Here we report the functionalization of a zeolite-like metal organic framework of rho topology with two cationic dye molecules, methylene blue (MB+) and a ruthenium(II) tris bipyridine complex ([Ru(bpy)3]2+). The spectroscopic properties of both molecules are influenced strongly by host-guest interactions within the cavities of the rho-ZMOF system. These strong interactions can be seen by shifts in the absorption and emission spectra of the functionalized ZMOF with respect to the dyes in solution. The absorption and emission spectrum of MB-ZMOF are red shifted with respect to MB+ in aqueous solution, while the emission of [Ru(bpy)3]-ZMOF is blue shifted with respect to [Ru(bpy)3]2+ in aqueous solution. In the MB-[Ru(bpy)3]-ZMOF, the presence of MB+ quenches the emission of [Ru(bpy)3]2+ through an efficient energy transfer mechanism. Analyzing the lifetime of the [Ru(bpy)3]-ZMOF reveals that there are four unique environments within the system and a strong quenching of [Ru(bpy)3]2+ by rho-ZMOF network.

Functionalization of the rho-ZMOF framework with fluorescent probes

249th National Meeting (2015)

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