Radical cations of end-capped tetrathienoacenes and their p-dimerization controlled by the nature of a-substituents and counterion concentration

Rizalman, N. S., Ferron, C.C., Niu, W., Wallace, A.L., He, M., Balster, R., Lampkin, J., Hernandez, V., Lopez, J.T., Delgado, M.C.R. and Hartl, F. ORCID: https://orcid.org/0000-0002-7013-5360 (2013) Radical cations of end-capped tetrathienoacenes and their p-dimerization controlled by the nature of a-substituents and counterion concentration. RSC Advances, 3 (48). pp. 25644-25647. ISSN 2046-2069 doi: 10.1039/c3ra45899g

Abstract/Summary

Radical cations of a soluble rigid tetrathienoacene are capable of forming stable p-dimer dications at ambient temperature when the short backbone becomes extended with conjugated thiophene-2-yl substituents in the a-positions. On the other hand, simple attachment of methyl groups on the a-carbon of the external thiophen-2-yl rings proved sufficient to inhibit the dimerization. Stable radical cationswere also exclusively formed for tetrathienoacene derivatives end-capped with bulky TIPS and phenyl substituents.