A nanoporous molecular magnet with reversible solvent-induced mechanical and magnetic properties

来自 Nature

喜欢 0

阅读量：

143

作者：

D Maspoch，D Ruiz-Molina，K Wurst，N Domingo，M Cavallini，F Biscarini，J Tejada，C Rovira，J Veciana

展开

摘要：

Interest in metal–organic open-framework structures has increased enormously in the past few years because of the potential benefits of using crystal engineering techniques to yield nanoporous materials with predictable structures and interesting properties. Here we report a new efficient methodology for the preparation of metal–organic open-framework magnetic structures based on the use of a persistent organic free radical (PTMTC), functionalized with three carboxylic groups. Using this approach, we create an open-framework structure Cu(PTMTC)(py)(CHCHOH)(HO), which we call MOROF-1, combining very large pores (2.8–3.1 nm) with bulk magnetic ordering. MOROF-1 shows a reversible and highly selective solvent-induced 'shrinking–breathing' process involving large volume changes (25–35%) that strongly influence the magnetic properties of the material. This magnetic sponge-like behaviour could be the first stage of a new route towards magnetic solvent sensors.

展开

关键词：

Experimental/ magnetic susceptibility materials preparation molecular magnetism nanoporous materials/ nanoporous molecular magnet open-framework structures persistent organic free radical carboxylic groups MOROF-1 solvent-induced shrinking-breathing process volume changes magnetic sponge-like behaviour magnetic solvent sensors/ A6146 Structure of solid clusters, nanoparticles, and nanostructured materials A8120 Other methods of preparation of materials A7530C Magnetic moments and susceptibility in magnetically ordered materials A7550K Amorphous and nanostructured magnetic materials