Monovalent Copper Ions Research Articles

Far-infrared studies of the phase transition and conduction mechanism in the fast-ion conductors Ag2HgI4 and Cu2HgI4.

A study of the temperature dependence of the far-infrared reflectance of the fast-ion conductors ${\mathrm{Ag}}_{2}$${\mathrm{HgI}}_{4}$ and ${\mathrm{Cu}}_{2}$${\mathrm{HgI}}_{4}$ has been completed. These materials are unusual in that the transition into the fast-ion conducting state is first order with a disordering of several cation species, but no reconstitution or symmetry change of the ``rigid'' anion sublattice. By examining the temperature dependence of the phonon lifetimes, we find that the phase transition into the fast-ion state occurs more rapidly than in typical fast-ion materials such as AgI. In addition, the low-frequency modes are strongly anharmonic and tightly coupled to the mobile ions. We conclude that the existence of three disordering ion species (monovalent silver or copper ions, divalent mercury ions, and vacancies) leads to a two-component disordering, where the mercury ions act to block the monovalent cation and vacancy disordering.

Synthesis and investigation of new 5,6-benzoquinoline derivatives

New 5,6-benzo-2,2′-diquinolyl derivatives were synthesized by the reaction of quinolidene-β-naphthylamine with diacetyldiphenylmethane, diacetyldiphenyl oxide, and diacetyldiphenyl sulfide in the presence of catalytic amounts of concentrated HCl. The electronic absorption spectra of the synthesized compounds were studied, the conditions of the formation of the complexes with monovalent copper ions were determined, and a dependence between the structure and the color of the complexes was demonstrated.

The Oxidation of a Monophase Co-8.03 Wt% Cu Alloy at 700 to 1000 C

Abstract The oxidation of a monophase cobalt-copper alloy at high temperature has been Studied to examine the effect of the copper addition to cobalt on the oxidation kinetics as well as on the scale morphology and composition. The rate law remains parabolic as for pure cobalt but the rate constant is higher at all temperatures. This result is interpreted as being due mainly to the doping of CoO by monovalent copper ions by means of a detailed calculation of the rate constant for the alloy making use of the experimental profile of the copper concentration in the scale and of a suitable model for the defect structure of cobalt oxide.

Copper-exchanged zeolite catalysts for the cyclodimerization of butadiene: II. Catalyst structure

An X-ray structure analysis has been carried out on a single crystal of natural faujasite which has been exchanged with Cu 2+ ions, dehydrated at 150 °C, and then exposed to butadiene vapor at room temperature. Copper ions have been located at sites I′, II, II′, and III. The adsorption of butadiene is shown to induce a migration of copper cations to site III, located at the pore entrances to the supercages. The unsaturated coordination of the cations to the zeolite framework, and their ideal location for interaction with adsorbate molecules, suggests that these are most probably the sites where the butadiene cyclodimerization reaction occurs. Some comparative data on a novel homogeneous copper catalyst suggest that the role of the zeolite framework is simply to stabilize monovalent copper ions and is not responsible for the high selectivity toward 4-vinylcyclohexene.

Effect of UV irradiation on Cu +-containing glasses

Optical absorption spectra of copper-containing silicate glasses were determined and the effects of UV irradiation on the spectra were studied. Oxalic acid was used as a reducing agent in order to obtain monovalent copper ions. Several absorption bands were observed as a result of UV irradiation at wavelengths of 430–480, 565–570, 620–690, 720–790, 800–900 and 307–310 nm. These bands were interpreted in terms of photochemical reaction and attributed to color centers, cupric ions (Cu 1++), metastable copper atoms (Cu o), and aggregates of copper atoms which were induced by UV irradiation.

Paramagnetic resonance of copper atoms stabilized in alkali‐halide crystals

AbstractStabilized copper atoms are obtained at 77°K by irradiating alkali halide crystals (LiCl, NaCl and KCl) containing monovalent copper ions with X‐rays. The properties of these stabilized atoms are studied by PR (paramagnetic resonance). In the paramagnetic resonance spectra a super‐hyperfine structure is observed indicating a substitutional position of the stabilized copper atoms in the cubic lattice of the alkali halide crystals. An interpretation of the data obtained is given.

Investigation on Mixed Complexes. II. Cyano Complexes of Copper and Nickel

Abstract 1. Mixed amino-cyano nickel(II) complexes, such as [Ni en2(CN)2], [Nien·(CN4)4]−2 and [Ni en(CN)2] in the solution containing the divalent nickel ion, ethylene-diamine and cyanide ion, are not formed. 2. In the solution containing the divalent or the monovalent copper ion, ethylene-diamine and the cyanide ion, no mixed amine-cyano copper(I) and copper(II) complexes are formed, except the copper-(II) complex of coordination number 5. 3. Among cyano copper(I) complexes, tricyano copper(I) ion is the most stable, and its coordination number may be 3.