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Synthesis, characterization and optical properties of a series of copolymers bearing 1-ethynylpyrene and ethynylbenzene units

Published online by Cambridge University Press:  26 November 2020

Pasquale Porcu ,
Andrea García-Rodriguez ,
Juan Carlos Carranza-Cruz ,
Javier Illescas  and
Ernesto Rivera
Pasquale Porcu
Affiliation:
Instituto de Investigaciones en Materiales, Universidad Nacional Autónoma de México, Circuito Exterior Ciudad Universitaria C.P. 04510 México D.F. México.
Andrea García-Rodriguez
Affiliation:
Instituto de Investigaciones en Materiales, Universidad Nacional Autónoma de México, Circuito Exterior Ciudad Universitaria C.P. 04510 México D.F. México.
Juan Carlos Carranza-Cruz
Affiliation:
Tecnológico Nacional de México/Instituto Tecnológico de Toluca, Av. Tecnológico S/N, Col. Agrícola Bellavista, C.P. 52149, Metepec, México.
Javier Illescas*
Affiliation:
Tecnológico Nacional de México/Instituto Tecnológico de Toluca, Av. Tecnológico S/N, Col. Agrícola Bellavista, C.P. 52149, Metepec, México.
Ernesto Rivera*
Affiliation:
Instituto de Investigaciones en Materiales, Universidad Nacional Autónoma de México, Circuito Exterior Ciudad Universitaria C.P. 04510 México D.F. México.
*
*riverage@unam.mx, fillescasm@toluca.tecnm.mx
*riverage@unam.mx, fillescasm@toluca.tecnm.mx
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Abstract

A novel series of copolymers were obtained from the copolymerization of 1-ethynylpyrene (EP) (known as pyrenylacetylene) and ethynylbenzene (EB) (named also phenylacetylene) with WCl6 as catalyst and toluene as solvent, using different monomer molar ratios EP/EB (80:20, 60:40, 50:50; 40:60, 20:80). The optical properties of the obtained copolymers Poly(EP-co-EB) were determined by absorption and fluorescence spectroscopy. Absorption spectra of the copolymers Poly(EP-co-EB) showed that copolymers containing phenylacetylene units possess a lower degree of conjugation than the homopolymer trans-poly(1-ethynylpyrene) (trans-PEP), since they showed a twisted conformation. These results were confirmed by emission spectroscopy showing the formation of excimers for those copolymers containing high pyrene content.

Type
Articles
Information
MRS Advances , Volume 5 , Issue 62: International Materials Research Congress XXIX , 2020 , pp. 3215 - 3225
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Copyright
Copyright © The Author(s), 2020, published on behalf of Materials Research Society by Cambridge University Press

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