Abstract
The spectral properties of p-aminoacetophenone (PAAP) were evaluated in several matrices. At room temperature, PAAP exhibits both fluorescence and phosphorescence when adsorbed on Whatman No. 1 filter paper. However, the fluorescence to phosphorescence ratio increased upon lowering the substrate temperature to −65°C. The interactions between PAAP and the paper substrate appears to be similar to the hydrogen bonding interactions occurring with PAAP in ethanolic glass. The strong interactions between PAAP and the paper substrate also resulted in (much) longer phosphorescence lifetimes for PAAP adsorbed on paper either at 25°C or at −65°C than for PAAP in non-polar glasses at 77 K. The strong phosphorescence of PAAP at 25°C does not require a heavy atom perturber, base or a salt like sodium acetate. Most likely, the charge transfer transition in PAAP plays a significant role in room temperature phosphorimetry of PAAP on filter paper.
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