We report the spectroscopic changes of tetraphenylporphyrin carbon nanotube
composites in a variety of chlorinated solvents such as chloroform, dichloroethane and
dichlorobenzene as a result of sonication. Detailed data analysis suggests that protonation
of the porphyrin core nitrogen atoms occurs as a result of sonodegradation of the solvent
molecules. Extreme care must be taken when working with carbon nanotube composite
solutions in chlorinated solvents, as sonication is always employed to disperse the
nanotubes. When working with molecules that are capable of acting as a base someamount of protonation is inevitable and this may dramatically change the
physicochemical properties of the composite materials.
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Chemistry (Scholarly Publications)
Werner Blau,
Silvia Giordani