Redox processes are studied in the molecular pores of a crystalline UMCM-1 metal organic framework (MOF) material. Methylene blue is employed as an absorbed redox active dye component. From the change in coloration during dye adsorption, it can be concluded that an essentially irreversible adsorption process with high pore loading of the resulting MOF structure occurs. The adsorbed methylene blue remains redox active in the MOF pores and there is no evidence of losses during extended redox cycling. Due to the size of the pores, the reactivity of the pore-bound methylene blue is closely related to that expected for methylene blue in aqueous solution. A study of the effect of solution pH on the voltammetric responses reveals an interesting gradual change in electrical pore conductivity form poorly conducting under acidic conditions to highly conducting under alkaline conditions and this is interpreted in terms of charge transport via single-electron hopping conduction in pores.

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