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ISSN 1998-9539

Aluminum Phthalocyanine on Silica Nanoparticles: Aggregation and Excited States

Anton V. Lobanov,a,b@ Nataliya B. Sultimova,c Petr P. Levin,c Ivan B. Meshkov,d and Mikhail Ya. Melnikove
aN.N. Semenov Institute of Chemical Physics, Russian Academy of Sciences, 119334 Moscow, Russia
bG.V. Plekhanov Russian University of Economics, 117997 Moscow, Russia
cN.M. Emanuel Institute of Biochemical Physics, Russian Academy of Sciences, 119334 Moscow, Russia
dN.S. Enikolopov Institute of Synthetic Polymer Materials, Russian Academy of Sciences, 117393 Moscow, Russia
eM.V. Lomonosov Moscow State University, Department of Chemistry, 119991 Moscow, Russia
@Corresponding author E-mail: avlobanov@mail.ru
Aluminum phthalocyanines (AlClPc) adsorbed on the surface of silica nanoparticles with diameter of 60 nm in aqueous solutions have been found to form H-aggregates, which possess characteristic absorption spectra with bands (having maximum at 640 nm) in a shorter wavelength region with respect to the main Q-band of the monomer (having maximum at 670 nm). For AlClPc on the surface, J-aggregates of two types (long-wavelength bands with maxima at 740 and 770 nm) are also observed. Using nanosecond laser photolysis (with the excitation wavelength of 337 nm) in deoxygenated solutions of AlClPc on the surface, the formation of the triplet excited states of J-aggregates has been detected. Triplet excited states of J-aggregates are characterized by a broad absorption spectrum in the region of 600–800 nm and a lifetime of 360 µs.

 

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