A straightforward method to quantify the electron-delocalizing ability of π-conjugated molecules

Abstract

Electronic delocalization is essential to the properties of π-conjugated molecules. We introduce the inter-fragment delocalization index (IFDI) as an easy-to-use computational method for quantifying the electronic delocalization in π-conjugated oligomers and molecular wire models. We show that the IFDI is related to the torsion barriers of π-conjugated dimers, and to the single-molecule conductance of several π-conjugated fragments. The IFDI is a useful screening technique for comparing different π-conjugated subunits as components in organic electronics, since it can quantify the influence of substitution position, structure, and (anti)aromaticity on delocalization.

David Bradley

PhD Student (2020-2023)

David received his undergraduate BSc degree from Northumbria University in 2016, before working in industry as an analytical chemist until 2018. He then started a 1-year research project in October 2018 at Durham University under the supervision of Dr James Walton, investigating aromatic transformations catalysed by η6-coordination to ruthenium. David joined the Peeks group in February 2020 and his research will focus on antiaromatic materials and their applications.