The extraction behavior of N,N-diethyl-N,N-dibenzenyl-urea（DEDBU）and N,N-dimethyl-N,N-dibenzenyl-urea（DMDBU）to uranium（VI）and thorium（IV）from nitric acid solution was studied by using xylene or chloroform as diluent.The effect of aqueous HNO3 concentration,extractant concentration,salting-out agent concentration and aqueous UO2+2/Th4+concentration on extraction distribution ratio of U（VI）and Th（IV）was determined.The results show that the extraction behavior of the extractants DEDBU and DMDBU to U（VI）is similar to that of TBP,the solvation numbers both are two.Under the experimental condition,the extractants DEDBU and DMDBU do not show the extraction behatvior to Th（IV）.This means that the estractants may have potential application to separate U（VI）and Th（IV）.
The compound [H2（teta）]2+·2Cl-·3H2O （teta=meso-5,7,7,12,14,14-hexamethyl-1,4,8,11-tetraazacyclotetradecane）was synthesized and characterized by elementary analysis and the structure was determined by single-crystal X-ray diffraction.The crystal belongs to triclinic,space group Pī with a=7.8364（16）,b=8.3607（13）,c=9.4762（15）?,α=61.900（12）,β=78.970（16）,γ=80.008（16）°,V=535.06（16）?3,Z=1,ρcalc=1.277g/cm3,F（000）=226.The macrocylic tetraamine cation contains two protonated secondary amine N atoms and two secondary amine N atoms.The water molecules are distinguished by their inequality in structure formation.They are involved in different types of intermolecular hydrogen bonding in the crystal lattice.
A new compound（ClO4）2（H2O）0.5（azpy）was synthesized.Its structure was determined by single X-ray diffraction.The crystal belongs to triclinic system,space group P1.The crystallographic data:a=11.813（2）,b=12.574（2）,c=14.580（3）*!,a=84.048（6）,β=77.878（15）,γ=67.902（12）°,V=1961.1（7）*!3,Z=2,F（000）=926,Mr=904.57,Dc=1.532Mg/m3,μ=0.542mm-1,R1=0.0770,and wR2=0.1373.In the ctystal Mn（Ⅱ）ion is coordinated with six nitrogen from three phen ligands to form a distorted octahedron geometry.
