SUPR
Computational Quantum Chemistry Applied to Excited State (Anti)Aromaticity and Photoreactivity
Dnr:

NAISS 2024/22-1111

Type:

NAISS Small Compute

Principal Investigator:

Nathalie Proos Vedin

Affiliation:

Uppsala universitet

Start Date:

2024-08-28

End Date:

2025-09-01

Primary Classification:

10405: Organic Chemistry

Webpage:

Allocation

Abstract

The project centres on the aromaticity concept applied to excited states of organic molecules. Quantum chemical calculations, using DFT/TD-DFT as well as complete active space and coupled cluster methods, will be applied. In the lowest pipi* singlet and triplet excited states, the (anti)aromaticity of a cyclic system is governed by Baird's rule, stating that compounds with 4n pi-electrons become aromatic, whereas 4n+2 species become antiaromatic. Through this project, calculations will be used to investigate the impact of excited state aromaticity and antiaromaticity on the photochemical reactivity of heteroaromatic systems and other aromatic compounds that are more complex than simple annulenes.