基于尺寸识别和离子交换实现有机染料分离的一例阴离子型MOF

在溶剂热的条件下,利用5-氨基间苯二甲酸(H2aip)配体和硝酸铟[In(NO3)3?5H2O]定向构筑了一例二维结构的阴离子型金属有机框架材料,{(Me2NH2)?[In(aip)2]}?x G(1,G=客体分子).采用X射线单晶衍射、热分析仪(TGA)和X射线粉末衍射(PXRD)等方法对该化合物进行了结构表征.经过活化后样品1-ht几乎不吸附氮气,但却能有效地吸附氢气和二氧化碳.此外,化合物1还可以通过离子交换和尺寸识别的方式来吸附阳离子亚甲基蓝(MB)染料,而很难吸附阴离子甲基橙(MO)染料和分子尺寸更大的阳离子罗丹明B(Rh B)染料,实现水相中MB/MO和MB/Rh B的选择性分离.     

Synthesis, Crystal Structure, Thermal Stability and Luminescent Properties of a New 2D Zinc Complex

A new coordination polymer associated with zinc ion,[Zn(Tda)(bpp)] n (1,H 2 tda=thiophene-2,5-dicarboxylic acid,bpp=1,3-bis(4-pyridyl)propane),was prepared under solvothermal conditions,and characterized by single-crystal X-ray diffraction,elemental analysis and IR spectra.The complex belongs to monoclinic,space group P2 1 /c with a=9.8799(4),b=12.0430(6),c=15.4269(9),β=95.424(5) o,V=1827.33(16) 3,Z=4,D c=1.577 g/cm 3,S=1.074,μ=1.486 mm-1,F(000)=888,M r=433.80,R=0.0359 and wR=0.0968 for 2685 observed reflections (I > 2σ(Ⅰ)).Complex 1 displays an interesting 2D lattice structure.In 1,four coordinated zinc ions were bridged by Tda and bpp ligands to generate a (4,4) two-dimensional layer.The thermogravimetric analysis,powder X-ray diffraction (XRD) and luminescent properties for 1 also have been explored.     

自行精度不等时确定星团成员的一种严格方法

本文提出了一种恒星自行精度不等时用于确定星团成员的方法,从而对Sanders方法作出了重要改进。对疏散星团M11的讨论和分析表明,这一方法不仅在理论上是严格的,在实际应用上也是可行的,它能使星团自行成员的确定得到更为合理的结果。