16828-95-8Relevant articles and documents
Studies on the Pre-edge Region of the X-Ray Absorption Spectra of Copper(I) Oxide and the Diamminecopper(I) Ion
Moen, Arild,Nicholson, David G.,Ronning, Magnus
, p. 3189 - 3194 (1995)
The distinctive pre-edge feature in the X-ray absorption spectra of copper(I) oxide and the diamminecopper(I) ion at the copper K-edge has been studied using synchrotron radiation.The relative intensities of these features, which are characteristic of cop
Control of chemical reaction involving dissolved oxygen using magnetic field gradient
Aoyagi, Satoka,Yano, Akira,Yanagida, Yasutaka,Tanihira, Eiji,Tagawa, Akio,Iimoto, Mitsuo
, p. 137 - 141 (2006)
This study investigated the control of dissolved oxygen concentration using magnetic forces from gradient magnetic fields near a Nd-Fe-B permanent magnet. Maximum values of magnetic flux density and the product of the magnetic flux density and its gradient were 0.63 T and 44 T2/m, respectively. The magnet was placed under a Petri dish filled with 15 ml of 10% ammonia water. The Petri dish had a copper sheet in the center. Absorbance of tetraamminecopper(II) complex produced by the reaction in oxygen was measured using a spectrophotometer to observe oxygen concentration. Results showed that the magnetic field quantitatively enhanced tetraamminecopper(II) complex production. Moreover, remarkable enhancement of the copper complex production occurred in the magnetic field at less than 2 mm depth. The calculated magnetic force increase near the magnet surface supports this result. These results show that greater enhancement of the reaction rate occurs when the stronger magnetic force acts on oxygen molecules.
Control of Heterometallic Three-Dimensional Macrocycles with Aromatic Stacks in Tunable Host Cavities
Gao, Wen-Xi,Fan, Qi-Jia,Lin, Yue-Jian,Jin, Guo-Xin
, p. 594 - 598 (2018)
Using coinage metal (Cu(II), Ag(I)) hinges, two sets of heterometallic molecular capsules with analogous open-ended cavities were prepared based on the half-sandwich rhodium fragments. In the case of [Rh4Cu4] cages, up to six-fold-stacked host-guest structures were formed by varying the cavity's dimensions. Moreover, the series of capsules were demonstrated to self-fine-tune to form multi-heteroguest arrays via favourable donor-acceptor π interactions and Ag-π interactions, as evidenced from single-crystal X-ray analysis.
Dawson,Crae, Mc
, p. 1239 - 1239 (1900)
Unprecedented [d9]Cu?[d10]Au coinage bonding interactions in {Cu(NH3)4[Au(CN)2]}+[Au(CN)2]?salt
Andreo, Jacopo,Frontera, Antonio,Mahmoudi, Ghodrat,Priola, Emanuele
, p. 7268 - 7271 (2021)
The X-ray structure of the {Cu(NH3)4[Au(CN)2]}+[Au(CN)2]?salt is reported showing an unprecedented [d9]Cu?[d10]Au coinage bond. The physical nature of the interaction
The estimation of the stability of ionite complexes formed in the sorption of copper cations by weakly alkaline AM-7 anionite
Chelnakova,Kolodyazhnyi,Volkova
, p. 2122 - 2125 (2008)
The sorption of copper cations by the complex-forming AM-7 anionite was studied. It was shown that the sorption of copper ions from aqueous solutions was satisfactorily described by the Langmuir equation. The linear approximation to this equation can be u
Temperature-Induced Stacking to Create Cu2O Concave Sphere for Light Trapping Capable of Ultrasensitive Single-Particle Surface-Enhanced Raman Scattering
Li, Xiaoxia,Shang, Yang,Lin, Jie,Li, Anran,Wang, Xiaotian,Li, Bin,Guo, Lin
, (2018)
The fabrication of bowl or concave particles with “asymmetric centers” has drawn considerable attentions, in which multiple scattering occurs inside the particles and the ability of light scattering is distinctly enhanced. However, the limited variety of templates, the uncontrollable dimensions such as the size of concavity and the complex growth process have posed serious limitations to the reproducible construction of concave particles with desired geometries and their light-trapping properties. Herein, a “temperature-induced stacking” strategy is proposed to create controllable concavity Cu2O spheres for the first time. Different sizes of F68 micelles can be formed through aggregation under different reaction temperatures, which can serve as soft template to tailor concave geometries of Cu2O spheres. The as-prepared Cu2O concave sphere (CS) can serve as single-particle (SP) surface-enhanced Raman scattering (SERS) substrate for highly repeatable and consistent Raman spectra. The unique cavity of Cu2O CS entraps light effectively, which also enhances the scattering length owing to multiple light scattering. Combined with slightly increased surface area and charge-transfer process, Cu2O CS exhibits remarkable single-particle SERS performance, with an ultralow low detection limit (2 × 10?8 mol L?1) and metal comparable enhancement factor (2.8 × 105).
Coordination of the Copper Centers in Particulate Methane Monooxygenase: Comparison between Methanotrophs and Characterization of the CuCSite by EPR and ENDOR Spectroscopies
Doan, Peter E.,Hoffman, Brian M.,Jodts, Richard J.,Koo, Christopher W.,Rosenzweig, Amy C.,Ross, Matthew O.
supporting information, p. 15358 - 15368 (2021/09/29)
In nature, methane is oxidized to methanol by two enzymes, the iron-dependent soluble methane monooxygenase (sMMO) and the copper-dependent particulate MMO (pMMO). While sMMO’s diiron metal active site is spectroscopically and structurally well-characterized, pMMO’s copper sites are not. Recent EPR and ENDOR studies have established the presence of two monocopper sites, but the coordination environment of only one has been determined, that within the PmoB subunit and denoted CuB. Moreover, this recent work only focused on a type I methanotrophic pMMO, while previous observations of the type II enzyme were interpreted in terms of the presence of a dicopper site. First, this report shows that the type IIMethylocystisspecies strain Rockwell pMMO, like the type I pMMOs, contains two monocopper sites and that its CuBsite has a coordination environment identical to that of type I enzymes. As such, for the full range of pMMOs this report completes the refutation of prior and ongoing suggestions of multicopper sites. Second, and of primary importance, EPR/ENDOR measurements (a) for the first time establish the coordination environment of the spectroscopically observed site, provisionally denoted CuC, in both types of pMMO, thereby (b) establishing the assignment of this site observed by EPR to the crystallographically observed metal-binding site in the PmoC subunit. Finally, these results further indicate that CuCis the likely site of biological methane oxidation by pMMO, a conclusion that will serve as a foundation for proposals regarding the mechanism of this reaction.
