EVIDENCE FOR STACKING OF CATIONIC PORPHYRIN IN AQUEOUS SOLUTION

Abstract

Abstract The dilute aqueous solutions (2×10−7–1×10−5 mol dm−3) of 5,10,15,20-tetrakis(4-N-methylpyridyl)porphine (TMPyP) showed a broad fluorescence emission band, which was split into two bands with increasing temperature and/or further dilution. These results as well as the effects of additives on the fluorescence spectrum indicated that TMPyP molecules stack in water.