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A systematic structural study on the intercalation of the radical cation 2-(4- N -methylpyridinium)-4,4,5,5-tetramethyl-4,5-dihydro-1 H -imidazol-1-oxyl-3- N -oxide ( p -MPYNN) into a synthetic fluoromica clay named Somasif ®  ME 100, Na 2 x   Mg 3.0− x   Si 4 O 10 (F   y   OH 1− y   ) 2  ( x  = 0.33,  y  = 0.98), has been carried out. The guest–host interactions in these intercalation compounds have been characterized by X-ray powder diffraction and solid-state NMR of the constituent nuclei ( 23 Na,  19 F,  27 Al and  29 Si) of the Somasif lattice. The intercalation process can be quantitatively monitored using  23 Na MAS-NMR. As a function of radical ion loading, different kinds of stacking arrangements can be realized, which modify the intermolecular interactions between the electron spins of the guest species, as probed by electron spin resonance (EPR) and  1 H solid state nuclear magnetic resonance (NMR). The results are discussed in relation to previous literature data on similar systems.

zeitschrift für physikalische chemie

Inorganic-organic hybrid materials based on the intercalation of radical cations: 2-(4- N -methylpyridinium)-4,4,5,5-tetramethyl-4,5-dihydro-1 H -imidazol-1-oxyl-3- N -oxide in fluoromica clay