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Intermolecular exciton-exciton annihilation in phospholipid vesicles doped with [Ru(bpy)(2)dppz](2+)

De la Cadena, Alejandro; Pascher, Torbjörn LU ; Davydova, Dar'ya; Akimov, Denis; Herrmann, Felix; Presselt, Martin; Waechtler, Maria and Dietzek, Benjamin (2016) In Chemical Physics Letters 644. p.56-61
Abstract
The ultrafast photophysics of [Ru(bpy)(2)dppz](2+) (dppz = dipyrido[3,2-a:2',3'-c]-phenazine) embedded into the walls of phospholipid vesicles has been studied by femtosecond time-resolved pump-probe spectroscopy. While [Ru(bpy)(2)dppz](2+) has been studied intensively with respect to its intramolecular charge transfer processes, which are associated with the well known light-switch effect, this study focuses on intermolecular energy transfer processes taking place upon dense packing of the complexes into a phospholipid membrane composed of dipalmitoyl-t-a-phosphatidylglycerol, which can be thought of as a simplistic model of a cellular membrane. The data indicate additional quenching of excited [Ru(bpy)(2)dppz](2+) upon increasing the... (More)
The ultrafast photophysics of [Ru(bpy)(2)dppz](2+) (dppz = dipyrido[3,2-a:2',3'-c]-phenazine) embedded into the walls of phospholipid vesicles has been studied by femtosecond time-resolved pump-probe spectroscopy. While [Ru(bpy)(2)dppz](2+) has been studied intensively with respect to its intramolecular charge transfer processes, which are associated with the well known light-switch effect, this study focuses on intermolecular energy transfer processes taking place upon dense packing of the complexes into a phospholipid membrane composed of dipalmitoyl-t-a-phosphatidylglycerol, which can be thought of as a simplistic model of a cellular membrane. The data indicate additional quenching of excited [Ru(bpy)(2)dppz](2+) upon increasing the pump-pulse intensity. Hence, the observed photophysics, which is assigned to the presence of intermolecular exciton-exciton annihilation at high pump-intensities, might be related to the ultrafast photophysics of [Ru(bpy)(2)dppz](2+) when used as a chromophore to stain cells, an effect that may be taken into account during the employment of novel cellular markers based on Ru polypyridine complexes. (C) 2015 Elsevier B.V. All rights reserved. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Chemical Physics Letters
volume
644
pages
56 - 61
publisher
Elsevier
external identifiers
  • wos:000368264500047
  • scopus:84950249634
ISSN
0009-2614
DOI
10.1016/j.cplett.2015.11.024
language
English
LU publication?
yes
id
12f49e8c-732d-48c2-812a-ca4baf55177b (old id 8739198)
date added to LUP
2016-02-23 10:39:28
date last changed
2017-10-29 04:03:07
@article{12f49e8c-732d-48c2-812a-ca4baf55177b,
  abstract     = {The ultrafast photophysics of [Ru(bpy)(2)dppz](2+) (dppz = dipyrido[3,2-a:2',3'-c]-phenazine) embedded into the walls of phospholipid vesicles has been studied by femtosecond time-resolved pump-probe spectroscopy. While [Ru(bpy)(2)dppz](2+) has been studied intensively with respect to its intramolecular charge transfer processes, which are associated with the well known light-switch effect, this study focuses on intermolecular energy transfer processes taking place upon dense packing of the complexes into a phospholipid membrane composed of dipalmitoyl-t-a-phosphatidylglycerol, which can be thought of as a simplistic model of a cellular membrane. The data indicate additional quenching of excited [Ru(bpy)(2)dppz](2+) upon increasing the pump-pulse intensity. Hence, the observed photophysics, which is assigned to the presence of intermolecular exciton-exciton annihilation at high pump-intensities, might be related to the ultrafast photophysics of [Ru(bpy)(2)dppz](2+) when used as a chromophore to stain cells, an effect that may be taken into account during the employment of novel cellular markers based on Ru polypyridine complexes. (C) 2015 Elsevier B.V. All rights reserved.},
  author       = {De la Cadena, Alejandro and Pascher, Torbjörn and Davydova, Dar'ya and Akimov, Denis and Herrmann, Felix and Presselt, Martin and Waechtler, Maria and Dietzek, Benjamin},
  issn         = {0009-2614},
  language     = {eng},
  pages        = {56--61},
  publisher    = {Elsevier},
  series       = {Chemical Physics Letters},
  title        = {Intermolecular exciton-exciton annihilation in phospholipid vesicles doped with [Ru(bpy)(2)dppz](2+)},
  url          = {http://dx.doi.org/10.1016/j.cplett.2015.11.024},
  volume       = {644},
  year         = {2016},
}