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A: Kinetics, Dynamics, Photochemistry, and Excited States
Quenching Effects of Graphene Oxides on the Fluorescence Emission and ROS Generation of Chloroaluminum Phthalocyanine Alan Rocha Baggio, Mayara Simonelly Costa Santos, Fabiane H. Veiga-Souza, Rodrigo Barbosa Nunes, Paulo Eduardo N. Souza, Sônia Nair Báo, Antonio Otavio Toledo Patrocinio, Detlef W. Bahnemann, Luciano P. Silva, Maria José A. Sales, and Leonardo Giordano Paterno J. Phys. Chem. A, Just Accepted Manuscript • DOI: 10.1021/acs.jpca.8b05660 • Publication Date (Web): 03 Aug 2018 Downloaded from http://pubs.acs.org on August 3, 2018
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The Journal of Physical Chemistry
Quenching Effects of Graphene Oxides on the Fluorescence Emission and ROS Generation of Chloroaluminum Phthalocyanine
Alan R. Baggio1*, Mayara S. C. Santos2, Fabiane H. V. Souza2,3, Rodrigo B. Nunes4, Paulo Eduardo N. Souza4, Sônia N. Báo2, Antonio Otavio T. Patrocinio5,6, Detlef W. Bahnemann6,7, Luciano P. Silva8, Maria José A. Sales1, and Leonardo G. Paterno1*
1
Laboratory of Research on Polymers and Nanomaterials, Institute of Chemistry,
University of Brasilia, Brasília DF 70904-970, Brazil 2
Institute of Biology, University of Brasília, Brasilia DF 70919-970, Brazil
3
College of Ceilândia, University of Brasilia, Brasilia DF 72220-275, Brazil
4
Institute of Physics, University of Brasilia, Brasilia DF 70910-900, Brazil
5
Laboratory of Photochemistry and Materials Science, Institute of Chemistry, Federal
University of Uberlandia,Uberlandia, Brazil 6
Institute of Technical Chemistry, Leibniz University Hannover, Hannover, Germany
7
Laboratory of “Photoactive Nanocomposite Materials”, Saint-Petersburg State
University, Saint-Petersburg, Russia 8
Embrapa
Genetic
Resources
and
Biotechnology,
PBI,
Laboratory
of
Nanobiotechnology (LNANO), Brasília, 70770-917, DF, Brazil
*corresponding author:
[email protected] (L.G. Paterno)
1 ACS Paragon Plus Environment
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Abstract The photophysical behavior and reactive oxygen species (ROS) generation by chloroaluminum
phthalocyanine
(AlClPc)
are
evaluated
by
steady
state
absorption/emission, transient emission, and electron paramagnetic resonance spectroscopies in the presence graphene oxide (GO), reduced graphene oxide (RGO), and carboxylated nano graphene oxide (NGO). AlClPc and graphene oxides form a supramolecular structure stabilized by pi-pi interactions, which quantitatively quenches fluorescence emission and suppresses ROS generation. These effects occur even when graphenes are previously functionalized with Pluronic F-127. A small part of quenching is due to an inner filter effect, in which graphene oxides compete with AlClPc for light absorption. Nonetheless, most of (static) quenching arises on the formation of a nonemissive ground state complex between AlClPc and graphene oxides. The efficiency of graphene oxides on the fluorescence quenching and ROS generation suppression follows the order: GO
