Direct intercalation of pyridinium-derivative cations into the α-zirconium phosphate interlayer by a redox reaction and fluorescence behavior of the intercalation compounds

Abstract

Abstract N -Alkylquinolinium (R-Qu + ), -isoquinolinium (R-isoQu + ) and -acridinium (R-Ac + ) (R=Me, Et, Pr n , Bu n ) cations were directly intercalated into the α-zirconium phosphate (α-ZrP) interlayer space by redox reactions of their iodide salts. These pyridinium-derivative cations fluoresce intensively even in the α-ZrP interlayer, the fluorescence band being similar to the band observed in solution. The fluorescence decay curves measured for the intercalation compounds suspended in acetonitrile were reasonably fitted by assuming a double-exponential model. The compounds contain cation components with short fluorescence lifetimes compared with those observed in acetonitrile, which is explained by self-quenching due to high densities of these cations in the interlayer space.