As reported in many papers, pure C60 solution exhibit purple color, and when it is mixed with solution of electron donating entity, the color turns brownish gradually with time.
I found that this phenomenon does not occur in CT complex solution using other electron acceptors such as tetracyanoethylene and m-dinitrobenzene.
correct me if I am wrong. Thank you.
I have the agreement with this your result. This according to aggregation.
you are got the same behavior.
thank
regard
A brownish colour is normally an indication of aggregation. You can check this by UV vis spectroscopy. Solid state C60 has a strong intermolecular CT band at ~450nm, and this emerges as aggregates grow.
"Comprehensive Analysis of Intermolecular Charge Transfer Excited States in C60 and C70 Films", S. Kazaoui, N. Minami, Y. Tanabe, H.J. Byrne, A. Eilmes and P. Petelenz, Phys. Rev. B12, 7689 (1998)
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