Extraordinary dissolution of coordination polymer, La[Fe(CN)6] · 5H2O, in ethylene glycol/water mixed solvent and structural determination of dissolved species

摘要

Heteronuclear coordination polymer, La[Fe(CN)6] · 5H2O, poorly soluble in water and almost insoluble in usual organic solvents due to its sturdy three-dimensional infinite network structure constructed by Fe-CN-La linkages was found to be tremendously dissolved in the mixed solvent of ethylene glycol (EG):water = 7:3 to give a highly viscous solution as a promising fluid precursor for the wide application of La[Fe(CN)6] · 5H2O which has been so far utilized only as a solid precursor of LaFeO3. Structure of single crystals isolated from this viscous solution was determined to elucidate the high solubility of La[Fe(CN)6] · 5H2O.