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Strategies for Computer-Aided Discovery of Novel Open-Shell Polymers
Omri D Abarbanel1, Julisa Rozon1, Geoffrey R Hutchison1,2
1Department of Chemistry, University of Pittsburgh, 219 Parkman Avenue, Pittsburgh, Pennsylvania 15260, United States.
The Journal of Physical Chemistry Letters
|February 28, 2022
Summary
Researchers explored organic π-conjugated polymers with triplet ground states. A small singlet HOMO-LUMO gap effectively predicts triplet ground states, simplifying the discovery of new materials.
Area of Science:
- Materials Science
- Organic Chemistry
- Computational Chemistry
Background:
- Organic π-conjugated polymers with triplet ground states exhibit unique electronic properties due to unpaired electrons.
- These polymers are typically synthesized from alternating electron-donating and electron-accepting monomers, leading to a lowered HOMO-LUMO gap and a triplet ground state.
Purpose of the Study:
- To investigate the design principles for creating ground-state triplet conjugated polymers.
- To identify reliable predictors for the existence of triplet ground states in these materials.
Main Methods:
- Utilizing density functional theory (DFT) calculations.
- Analyzing the relationship between singlet HOMO-LUMO gap and triplet ground state formation.
- Comparing the predictive power of HOMO-LUMO gap versus pro-quinoidal bonding character.
Main Results:
- A small HOMO-LUMO gap in the singlet state is identified as the most effective predictor for a triplet ground state.
- This finding offers an improvement over previous reliance on pro-quinoidal bonding character.
Conclusions:
- The study provides crucial design rules for stable triplet ground-state conjugated polymers.
- This research can significantly reduce computational costs and candidate screening for new material synthesis.
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