By using XPS method the valence of thulium in ternary iodides CsTmI3, Cs2TmI4, RbTmI3 and KTmI3 has been studied. The identification of the valence of thulium in these compounds was made by comparing the observed chem...By using XPS method the valence of thulium in ternary iodides CsTmI3, Cs2TmI4, RbTmI3 and KTmI3 has been studied. The identification of the valence of thulium in these compounds was made by comparing the observed chemical shift of Tm4d bonding energy with those of thulium in TmI2 and TmI3. The results indicate that the thulium in its ternary iodides has a valence of +2.展开更多
Hydrogen peroxide was supported on polyvinylpyrrolidone to afford a stable and mild oxidizing reagent. Activated aromatic compounds were reacted with PVP-H2O2 in the presence of KI or I2 and a catalytic amount of H3PW...Hydrogen peroxide was supported on polyvinylpyrrolidone to afford a stable and mild oxidizing reagent. Activated aromatic compounds were reacted with PVP-H2O2 in the presence of KI or I2 and a catalytic amount of H3PW12O40 in refluxing CH2Cl2 to afford the corresponding iodinated arenes.展开更多
文摘By using XPS method the valence of thulium in ternary iodides CsTmI3, Cs2TmI4, RbTmI3 and KTmI3 has been studied. The identification of the valence of thulium in these compounds was made by comparing the observed chemical shift of Tm4d bonding energy with those of thulium in TmI2 and TmI3. The results indicate that the thulium in its ternary iodides has a valence of +2.
文摘Hydrogen peroxide was supported on polyvinylpyrrolidone to afford a stable and mild oxidizing reagent. Activated aromatic compounds were reacted with PVP-H2O2 in the presence of KI or I2 and a catalytic amount of H3PW12O40 in refluxing CH2Cl2 to afford the corresponding iodinated arenes.
