3D Co(II, III) mixed-valence metal-organic framework affording field-induced slow magnetic relaxation  

作　　者：Sheng Zhang Xiangyu Liu Bin Liu Zhengqiang Xia Weitao Wang Qi Yang Hongshan Ke Qing Wei Gang Xie Sanping Chen Shengli Gao 

机构地区：[1]Key Laboratory of Synthetic and Natural Functional Molecule Chemistry of Ministry of Education [2]College of Chemistry and Materials Science, Northwest University [3]School of Chemistry and Chemical Engineering, Ningxia University [4]College of Chemistry and Chemical Engineering, Shaanxi University of Science & Technology

出　　处：《Science China Chemistry》2015年第6期1032-1038,共7页中国科学（化学英文版）

基　　金：supported by the National Natural Science Foundation of China(21373162,21127004,21173168,21203149,21463020);the Natural Science Foundation of Shaanxi Province(11JS110,FF10091,SJ08B09)

摘　　要：A 3D mixed-valence Co（Ⅲ）-Co（Ⅱ） compound [Co9（bta）10（Hbta）2（H2O）10]n·[22（H2O）]n （1） （H2bta=N,N-bis（1H-tetrazole-5- yl）-amine） was hydrothermally synthesized by reaction of Co（NO3）2·6H2O with H2bta·H2O. Compound 1 consists of three kinds of distorted-octahedral [CoⅡ（N4O2）] paramagnetic nodes which are separated by [CoⅢ（bta）2（Hbta）]2-/[CoⅢ（bta）3]3- dia- magnetic linkers to generate a 3D porous metal-organic framework （MOF） with alternative …Co（Ⅲ）…Co（II）… array and channels incorporating water molecules. Under an applied magnetic field of 4000 Oe, compound 1 exhibits slow relaxation of magnetization at low temperatures, giving AE/kB=30.O0 K and ι0=2.0×10^-8 s.A 3D mixed-valence Co(III)–Co(II) compound [Co9(bta)10(Hbta)2(H2O)10]n·[22(H2O)]n(1)(H2bta=N,N-bis(1H-tetrazole-5-yl)-amine) was hydrothermally synthesized by reaction of Co(NO3)2·6H2O with H2bta·H2O. Compound 1 consists of three kinds of distorted-octahedral [CoII(N4O2)] paramagnetic nodes which are separated by [CoIII(bta)2(Hbta)]2-/[CoIII(bta)3]3-diamagnetic linkers to generate a 3D porous metal-organic framework(MOF) with alternative ···Co(III)···Co(II)··· array and channels incorporating water molecules. Under an applied magnetic field of 4000 Oe, compound 1 exhibits slow relaxation of magnetization at low temperatures, giving △E/kB=30.00 K and τ0=2.0×10-8 s.

关 键 词：Co（Ⅱ  Ⅲ） mixed-valence metal-organic framework  slow magnetic relaxation 

分 类 号：O627.8[理学—有机化学]