I have an oxindole derived compound. To study its photophysics the compd was dissolved in DCM with varying concentrations but when emission was recorded it was observed that at low concentration there is an emission at around 420 nm, however on increasing concentration a low broad peak at near 600 nm starts to appear. Moreover, in low concentration solution where initially on peak was shown at 420 nm, a newer starts to appear as time passes. What could be the reason possibly. Any answers from experts, if anyone who is reading this are acknowledged.
- Bidyut
I would like to add the there is no change in absorption pattern either with concentration or time.
It sounds like excimer (excited dimer) formation, meaning that the compound is self-associating. The classic example of this is pyrene.
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