Projekte

Solvation dynamics: improved reproduction of the time-dependent Stokes shift with polarizable empirical force field chromophore models

Autor(en)
Esther Heid, Stella Schmode, Payal Chatterjee, Alexander D. MacKerell, Christian Schroeder
Abstrakt

The inclusion of explicit polarization in molecular dynamics simulation has gained increasing interest during the last several years. An understudied area is the role of polarizability in computer simulations of solvation dynamics around chromophores, particularly for the large solutes used in experimental studies. In this work, we present fully polarizable ground and excited state force fields for the common fluorophores N-methyl-6-oxyquinolium betaine and Coumarin 153. While analyzing the solvation responses in water, methanol, and the highly viscous ionic liquid 1-ethyl-3-methylimidazolium trifluoromethanesulfonate we found that the inclusion of solute polarizability considerably increases the agreement of the obtained Stokes shift relaxation functions with experimental data. Solute polarizability slows down the inertial solvation response in the femtosecond time regime and enables the chromophore to adapt its dipole moment to the environment. Furthermore, the developed chromophore force field reproduces the solute dipole moments in both the electronic ground and excited state in environments ranging from gas phase to highly polar media correctly. Based on these studies it is anticipated that polarizable models of chromophores will lead to an improved understanding of the relationship of their environment to their spectroscopic properties.

Organisation(en)
Institut für Computergestützte Biologische Chemie
Externe Organisation(en)
University of Maryland, Baltimore
Journal
Physical Chemistry Chemical Physics
Band
21
Seiten
17703-17710
Anzahl der Seiten
8
ISSN
1463-9076
DOI
https://doi.org/10.1039/c9cp03000j
Publikationsdatum
08-2019
Peer-reviewed
Ja
ÖFOS 2012
Physikalische Chemie, Computersimulation
Schlagwörter
Link zum Portal
https://ucris.univie.ac.at/portal/de/publications/solvation-dynamics-improved-reproduction-of-the-timedependent-stokes-shift-with-polarizable-empirical-force-field-chromophore-models(bf0f1bb7-d5e7-4e5d-a51c-2b06e7f6c825).html

Publikationen

Solvation dynamics: improved reproduction of the time-dependent Stokes shift with polarizable empirical force field chromophore models

Autor(en)
Esther Heid, Stella Schmode, Payal Chatterjee, Alexander D. MacKerell, Christian Schroeder
Abstrakt

The inclusion of explicit polarization in molecular dynamics simulation has gained increasing interest during the last several years. An understudied area is the role of polarizability in computer simulations of solvation dynamics around chromophores, particularly for the large solutes used in experimental studies. In this work, we present fully polarizable ground and excited state force fields for the common fluorophores N-methyl-6-oxyquinolium betaine and Coumarin 153. While analyzing the solvation responses in water, methanol, and the highly viscous ionic liquid 1-ethyl-3-methylimidazolium trifluoromethanesulfonate we found that the inclusion of solute polarizability considerably increases the agreement of the obtained Stokes shift relaxation functions with experimental data. Solute polarizability slows down the inertial solvation response in the femtosecond time regime and enables the chromophore to adapt its dipole moment to the environment. Furthermore, the developed chromophore force field reproduces the solute dipole moments in both the electronic ground and excited state in environments ranging from gas phase to highly polar media correctly. Based on these studies it is anticipated that polarizable models of chromophores will lead to an improved understanding of the relationship of their environment to their spectroscopic properties.

Organisation(en)
Institut für Computergestützte Biologische Chemie
Externe Organisation(en)
University of Maryland, Baltimore
Journal
Physical Chemistry Chemical Physics
Band
21
Seiten
17703-17710
Anzahl der Seiten
8
ISSN
1463-9076
DOI
https://doi.org/10.1039/c9cp03000j
Publikationsdatum
08-2019
Peer-reviewed
Ja
ÖFOS 2012
Physikalische Chemie, Computersimulation
Schlagwörter
Link zum Portal
https://ucris.univie.ac.at/portal/de/publications/solvation-dynamics-improved-reproduction-of-the-timedependent-stokes-shift-with-polarizable-empirical-force-field-chromophore-models(bf0f1bb7-d5e7-4e5d-a51c-2b06e7f6c825).html

Vortraege

Solvation dynamics: improved reproduction of the time-dependent Stokes shift with polarizable empirical force field chromophore models

Autor(en)
Esther Heid, Stella Schmode, Payal Chatterjee, Alexander D. MacKerell, Christian Schroeder
Abstrakt

The inclusion of explicit polarization in molecular dynamics simulation has gained increasing interest during the last several years. An understudied area is the role of polarizability in computer simulations of solvation dynamics around chromophores, particularly for the large solutes used in experimental studies. In this work, we present fully polarizable ground and excited state force fields for the common fluorophores N-methyl-6-oxyquinolium betaine and Coumarin 153. While analyzing the solvation responses in water, methanol, and the highly viscous ionic liquid 1-ethyl-3-methylimidazolium trifluoromethanesulfonate we found that the inclusion of solute polarizability considerably increases the agreement of the obtained Stokes shift relaxation functions with experimental data. Solute polarizability slows down the inertial solvation response in the femtosecond time regime and enables the chromophore to adapt its dipole moment to the environment. Furthermore, the developed chromophore force field reproduces the solute dipole moments in both the electronic ground and excited state in environments ranging from gas phase to highly polar media correctly. Based on these studies it is anticipated that polarizable models of chromophores will lead to an improved understanding of the relationship of their environment to their spectroscopic properties.

Organisation(en)
Institut für Computergestützte Biologische Chemie
Externe Organisation(en)
University of Maryland, Baltimore
Journal
Physical Chemistry Chemical Physics
Band
21
Seiten
17703-17710
Anzahl der Seiten
8
ISSN
1463-9076
DOI
https://doi.org/10.1039/c9cp03000j
Publikationsdatum
08-2019
Peer-reviewed
Ja
ÖFOS 2012
Physikalische Chemie, Computersimulation
Schlagwörter
Link zum Portal
https://ucris.univie.ac.at/portal/de/publications/solvation-dynamics-improved-reproduction-of-the-timedependent-stokes-shift-with-polarizable-empirical-force-field-chromophore-models(bf0f1bb7-d5e7-4e5d-a51c-2b06e7f6c825).html