of cuprous oxide nanocrystals
Zhong, Yanmei,Li, Yancai,Li, Shunxing,Feng, Shuqing,Zhang, Yayun
, p. 40638 - 40642 (2014)
In this work, we synthesized four different morphologies of cuprous oxide (Cu2O) nanocrystals (cube, rhombic dodecahedra, octahedra, and extended hexapod) by a hydrothermal method. Then, the four different morphologies of Cu2O were immobilized separately on a glassy carbon electrode (GCE) to construct a non-enzymatic hydrogen peroxide (H2O2) biosensor. We systematically explored the electrocatalytic activities of the four different Cu2O nanocrystals towards H2O2, which are strongly dependent on the shape of the Cu2O nanocrystals. It is shown that the modified electrodes exhibited excellent electrocatalysis for H2O2reduction by electrochemical experiments. Moreover, the {111}-bounded extended hexapod Cu2O, {111}-bounded octahedral Cu2O and the {110}-bounded rhombic dodecahedral Cu2O nanocrystals are significantly more active than the {100}-bounded cubic Cu2O nanocrystals, as the {111} and {110} face contain copper atoms on the surface with dangling bonds, and are expected to interact more strongly with negatively charged ions or molecules. This journal is
Sebacato-bridged Cu(II) phen complexes: Syntheses and crystal structures of 2∞[Cu2(phen)2L4/2] (H2O)6 and [(phen)2Cu(μ-L)Cu(phen)2](HL)2 (H2L)(H2O)4 (H2L = sebacic acid; phen = 1,10-phenanthroline)
Wei, Dan-Yi,Kong, Zu-Ping,Zheng, Yue-Qing
, p. 1621 - 1628 (2002)
Reactions of freshly-prepared Cu(OH)2 with sebacic acid (H2L) and 1,10-phenanthroline (phen) in EtOH/H2O (1:1 v/v) and CH3OH/H2O (1:1 v/v) and at pH 6.4 afforded two novel sebacato-bridged Cu(II) phen complexes 2∞[Cu2(phen)2L4/2] (H2O)6 (1) and [(phen)2Cu(μ-L)Cu(phen)2](HL)2 (H2L)(H2O)4 (2), respectively, Complex 1 consists of 2D 2∞[Cu2(phen)2L4/2] layers and lattice H2O molecules. The Cu atoms are each square-pyramidally coordinated by two N atoms of one phen ligand and three O atoms of different sebacato ligands. Two adjacent square pyramids are edge-shared to form [Cu2N4O4] dimers, which are interlinked by sebacato ligands to 2D 2∞[Cu2(phen)2L4/2] layers with rhombus-like 52-membered rings. The resulting layers are assembled by interlayer π-π stacking interactions and hydrogen bonding interactions. Complex 2 comprises divalent [(phen)2Cu(μ-L)Cu(phen)2] complex cations, hydrogensebacate anions, sebacic acid molecules and lattice H2O molecules. In the divalent complex cations, the Cu atoms are each octahedrally coordinated by four N atoms of two phen ligands and two O atoms of one bis-chelating sebacato ligand. The complex cations are assembled via π-π stacking interactions into positively charged 2D network. The hydrogensebacate anions, sebacic acid molecules and H2O molecules build negatively charged 2D hydrogen-bonded networks. Both positively and negatively charged 2D networks are interwoven with each other to generate a novel supramolecular architecture.
One-step template-free solution route for Cu(OH)2 nanowires
Sun, Jinhe,Jia, Yongzhong,Jing, Yan,Yao, Ying,Li, Wu
, p. 36 - 39 (2008)
Cu(OH)2 nanowires with a diameter of 8-10 nm and lengths of tens of micrometers were fabricated in the basic solution by dropping simply NaOH solution into CuCl2 solution at ambient temperature. The formation mechanism of nanowires was discussed. Scanning electron microscopy (SEM), transmission electron microscopy (TEM), and X-ray diffraction (XRD) were used to characterize the samples.
Design and understanding of a high-performance gas sensing material based on copper oxide nanowires exfoliated from a copper mesh substrate
Yang, Fuchao,Guo, Jie,Liu, Mingming,Yu, Shen,Yan, Ningbo,Li, Jing,Guo, Zhiguang
, p. 20477 - 20481 (2015)
We report a novel and facile route to synthesize a 1D needlelike CuO gas sensor utilizing simple solution-treatment, heat-treatment and sonication processes based on copper meshes (CMs) for the first time. We have demonstrated that the architectural 1D CuO sensor displays a substantial improvement of response magnitude toward a series of toxic organic molecules. We expect that our work may provide a new inspiration for synthesizing 1D semiconductor nanowires for gas sensing application.
Low-temperature template synthesis of [4,6,6-trimethyl-2,6-dithioxo-3,7-diazanon-4-enebis(imidothioato)]copper(II) in gelatin-immobilized Cu2[Fe(CN)6] matrix materials
Mikhailov
, p. 1676 - 1681 (2001)
Complexation in gelatin-immobilized copper(II) hexacyanoferrate(II) matrices on contact with alkaline (pH l O) aqueous solutions containing dithiooxamide and acetone was studied. Under these conditions, template synthesis occurs to give the chelate CuL [L
Novel electrochemical sensors based on cuprous oxide-electrochemically reduced graphene oxide nanocomposites modified electrode toward sensitive detection of sunset yellow
He, Quanguo,Liu, Jun,Liu, Xiaopeng,Xia, Yonghui,Li, Guangli,Deng, Peihong,Chen, Dongchu
, (2018)
Control and detection of sunset yellow is an utmost demanding issue, due to the presence of potential risks for human health if excessively consumed or added. Herein, cuprous oxide-electrochemically reduced graphene nanocomposite modified glassy carbon electrode (Cu2O-ErGO/GCE) was developed for the determination of sunset yellow. The Cu2O-ErGO/GCE was fabricated by drop-casting Cu2O-GO dispersion on the GCE surface following a potentiostatic reduction of graphene oxide (GO). Scanning electron microscope and X-ray powder diffractometer was used to characterize the morphology and microstructure of the modification materials, such as Cu2O nanoparticles and Cu2O-ErGO nanocomposites. The electrochemical behavior of sunset yellow on the bare GCE, ErGO/GCE, and Cu2O-ErGO/GCE were investigated by cyclic voltammetry and second-derivative linear sweep voltammetry, respectively. The analytical parameters (including pH value, sweep rate, and accumulation parameters) were explored systematically. The results show that the anodic peak currents of Cu2O-ErGO /GCE are 25-fold higher than that of the bare GCE, due to the synergistic enhancement effect between Cu2O nanoparticles and ErGO sheets. Under the optimum detection conditions, the anodic peak currents are well linear to the concentrations of sunset yellow, ranging from 2.0 × 10?8 mol/L to 2.0 × 10?5 mol/L and from 2.0 × 10?5 mol/L to 1.0 × 10?4 mol/L with a low limit of detection (S/N = 3, 6.0 × 10?9 mol/L). Moreover, Cu2O-ErGO/GCE was successfully used for the determination of sunset yellow in beverages and food with good recovery. This proposed Cu2O-ErGO/GCE has an attractive prospect applications on the determination of sunset yellow in diverse real samples.
Caffeine-mediated synthesis of CuO nanoparticles: characterization, morphology changes, and bactericidal activity
Mary, A. P. Angeline,Ansari, A. Thaminum,Subramanian
, p. 174 - 181 (2021)
This study aims the synthesis of CuO nanoparticles using caffeine as stabilizing agent by precipitation method. The effect of caffeine on the morphology of CuO NPs was studied by varying the concentrations of caffeine. The synthesized CuO NPs were charact
Mild template synthesis of (2,8-dithio-3,7-diaza-4,6-dimethyl-5- oxanonanedithioamido-1,9)copper(II) in Cu2[Fe(CN)6] gelatin-immobilized matrices
Mikhailov
, p. 363 - 368 (2002)
Complexation process in Cu2[(Fe(CN)6] gelatin-immobilized matrices in contact with aqueous solutions of dithiooxamide H2N-C(S)-C(S)-NH2 and ethanal H3C-CHO at pH > 10 were studied. The template synthesis was shown to occur under these specific conditions to yield the Cu(II) chelate with tetradentate (N,N,S,S)-ligand (2,8-dithio-3,7-diaza-4,6-dimethyl-5-oxanonanedithioamide-1,9) with a metal:ligand ratio of 1:1. Dithiooxamide and ethanal therein act as ligand syntones. The reaction scheme was suggested. It was established that this tetradentate ligand is not formed in the absence of Cu(II) in a solution in contact with the matrix. Moreover, the attempts made to obtain the title compound through the reactions of known copper(II) dithiooxamide complexes with ethanal failed.
Mechanisms of the polyol reduction of copper(ii) salts depending on the anion type and diol chain length
Teichert, Johannes,Doert, Thomas,Ruck, Michael
, p. 14085 - 14093 (2018)
The mechanisms of the polyol reduction of copper(ii) compounds were investigated by various systematic experiments. The course of the reduction in ethylene glycol strongly depends on the anion present in solution. Elemental copper can only be obtained in high yields starting from Cu(NO3)2, Cu(OAc)2, or Cu(OH)2; but not from CuCl2 or CuSO4. Intermediate compounds were observed, namely Cu2O, and the alkoxide compounds Cu(C2H4O2) and Cu3(OAc)2(C2H4O2)2. Cu3(OAc)2(C2H4O2)2 was characterised by single-crystal X-ray diffraction. It is a 2D coordination polymer with bridging bidentate acetate and bidentate deprotonated EG ligands leading to vertex- and edge-linked CuO5 polyhedra. Alkoxide compounds were also detected for higher glycol ethers. With growing glycol ether chain length the stability of alkoxide intermediates decreases, enhancing the stability range of Cu2O. Because the majority of copper species is precipitated as copper(ii) alkoxide compounds or Cu2O before the reduction to elemental copper occurs, only few nuclei are formed in solution leading to microparticles instead of nanoparticles. Much smaller but strongly agglomerated particles were observed under alkaline reaction conditions.
Antioxidant resveratrol protects against copper oxide nanoparticle toxicity in vivo
Khalid, Sana,Afzal, Nabeel,Khan, Junaid Ali,Hussain, Zulfia,Qureshi, Anas Sarwar,Anwar, Hafeez,Jamil, Yasir
, p. 1053 - 1062 (2018)
The upsurge in copper oxide nanoparticle (CuONP) applications in various fields triggers hazardous effects on health. Resveratrol, a polyphenol found in plants of stilbene class, has been reported to decrease oxidative stress. The current study investigated the protective effect of resveratrol (RVT) against CuONP-induced hepatotoxicity and nephrotoxicity in male Wistar rats. CuONPs were prepared by precipitation method and characterized by X-ray diffraction (XRD) technique and scanning electron microscopy (SEM). Average crystallite size, lattice parameters (a, b, and c), volume of unit cell, and X-ray density were found to be 33?nm, (a = 4.691??, b = 3.409??, and c = 5.034??), 79.4??3, and 6.506?g/cm3, respectively, from XRD pattern. SEM showed uniform morphology of synthesized nanoparticles. Severe hepatic and renal injury was found in CuONP (300?mg/kg/day intragastrically (i.g.)) group after 7?days as shown by significantly increased serum levels of ALT, AST, creatinine, urea, and total oxidant status along with histopathological alterations. Resveratrol (60?mg/kg) treatment prevented the toxic effects induced by CuONPs. In conclusion, our data showed protective activity of resveratrol against toxic effects of copper oxide nanoparticles presumably through its antioxidant properties. [Figure not available: see fulltext.].
Phase transformation-controlled synthesis of CuO nanostructures and their application as an improved material in a carbon-based modified electrode
Xue, Zhonghua,Li, Mengqian,Rao, Honghong,Yin, Bo,Zhou, Xibin,Liu, Xiuhui,Lu, Xiaoquan
, p. 12829 - 12836 (2016)
Column-shaped CuO nanorods have been synthesized by a two-step "precursor formation-crystallization" process using a hydrothermal method with advantages of being template- and surfactant-free. The regular particle morphology of the as-prepared material was explored to be produced through a good transformation process coupled with a series of phase changes from CuCl, to Cu2(OH)3Cl, to Cu(OH)2, which rely on heat by using NaOH and n-butylamine solution in a sealed vessel, and finally to CuO. Scanning electron microscopy (SEM), energy-dispersive X-ray spectrometry (EDX), X-ray diffraction (XRD), and Raman spectroscopy were employed to characterize the morphology and structures of our samples. The as-prepared CuO nanostructures have been employed to modify a glassy carbon electrode for nonenzymatic glucose oxidation. Compared with the bare glassy carbon electrode, the CuO modified electrode exhibits satisfactory performance with an apparent rate constant of κ as high as 231.0 M-1 s-1 due to its high specific surface area and especially good electron delivery capability of the CuO nanorods.
Kinetic and mechanistic investigations on oxidation of L-tryptophan by diperiodatocuprate(III) in aqueous alkaline medium
Shetti, Nagaraj P.,Nandibewoor, Sharanappa T.
, p. 299 - 317 (2009)
The oxidation of L-tryptophan (L-TRP) by diperiodatocuprate(III) (DPC) in aqueous alkaline medium at a constant ionic strength of 0.20 mol dm-3 was studied spectrophotometrically at 298 K. The reaction between DPC and L-tryptophan in alkaline m
Structure and magnetic properties of polynuclear chloro- and hydroxo-bridged copper(II) complexes formed by a tetramacrocyclic derivative of 1,4,7-triazacyclononane
Battle, Andrew R.,Graham, Bim,Spiccia, Leone,Moubaraki, Boujemaa,Murray, Keith S.,Skelton, Brian W.,White, Allan H.
, p. 289 - 297 (2006)
Two new copper(II) complexes of the ligand 1,2,4,5-tetrakis(1,4,7- triazacyclononan-1-ylmethyl)benzene (Ldur) have been synthesized and characterized by single crystal X-ray studies. The first, [Cu4L dur(μ2-OH)4]Cl2(PF 6)2·8H2O (1), was isolated from a solution of Ldur and Cu2+ at pH 9. Under acidic conditions (pH 3), a polymeric complex, {[Cu4Ldur(μ2- Cl)6](PF6)2·10H2O} n (2), crystallized from solution. In both complexes, each of the four triazacyclononane (tacn) rings of the Ldur ligand facially coordinate to separate metal centres. Pairs of Cu(II) centres are then doubly-bridged by hydroxo groups in 1, leading to tetranuclear complex cation units featuring pairs of isolated copper(II) dimers with Cu2(μ 2-OH)2 cores folded at the O·O lines. Two forms of the tetranuclear units, featuring slightly different Cu2(μ 2-OH)2 core geometries, are present in equal amounts within the crystal lattice. In complex 2, chloro bridging ligands link pairs of Cu(II) centres from neighbouring tetranuclear units, forming a 1D helical polymeric structure. Variable-temperature magnetic susceptibility measurements suggest that the hydroxo-bridged copper(II) centres within one of the tetranuclear units in 1 are weakly antiferromagnetically coupled (J = -27 cm-1), whilst those in the other interact ferromagnetically (J = +19 cm-1). Similar measurements indicate weak ferromagnetic coupling (J = +16 cm-1) for the chloro-bridged copper(II) centres in 2.
New method for the synthesis of cage and polymeric metallosiloxanes
Zhdanov,Sergienko,Trankina
, p. 2448 - 2450 (1998)
Cage organometallosiloxanes were synthesized according to a new procedure using monomeric organoalkoxysilanes as the starting compounds. The latter were subjected to hydrolysis immediately before the exchange reaction of sodium silanolate with metal halides. Difficultly accessible metallovinylsiloxanes, metallomethylsiloxanes, and metallosiloxanes containing a functional group in the organic radical at the silicon atom can be readily prepared according to the method proposed.
CuO{001} as the Most Active Exposed Facet for Allylic Oxidation of Cyclohexene via a Greener Route
Mal, Diptangshu Datta,Kundu, Joyjit,Pradhan, Debabrata
, p. 362 - 372 (2021)
Allylic oxidation of olefins to α,β-unsaturated carbonyl compounds, especially2-cyclohexen-1-one, by the oxidation of cyclohexene is a prime chemical transformation in the organic industry due to its immense application as an intermediate in the synthesis of fine chemicals, pharmaceutical products, and perfumery products. Herein, we demonstrate microstructured copper oxide (CuO) as an efficient catalyst to oxidize cyclohexene to 2-cyclohexen-1-oneand other value-added intermediates in the presence of aerobic molecular oxygen as oxidant at 80 °C with outstanding conversion of cyclohexene and high selectivity towards 2-cyclohexen-1-one. CuO with diverse shapes was synthesized by a one-step hydrothermal method. CuO plates (PLs) and flowers (FLs) were obtained by varying the ammonia and sodium hydroxide concentration, and CuO spheres (SPs) and hollow spheres (HSs) were prepared by varying the urea concentration. Under optimized conditions, the CuO FL2 catalyst shows the highest conversion of cyclohexene (97.6 %) due to its smaller size, higher surface charge, and high-energy {001} exposed facets. Reaction parameters such as reaction temperature, reaction duration, and catalyst concentration were varied to obtain the optimal reaction conditions for cyclohexene oxidation. Moreover, the CuO FL2 catalyst was recycled several times without any significant loss of catalytic activity, which ascertains recyclability and high stability of the catalyst for industrial use.
Structural characterization, ROS-inductive and proteasome inhibitory properties of ternary and binary copper(II) complexes of N2- and N2O2-ligands
Chan, Cheang Wei,Lai, Jing Wei,Ooi, Ing Hong,Er, Hui Meng,Chye, Soi Moi,Tan, Kong Wai,Ng, Seik Weng,Maah, Mohd Jamil,Ng, Chew Hee
, p. 202 - 210 (2016)
The four copper(II) complexes involving ethylenediamine-N,N-diacetic acid (H2edda) and ethylenediamine (en), viz. [Cu(edda)(en)]H2O 1, [Cu(en)Cl2] 2, [Cu(edda)] 3 and [Cu2(Hedda)2Cl2] 4, were synthesized and characterized by various physical means. The crystal structures of 1 and 4 established them as mononuclear and dichlorido-bridged dicopper(II) complexes respectively. Complexes 1 and 4 showed weak and strong antiferromagnetic Cu...Cu interaction. Dynamic light scattering data of 3 suggested it to be a 3-dimensional coordination polymer in aqueous solution, gel and solid forms. The copper(II) species of 1-4 in aqueous solution were analysed by UV-visible and molar conductivity data. The weak hydroxyl radical-inducing property of free copper(II) ions in solution was enhanced by the chelation of both types of ligands. However, chelation of each or both of these ligands reduce the strong proteasome inhibitory property of the copper(II). All complexes inhibited the three proteolytic sites of the 20S proteasome, with the Trypsin-like site been mostly selectively inhibited.
In situ structure evolution from Cu(OH)2 nanobelts to copper nanowires
Wang, Zhong Lin,Kong, Xiang Yang,Wen, Xiaogang,Yang, Shihe
, p. 8275 - 8280 (2003)
In situ structural evolution from Cu(OH)2 nanobelts to copper nanowires has been studied by transmission electron microscopy in a vacuum of 3 × 10-8 Torr. The decomposition follows the sequence of Cu(OH)2 → CuO → Cu2O → Cu. The decomposition from Cu(OH)2 to CuO is attributed to electron beam radiation damage. The reduction from CuO to Cu2O is attributed to heat-induced decomposition between 50 and 200°C. For the Cu(OH)2 nanobelts synthesized using the copper grid with and without a carbon coating, the decomposition from Cu2O to Cu takes place between 200 and 300°C and 300 and 600°C, and the final Cu takes the forms of polycrystalline nanowires sheathed with graphitic carbon and nanoparticles, respectively. Therefore, because of the nanostructured nature of the nanowires and large surface area, introducing carbon into the sample synthesis can reduce the decomposition temperature by almost half. This study demonstrates a possible approach for creating metallic copper nanowires by heat-induced decomposition under vacuum at 300°C or even lower.
Bhattacharjee, Manabendra N.,Chaudhuri, Mihir K.,Devi, Minakshi
, p. 457 - 462 (1989)
Coordination compounds of 3d-metal 5-sulfosalicylates with thiosemicarbazide
Koksharova,Kurando,Stoyanova
, (2013)
Copper(II), nickel(II), and cobalt(III) 5-sulfosalicylate complexes with thiosemicarbazide were synthesized and characterized by elemental analyses, IR spectra, diffuse reflectance spectra, and thermo-gravimetric data.
Cu(II) and Zn(II) complexes incorporated with active analogue fragments molecule of the aristolochic acid: Crystal structure and biological activity
Feng, Jing,Lei, Yi-Zhu,Wang, Ren-Shu,Wang, Yuan-Lan
, (2021/12/21)
Two complexes, [Cu(MDPAc)2(Phen)(H2O)·H2O] (MDPAc = 3,4-(methylenedioxy)phenylacetic-carboxylate, Phen = 1,10-Phenanthroline) and [Zn(MDPAc)2(2,2′-bipy)] (2,2′-bipy = 2,2′-bipyridine), were synthesized and succe
A comparative Study Between Fluka and Microshield Modeling Calculations to study the Radiation-Shielding of Nanoparticles and Plastic Waste composites
El-Taher, Atef,Zakaly, Hesham M. H.,Pyshkina, Mariia,Allam, Elhassan A.,El-Sharkawy, Rehab M.,Mahmoud, Mohamed E.,Abdel-Rahman, Mohamed A. E.
, p. 1083 - 1090 (2021/04/09)
A comparative study has been conducted by using Monte Carlo FLUKA code and Microshieldsoftware programs to study the radiation shielding properties of plastic waste mixed with nano copper oxide (CuO) and phosphotungstic acid (PTA). The variousdiverse percentages of new nanocomposite have been prepared using the compression moulding technique, then they are characterized using Fourier transfer infrared spectrophotometer (FT-IR), thermal gravimetric analysis (TGA), X-ray diffraction (XRD). The new nanocomposite has been established as a effective shielding material towards gamma radiation due to the presence of dense materials, like nano copper oxide and phosphotungstic acid. The gamma radiation attenuation has been established by using the previously mentioned methods. The results have proved that the mass attenuation coefficients (μm) and effective atomic (Zeff), and electron densities (Nel) of the samples increased with increasing the phosphotungstic acid (PTA) content while the half-value layer (HVL), the tenth value layer (TVL), and the mean free path (MFP) decreased as PTA increased.
