Electrochromic properties of poly(alkoxy-terthiophenes): an experimental and theoretical investigation |
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Authors: | M J L Santos A F Rubira R M Pontes E A Basso E M Girotto |
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Institution: | (1) Departamento de Química, Universidade Estadual de Maringá, Av. Colombo 5790, 87020900 Maringá, Brazil |
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Abstract: | Much effort has been made to synthesize novel compounds and enhance the optical properties of poly(terthiophenes). The electrochromic
properties of poly(4,4′′-dimetoxy-3′-methyl-2′-5′,2′′-terthiophene) (PDMMT) and poly(4,4′′-dipentoxy-3′-methyl-2′-5′,2′′-terthiophene)
(PDPMT) have been studied focusing on the differences in the alkoxy-group length. Theoretical calculations were employed to
elucidate the structural and thermodynamic stability of the monomers and dimmers. The results showed that in this type of
thiophenes large alkoxy chains assist positive charge dispersion through hyperconjugative effect. Thus, PDPMT is thermodynamically
more stable than PDMMT in the oxidized state, leading to better electrochromic stability and optical memory. |
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Keywords: | Poly(terthiophenes) Electrochromic properties Theoretical calculations |
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