Study on transport of Dy(Ⅲ) by dispersion supported liquid membrane

The transport of Dy（III） through a dispersion supported liquid membrane （DSLM） consisting of polyvinylidene fluoride membrane （PVDF） as the liquid membrane support and dispersion solution including HCI solution as the stripping solution and 2-ethyl hexyl phosphonic acid-mono-2-ethyl hexyl ester （PC-88A） dissolved in kerosene as the membrane solution, was studied. The effects of pH value, initial concentration of Dy（III） and different ionic strength in the feed phase, volume ratio of membrane solution and stripping solution, concentration of HCl solution, concentration of carrier, different stripping agents in the dispersion phase on transport of Dy（III） were also investigated, respectively. As a result, when the concentration of HCI solution was 4.0 mol/L, concentration of PC-88A was 0.10 mol/L, and volume ratio of membrane solution and stripping solution was 40：20 in the dispersion phase, and pH value was 5.0 in the feed phase, the transport effect of Dy（III） was the best. Ionic strength had no obvious effect on transport of Dy（III）. Under the optimum condition studied, when initial concentration of Dy（III） was 0.8×10^-4 mol/L, the transport rate of Dy（III） was up to 96.2% during the transport time of 95 rain. The kinetic equation was developed in terms of the law of mass diffusion and the theory of interface chemistry. The diffusion coefficient of Dy（III） in the membrane and the thickness of diffusion layer between feed phase and membrane phase were obtained and the values were 1.99×10^-7 m^2/s and 15.97 μm, respectively. The results were in good agreement with experimental results.

Synthesis,Structure and Photochromism of a New Diarylethene and Its Ag(Ⅰ) Complex

A new symmetric diarylethene containing cyano group was synthesized and structurally characterized by elemental analysis,IR,1 H NMR and X-ray single-crystal diffraction.It belongs to the monoclinic system,space group C2/c with a = 18.848（6）,b = 8.561（2）,c = 16.875（5） ？,β = 100.398（6）o,V = 1344.6（11） ？~3,Z = 4,μ = 0.262 mm^（-1）,Dc = 1.415 g/cm^3,Mr = 570.56,F（000） = 1160,the final R = 0.0808 and wR = 0.2107 with I 〉 2σ（I）.The two thienyls adopt reactive anti-parallel conformation and the carbon distance of photocyclization is 3.57 ？.The neighboring molecules are stacked closely with C-H…F hydrogen bonding.In addition,the photochromism of the new compound was investigated in solvents with different polarity and PMMA film.The alternative photo-irradiation of 254 nm light and ≥550 visible light can induce the reversible photo-cyclization and photo-reversion with the color interconversion between colorlessness and blue.In THF solution,the λ（max） of diarylethene in PSS in visible band is 585 nm.The diarylethene further reacted with AgBF4 in benzene to give rise to complex 1,which was structurally characterized by elemental analysis,IR,ESI-MS and TG.1 demonstrated reversible photochromism in both solution and PMMA film.The complexation of metal ions with diarylethene leads to a minor red-shift of the λ（max） of 1 in THF in PSS to 590 nm.

La(Ⅲ) Transport in Dispersion Supported Liquid Membrane Including PC-88A as the Carrier and HCl Solution as the Stripping Solution

The transport of La(III) through a dispersion supported liquid membrane with polyvinylidene fluoride membrane as the liquid membrane support and dispersion solution including HCl solution as the stripping solution and 2-ethylhexyl phosphonic acid mono-2-ethylhexyl ester (PC-88A) in kerosene as the membrane solution, was studied. As a result, the optimum transport conditions of La(Ⅲ) were obtained as that concentration of HCl solution was 4.0 mol/L, concentration of PC-88A 0.16 mol/L, and volume ratio of membrane to stripping solution 30:30 in the dispersion phase, and pH value 4.0 in the feed phase. Ionic strength had no obvious effect on the transport of La(Ⅲ). Under the optimum conditions, when initial concentration of La(Ⅲ) was 0.8×10-4 mol/L, the transport rate was up to 96.3% during the transport time of 125 min. The kinetic equation was developed based on the law of mass diffusion and theory of interface chemistry. The diffusion coefficient of La(Ⅲ) in the membrane and the thickness of diffusion layer between feed and membrane phases were obtained as 3.20×10-7 m2/s and 3.22×10-5 m, respectively. The calculated results were in good agreement with experimental results.

Diterpenoid alkaloids from a Tibetan medicinal plant Aconitum richardsonianum var. pseudosessiliflorum and their cytotoxic activity

The chemical constituents from Aconitum richardsonianum var.pseudosessiliflorum were investigated.The roots of this plant were extracted three times with 90% EtOH at the room temperature.The ethanol extracts were combined and concentrated under reduced pressure to yield residue,which was suspended in water and successively partitioned with chloroform.The chloroform extraction was isolated and purified by silica gel and Sephadex LH-20 column chromatography.Six compounds were isolated and elucidated as delelatine（1）,isodelpheline（2）,3-acetylaconitine（3）,isoatisine（4）,nordhagenine A（5）and yunaconitine（6）.Compounds 1-5 were obtained from Aconitum Brunneum for the first time.Compound（1）showed significant cytotoxic activities（IC50=4.36 μM）against the human tumor cell line P388.

Recent advances on rare earths in solid lithium ion conductors

Solid lithium-ion-conducting material is the key component in the fabrication of next-gene ration all solid state lithium ion batteries(LIBs)which would exhibit superior safety and performance compared with the currently widely used ones that resort to essentially inflammable and volatile organic solvents.To date,great efforts have been made in developing solid conductors with high lithium ion conductivity,such as polymers and inorganic materials.Rare earths play a very important role in this area and have attracted extensive interest since the recent decades for their unique properties in the realm of solidstate inorganic lithium-ion-conducting electrolyte materials.In this introduction,we focus on the role of rare earths in solid conductors for lithium ion,especially in a few most studied systems such as perovskites,garnets,silicates,borohydride and the recently reported halides in which rare earths act as a key framing component.Besides,the effect of rare earths as dopants is also discussed in some recently studied systems.Valence,coordination,and size are the most important factors that influence the crystal structure and property of these lithium ion conductors.The aim of this review is to highlight the great potentials of these unique elements of rare earths,and to help improve the performance of existing materials and explore new applications in the development of new LIBs with high performances.