Reduced rate constants of photoinduced electron transfer in intramolecular fluorescence quenching of donor-acceptor podands induced by cation-complexation are observed in the highly exothermic reactions.
A new ligand 25, 26, 27, 28-tetrakis[2-(o-methoxyphenoxy)ethoxy]calix[4]arene 3 was synthesized by direct base-strength-driven O-alkylation of calix[4]arene 1. 3 has been used as ionophore for cesium selective PVC mem...A new ligand 25, 26, 27, 28-tetrakis[2-(o-methoxyphenoxy)ethoxy]calix[4]arene 3 was synthesized by direct base-strength-driven O-alkylation of calix[4]arene 1. 3 has been used as ionophore for cesium selective PVC membrane electrode. The extraction for cesium and sodium with 3 have been also studied.展开更多
The extraction of Zr(Ⅳ) from nitric acid solution with amido polands PAⅡ、PAⅤ [1] was studied.The effects of the concentration of Zr(Ⅳ) and HNO 3,salting out agent(NaNO 3) and extractant on the distribution ratios...The extraction of Zr(Ⅳ) from nitric acid solution with amido polands PAⅡ、PAⅤ [1] was studied.The effects of the concentration of Zr(Ⅳ) and HNO 3,salting out agent(NaNO 3) and extractant on the distribution ratios were observed,the results show that the extractant PAⅡ is satisfactory for the extraction of Zr(Ⅳ) but there appears a serious emergence of third phase when the concentration of salting out agent and the rate of the concentration of the extractant/Zr(Ⅳ) is over some range and PAⅤ is of disadvantage on the extraction of Zr(Ⅳ).展开更多
基金We are grateful to the National NatUral Science Foundation of China for support this work.!(grantNO. 29733100)
文摘Reduced rate constants of photoinduced electron transfer in intramolecular fluorescence quenching of donor-acceptor podands induced by cation-complexation are observed in the highly exothermic reactions.
文摘A new ligand 25, 26, 27, 28-tetrakis[2-(o-methoxyphenoxy)ethoxy]calix[4]arene 3 was synthesized by direct base-strength-driven O-alkylation of calix[4]arene 1. 3 has been used as ionophore for cesium selective PVC membrane electrode. The extraction for cesium and sodium with 3 have been also studied.
文摘The extraction of Zr(Ⅳ) from nitric acid solution with amido polands PAⅡ、PAⅤ [1] was studied.The effects of the concentration of Zr(Ⅳ) and HNO 3,salting out agent(NaNO 3) and extractant on the distribution ratios were observed,the results show that the extractant PAⅡ is satisfactory for the extraction of Zr(Ⅳ) but there appears a serious emergence of third phase when the concentration of salting out agent and the rate of the concentration of the extractant/Zr(Ⅳ) is over some range and PAⅤ is of disadvantage on the extraction of Zr(Ⅳ).