Crystal Engineering of Co(Ⅱ) Metal-organic Frameworks Based on the Hydrolysis Product of Letrozole and Coligands

摘要

The cyanide groups of letrozole (1-[bis(4-cyanophenyl)methyl]-l,2,4-triazole) were hydrolyzed into the carboxylic groups under alkaline conditions.Then the hydrolysis product (1-[bis(4-carboxylphenyl)methyl]-1,2,4-triazole,H2ltzda) reacted with Co(NO3)2·6H2O in the presence of different bipyridl-typed ligands under hydrothermal conditions.As a result,two new Co(Ⅱ) MOFs were obtained,formulated as [Co2(ltzda)2(bpp)2]n (1) and {[Co2(ltzda)2(bpy)].4H2O}n (2) (bpp =1,3-di(4-pyridyl)propane,bpy =4,4'-bipyridine).Two MOFs have been characterized by single-crystal X-ray diffraction,thermogravimetric analysis and magnetic measure.1 displays a 2D metal-organic framework containing wave layers and 2 shows a pillared-layer structure existing in a 2-fold interpenetrated mode.