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Issue 17, 2015
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The electronic, optical and magnetic consequences of delocalization in multifunctional donor–acceptor organic polymers

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Abstract

Two organic polymers containing alternating electron donating triarylamine and electron accepting thiazolo[5,4-d]thiazole (TzTz) moieties have been synthesized and their redox states investigated. When donor and acceptor units are proximal (polymer 1), electron density is delocalized, leading to a small electrical and optical band gap; these are larger with the inclusion of an adjoining alkynyl-phenyl bridge (polymer 2), where electron density is more localized due to the rotation of the monomer units. As a result, 1 and 2 display different optical and fluorescence properties in their neutral states. Upon chemical and electrochemical redox reactions, radicals form in both 1 and 2, yielding magnetic materials that display temperature-independent paramagnetism, attributable to delocalization of radical spins along the polymeric backbones. The ability to convert between diamagnetic and paramagnetic states upon chemical oxidation and/or reduction allows for the materials to display switchable magnetism and fluorescence, imparting multifunctionality to these solid-state purely organic materials.

Graphical abstract: The electronic, optical and magnetic consequences of delocalization in multifunctional donor–acceptor organic polymers

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Publication details

The article was received on 07 Jan 2015, accepted on 27 Mar 2015 and first published on 27 Mar 2015


Article type: Paper
DOI: 10.1039/C5CP00081E
Citation: Phys. Chem. Chem. Phys., 2015,17, 11252-11259
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    The electronic, optical and magnetic consequences of delocalization in multifunctional donor–acceptor organic polymers

    F. J. Rizzuto, C. Hua, B. Chan, T. B. Faust, A. Rawal, C. F. Leong, J. M. Hook, C. J. Kepert and D. M. D'Alessandro, Phys. Chem. Chem. Phys., 2015, 17, 11252
    DOI: 10.1039/C5CP00081E

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