Vinylic substitution on troponoid catalyzed by palladium complexes,and formation of new C-pd σ-complexes of troponoid

The reaction of 3-, 4- and 5-halotropolones with olefins catalyzed by palladium (O) complex gave 3-, 4- and 5-(substituted vinyl) tropolones respectively. Similarly, 2-chlorotropone gave 2-styryltropones. Some tropolonyl- and troponylpalladium-σ-complexes were synthesized.     

Growth of isotopically enriched Si nanowires

The isotopically enriched silicon (²⁸Si) nanowires have been fabricated by using the floating-zone (FZ) melting vapour method. The growth of the nanowires was performed in the top area, 1.52 cm from the floating melting zone (2 mm width) of a raw material bar under a flow of Ar gas. Field emission scanning electron microscopy and transmission electron microscopy analyses revealed that the nanowires of isotopically enriched ²⁸Si crystalline had diameters ranging from 2050 nm and lengths of several hundreds of micrometres. The special structure of the tip of the isotopically enriched ²⁸Si nanowires was observed.     

Study of the complexes of Np(V) with organic ligands by solvent extraction with TTA and 1, 10-phenanthroline

Complex formation constants of Np(V) with 22 organic ligands, 7 hydroxycarboxylic acids, 4 dicarboxylic acids, 4 aminocarboxylic acids, 3 pyridinecarboxylic acids, 8-hydroxyquinoline-5-sulfonic acid, IDA, NTA and EDTA, have been determined in 1M NaClO₄ at 25°C by using the solvent extraction method with TTA and 1, 10-phenanthroline. The factors influencing the stabilities of Np(V) complexes are discussed in connection with the linear structure of NpO₂⁺.     

Mechanism of metal-ion sorption on hydrous metal oxides

A model for treating the sorption of metal ions on hydrous metal oxides was established based on the assumptions that these materials are weakly acidic cation exchangers and have a discrete exchanger phase. The experimental results of the sorption of metal ions on the hydrous niobium(V) and tin(IV) oxides are found to be consistent with the formulas derived from the model by considering that the charge balance and the mass action law hold in the exchanger phase and cations are sorbed by the distribution between this phase and the bulk aqueous phase.