An Unusual(3,11)-Connected Network Constructed by Tri-nuclear Lanthanide Building Units and Mixed Ligands

Under hydrothermal conditions,a new lanthanide coordination polymer,[Er3(oba)4(na)]n(1,oba=4,4?-oxybis(benzoate),na=nicotinic acid)has been synthesized.Compound 1 shows a 3D framework by incorporating tri-nuclear[Er3(COO)6]unit and the mixed ligands of oba2-and na-.It is interesting that decarboxylation occurred in the ortho position and 2,3-pyridinedicarboxylic acid was partially transformed into na under hydrothermal conditions.Compound 1 can be reduced into a(3,11)-connected net and displays weak second-harmonic generation response.Furthermore,the PXRD,TGA and IR spectra were also studied.     

Chem Base:一个包含化学成份的中药资料库

一个用多媒体技术开发的中药资料库ChemBase已经完成,它可用作收集和提取中药信息。ChemBase主要由CMBASE及CHIMED两个程序组成。CMBASE用来储存中药的资料,除了该中药的基本资料外,其他大部分中药资料库都没有的一些资料,例如化学鉴定方法和化学成份等都包含在内。用户还可以随意增减有关中药的记录。CHIMED是一个界面程序,它令ChemBase更简单易用。此外,ChemBase提供了一个可连接到其他有关中药站点的网页,使用户可以通过互联网轻松地找到更多中药的资料。     

Luminescent Lanthanide-titanium-organic Compound Constructed by Tetra-nuclear Ln-Ti Building Units and Diphenylglycolic Acid

(Under solvothermal conditions with the mixed solvents of C₂H₅OH and H₂O,a new heterometallic lanthanide-titanium-organic compound,[TbTi(μ3-O)(L₃)(H₂O)₄]·H₃O(1,H₂L=diphenylglycolic acid),has been synthesized.Compound 1 exhibits a 3D supramolecular framework by incorporating the tetra-nuclear[Tb₂Ti₂(μ3-O)2]unit and L^2-ligand.Compound 1 shows intense green luminescence.Furthermore,the PXRD,TGA and IR spectra were also studied.)