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Vol 473, No 1 (2017)
- Year: 2017
- Articles: 6
- URL: https://journals.rcsi.science/0012-5008/issue/view/9253
Chemistry
Chemistry of the CARBOFTOREX process. Identification of the absorption bands of the ligands in the electronic spectra of aqueous solutions of uranyl fluoride
Abstract
The electronic absorption bands of aqueous solutions of the [UO2F2(H2O)n] complex were assigned taking into account dissociation, hydration, association, and ligand exchange. The absorption in the range of 190–400 nm was found to be related to the formation of cationic, neutral, and anionic complex species, [UO2F2(H2O)n].
37-42
Chemistry of the CARBOFTOREX process. Identification of the absorption bands of the ligands in the electronic spectra of aqueous solutions of U(VI) fluoride carbonate complexes
Abstract
The electronic absorption bands of U(VI) fluoride carbonate and fluoride hydroxide complexes were assigned taking account of dissociation, hydration, association, and ligand exchange. The absorption in the range of 190–400 nm was found to be related to the formation of neutral and dissociated anionic U(VI) fluoride carbonate and fluoride hydroxide complexes and the polynuclear Na2n[(UO2–O–UO2)F4(OH)2n–1 ∙ kH2O] complex.
43-48
49-52
Sulfur-containing polymer and carbon materials based on poly(vinyl chloride)
Abstract
New sulfur-containing copolymers based on poly(vinyl chloride) have been prepared by the nucleophilic substitution of chlorine atoms by sulfur atoms using sodium tetra- and pentasulfides. It has been shown that these copolymers can be carbonized to produce sulfur-containing carbon materials with residual chlorine content about 2 wt %.
53-56
Trinuclear adducts of cobalt diketonates based on di-o-quinone with a bis(chelate) linker: Computational search for spin qubits
Abstract
Computer modeling (DFT UB3LYP*/6-311++G(d,p)) of trinuclear cobalt diketonate adducts based on di-o-quinone containing a bis(chelate) linker has been performed. Calculations predict the stability of the compounds to dissociation into the initial molecules. It has been demonstrated that rational choice of the metal atom of the bis(chelate) linker and the type of ancillary ligand of the terminal moieties makes it possible to find a system exhibiting the properties of logical elements of quantum computers—spin qubits.
57-62
Chemistry of the CARBEX process. Identification of the absorption bands of the ligands in the electronic spectra of U(VI) extracts with methyltrioctylammonium carbonate
Abstract
The electronic absorption bands of extracts of the Na4[UO2(O2)(CO3)2] complex with methyltrioctylammonium (MTOA) carbonate were assigned taking into account hydration, hydrolysis, dissociation, polymerization, and ligand exchange, which occur in aqueous and organic solutions. It was shown that the extractable compound, (R4N)4[UO2(O2)(CO3)2], present in low concentrations in the organic phase partly dissociates by one step to give the (R4N)3[UO2(O2)(CO3)2]– anions, while at high concentrations, it is converted to polynuclear complex.
63-66