21393-59-9Relevant articles and documents
Cuprous hydroxide in a solid form: Does it exist?
Soroka, Inna L.,Shchukarev, Andrey,Jonsson, Mats,Tarakina, Nadezda V.,Korzhavyi, Pavel A.
, p. 9585 - 9594 (2013)
Experimental studies have been performed to obtain the unknown cuprous hydroxide compound, which has recently been predicted theoretically (P. A. Korzhavyi et. al., Proc. Natl. Acad. Sci. U. S. A., 2012, 109, 686-689) to be metastable in a solid form. The reduction of Cu2+ with ferrous ethylenediamine tetraacetate (EDTA) results in the formation of a yellow powder precipitate whose composition corresponds to CuOH × H2O as probed by Fourier Transform Infrared Spectroscopy (FTIR) and cryogenic X-ray Photoelectron Spectroscopy (XPS). A similar compound has been found on the surface of Cu-CuH powder stored in water, as detected by XPS. The reduction of Cu2+ to Cu+ with free radicals in aqueous solutions results in a Cu2O precipitate as the final product, while the formation of the yellow cuprous hydroxide colloids may be an intermediate step. Our studies reveal that cuprous hydroxide does exist in a solid form and most likely has a hydrated form, CuOH × H2O. The Royal Society of Chemistry 2013.
Scanning electrochemistry microscopy (SECM) in the study of electron transfer kinetics at liquid/liquid interfaces: Beyond the constant composition approximation
Barker, Anna L.,Unwin, Patrick R.,Amemiya, Shigeru,Zhou, Jungfen,Bard, Allen J.
, p. 7260 - 7269 (1999)
A numerical model is developed for the SECM feedback mode for the case of irreversible electron transfer (ET) processes at the interface between two immiscible electrolyte solutions (ITIES). In this application, a redox-active species is electrogenerated by the reduction/oxidation of the oxidized/reduced form of a couple at an ultramicroelectrode (UME) tip located in one liquid (phase 1). The tip is positioned close to the interface with a second immiscible liquid (phase 2), that contains the oxidized/reduced half of another redox couple. If ET occurs between the tip-generated species in phase 1 and the redox-active species in phase 2, then the original species in phase 1 is regenerated at the interface and undergoes positive feedback at the tip, enhancing the steady-state current. The feedback current, for a given separation between the tip and the interface, is shown to depend on the ratio of the concentrations of the redox-active species in the two phases, their relative diffusion coefficients, and the rate constant for the redox reaction. The results of the model are used to identify the conditions under which (i) diffusion in phase 2 has to be considered and; (ii) a simpler limiting (constant composition) model for phase 2, employed to analyze earlier SECM experiments, can be used. In addition to diversifying the range of conditions under which redox reactions at ITIES can be studied, the results of the model demonstrate that there are considerable advantages to lifting the constant composition restriction on phase 2 for the accurate characterization of rapid redox reactions. The theoretical predictions are examined through experimental studies of electron transfer between the electrogenerated, oxidized form of zinc-21H, 23H-tetraphenylporphine (ZnPor) in benzene or benzonitrile and the reductants Fe(CN)64-, Ru(CN)64-, Mo(CN)84-, or FeEDTA2- (where EDTA denotes ethylenediaminetetraacetic acid) in an aqueous solution. Bimolecular rate constants for each of these systems are reported, with the potential across the ITIES biased with either perchlorate or tetrafluoroborate ions in each phase.
Thermal degradation of EDTA chelates in aqueous solution
Motekaitis, Ramunas J.,Cox, III, X. B.,Taylor, Patrick,Martell, Arthur E.,Miles, Brad,Tvedt, Tory J. Jr.
, p. 1207 - 1213 (1982)
The termal degradation of Ca(II), Mg(II), Zn(II), Fe(II), and Ni(II) chelates of EDTA was investigated in alkaline aqueous solution at elevated temperatures (230-310 degC).The kinetics of decomposition were followed by nmr, titrimetry, and spectrophotometry.Reaction products were identified through nmr and by gas chromatography.The relative order of degradation rates, as measured by the loss of EDTA, was found to be Mg(II)>Ca(II)>Zn(II)>Fe(II)>Ni(II).The main degradation products formed in the lower temperature range (cca. 250 degC) are iminodiacetic acid,hydroxyethyliminodiacetic acid, and ethylene glycol.Higher temperature products are primarily dimethylamine and carbon dioxide.The rates of degradation of Ca(II), Mg(II), and Zn(II) EDTA chelates are considerably enhanced when either phosphate is present or a glas-lined autoclave is employed.
ALGICIDAL COMPOUND
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A new algicidal compound is devised.
