Sonochemical preparation and characterization of solid dodecyl perylene diimides/MCM-41

Abstract

Solid state dodecyl perylene diimide (DDPDI) fluorescent materials (DDPDI/MCM-41) with strong fluorescence were successfully prepared by incorporating the DDPDI molecules into the nanopores of MCM-41 in toluene solution with subsequent ultrasonic treatment. The solid materials were characterized by small-angle X-ray diffraction (SAXRD), high-resolution transmission electron microscopy (HRTEM), ultraviolet-visible spectroscopy (DR UV-vis), fluorescence spectroscopy, and elemental analysis. The results indicated that the DDPDI molecules were incorporated into the mesopores of MCM-41 in the monomeric or dimeric state after ultrasonic treatment, and the DDPDI content was 41.0 (mg g⁻¹). In addition, the Stokes shift of the DDPDI in MCM-41 decreased to zero in contrast to that in toluene solution. Emission of DDPDI/MCM-41 composites split into two peaks at 543 nm and 551 nm in water, indicating DDPDI molecules attached at the internal and external surface of the pores of MCM-41. The difference of spectral shift was proportional to the permittivity of the solvent.