Yes indeed! The absorptive and emissive transitions of molecular oxygen are spin-forbidden!! Forbidden transitions still occur! But with a low probability. This implies that the molar absorption coefficient is very low (for the absorption) and the emission is very long lived. The latter is especially influenced by vibronic coupling to the solvent. See: ua-cam.com/video/gbSQkrs49ss/v-deo.html at ~44 to 46 minutes. The absorptive transitions of pyrene to S1 are also forbidden: ua-cam.com/video/OPRLcTzjc_8/v-deo.html
A very elegant description with Lewis diagrams. Thank you.
Please include that in your next video
Great lecture!
Thank you for your detailed presentation!!
Glad you enjoyed it!
Thank you very much for your explanations!😍
Thank you sir for your explanation. Can you please share the ppt? Thanks in advance
i thought the direct transition from triplet oxygen to singlet oxygen was spin forbidden?
Yes indeed! The absorptive and emissive transitions of molecular oxygen are spin-forbidden!! Forbidden transitions still occur! But with a low probability. This implies that the molar absorption coefficient is very low (for the absorption) and the emission is very long lived. The latter is especially influenced by vibronic coupling to the solvent. See: ua-cam.com/video/gbSQkrs49ss/v-deo.html at ~44 to 46 minutes. The absorptive transitions of pyrene to S1 are also forbidden: ua-cam.com/video/OPRLcTzjc_8/v-deo.html