Exploring the decay mechanisms of isoindigo from indolin-2-one-based derivatives: molecular isomerism vs. aromatic rigidity
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View abstract on PubMed
Summary
This summary is machine-generated.We investigated the excited state decay of isoindigo (ISO) derivatives, EBI and DBND. Flexible EBI decays rapidly via radiationless pathways, while rigid DBND deactivates radiatively.
Area Of Science
- Photochemistry
- Organic Chemistry
- Spectroscopy
Background
- Excited state decay pathways of indigo (IND) and its isomers (indirubin, INR; isoindigo, ISO) are key research areas.
- Mechanisms like excited state proton transfer (ESPT) and rotational isomerization are of significant interest.
Purpose Of The Study
- To synthesize and characterize new isoindigo (ISO) derivatives to understand their excited state decay mechanisms.
- To compare the photophysical properties of flexible (EBI) and rigid (DBND) isoindigo structures.
Main Methods
- Synthesis of two novel indolin-2-one derivatives: 3,3'-(ethane-1,2-diylidene)bis(indolin-2-one) (EBI) and 6,12-dihydrodibenzo[c,h][2,6]naphthyridine-5,11-dione (DBND).
- Identification and purification of three EBI geometrical isomers (E,E'-EBI, Z,E'-EBI, Z,Z'-EBI) using HPLC.
- Excited state property analysis via steady-state absorption/emission spectroscopy and femtosecond transient absorption spectroscopy (fs-TA).
- Quantum chemical calculations to support spectral interpretations.
Main Results
- Flexible EBI, irrespective of its isomeric form, exhibits efficient radiationless decay pathways in the excited state.
- Rigid, polyaromatic DBND primarily deactivates through radiative pathways.
- Distinct spectral features were observed and explained using computational methods.
Conclusions
- Molecular flexibility significantly influences excited state decay mechanisms in isoindigo derivatives.
- Rigidity in polyaromatic systems like DBND promotes radiative decay, contrasting with flexible systems like EBI.
- The study provides deeper insights into the photophysics of isoindigo isomers.
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