The geometrical aromaticity HOMA index can be useful for acyclic linear systems. It approaches a horizontal asymptote as the periodic linear system increases in size. For the unsaturated polymers such as polyenes or polythiophenes, the index seems to be a fair measure of the π-electron delocalization and thus to be a good simple tool for the design of conducting polymers.
J. Cz. Dobrowolski and S. Ostrowski, RSC Adv., 2015, 5, 9467 DOI: 10.1039/C4RA15311A
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