Direct measurement of the dipole moment of a metastable merocyanine by electromechanical interferometry

The permanent dipole moments of an indolinespirobenzopyran and its merocyanine form in a poly(isobutyl methacrylate) host were determined by electromechanical interferometry. This technique allows the determination of the piezoelectric and electrostrictive properties of thin films for which the pola...

Descripción completa

Guardado en:
Detalles Bibliográficos
Publicado: 1997
Acceso en línea:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00092614_v277_n1-3_p118_Levitus
http://hdl.handle.net/20.500.12110/paper_00092614_v277_n1-3_p118_Levitus
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id paper:paper_00092614_v277_n1-3_p118_Levitus
record_format dspace
spelling paper:paper_00092614_v277_n1-3_p118_Levitus2023-06-08T14:33:43Z Direct measurement of the dipole moment of a metastable merocyanine by electromechanical interferometry The permanent dipole moments of an indolinespirobenzopyran and its merocyanine form in a poly(isobutyl methacrylate) host were determined by electromechanical interferometry. This technique allows the determination of the piezoelectric and electrostrictive properties of thin films for which the polarization of the sample can be determined. The sample was exposed to an external electric field and the polarization was measured as a function of time before and after UV irradiation. Results show that the orientation of spiropyran and merocyanine molecules in the direction of the field is fast compared with the time scale of the photoisomer decay kinetics, allowing the determination of dipole moments from polarization values in the limit of thermal equilibrium. The experiments reveal a pronounced increase in the dipole moment upon ring opening with μ0 = 6.4 D for the spirobenzopyran and μ0 = 14.2 D for the merocyanine form. © 1997 Elsevier Science B.V. 1997 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00092614_v277_n1-3_p118_Levitus http://hdl.handle.net/20.500.12110/paper_00092614_v277_n1-3_p118_Levitus
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
description The permanent dipole moments of an indolinespirobenzopyran and its merocyanine form in a poly(isobutyl methacrylate) host were determined by electromechanical interferometry. This technique allows the determination of the piezoelectric and electrostrictive properties of thin films for which the polarization of the sample can be determined. The sample was exposed to an external electric field and the polarization was measured as a function of time before and after UV irradiation. Results show that the orientation of spiropyran and merocyanine molecules in the direction of the field is fast compared with the time scale of the photoisomer decay kinetics, allowing the determination of dipole moments from polarization values in the limit of thermal equilibrium. The experiments reveal a pronounced increase in the dipole moment upon ring opening with μ0 = 6.4 D for the spirobenzopyran and μ0 = 14.2 D for the merocyanine form. © 1997 Elsevier Science B.V.
title Direct measurement of the dipole moment of a metastable merocyanine by electromechanical interferometry
spellingShingle Direct measurement of the dipole moment of a metastable merocyanine by electromechanical interferometry
title_short Direct measurement of the dipole moment of a metastable merocyanine by electromechanical interferometry
title_full Direct measurement of the dipole moment of a metastable merocyanine by electromechanical interferometry
title_fullStr Direct measurement of the dipole moment of a metastable merocyanine by electromechanical interferometry
title_full_unstemmed Direct measurement of the dipole moment of a metastable merocyanine by electromechanical interferometry
title_sort direct measurement of the dipole moment of a metastable merocyanine by electromechanical interferometry
publishDate 1997
url https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00092614_v277_n1-3_p118_Levitus
http://hdl.handle.net/20.500.12110/paper_00092614_v277_n1-3_p118_Levitus
_version_ 1768543591418822656

Ejemplares similares