Abstract
We report the synthesis and optical properties of organic porphyrin nanoparticles with narrow size distribution and good dispersibility. Nanoparticles were produced by a combination of precipitation and sonication, termed the “ultrasonic method”. The resulting [tetrakis(para-chlorophenyl)porphyrin]TClPP nanoparticles were stable in solution without precipitation for at least 30 days. No self aggregation of the constituent porphyrin chromophores was observed. The TClPP nanoparticles exhibited interesting optical properties, particulalrly a large bathochromic shift in the absorption spectra.
Highlights
Many of the unique properties of nanoscaled materials, especially their electronic, photonic and magnetic properties cannot be achieved using the corresponding atomic, molecular, polymeric or macroscopic materials
To fabricate organic nano-architectures composed of porphyrins, it should be recognized that van der Waals intermolecular and hydrogen-bonding interactions as well as the electrostatic attraction are Molecules 2010, 15 responsible for the specific electronic/optical properties that are fundamentally different from those of inorganic metals or semiconductors [3]
We report synthesis of porphyrin nanoparticles via a sonication method
Summary
Many of the unique properties of nanoscaled materials, especially their electronic, photonic and magnetic properties cannot be achieved using the corresponding atomic, molecular, polymeric or macroscopic materials. The formation of nanoscaled colloidal particles of porphyrins can be accomplished by adding water to a solution of a hydrophobic porphyrin in water-miscible organic solvents such as THF, DMSO, DMF, or CH3CN with a few percent of a low molecular weight polyethylene glycol (PEG). This mixed solvent approach is an efficient means to make large quantities of nanoparticle colloids (20–500 nm diameter) of a variety of porphyrins [4,5]
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