1,5-Diphenyl-3-naphthyl-2-pyrazoline nanocrystals with different sizes from
400 to 20 mm were prepared by the reprecipitation method. As the nanocryst
al size decreased, the nanocrystal absorption peak was observed to shift to
high-energy side due to size effect, and in the same period the peak shape
changed from asymmetric to symmetric due to the gradual disappearance of t
he aggregate absorption, (C) 1999 Academic Press.