Time-resolved photothermal methods: accessing time-resolved thermodynamics of photoinduced processes in chemistry and biologyDedicated to Professor Silvia Braslavsky, to mark her great contribution to photochemistry and photobiology particularly in the field of photothermal methods.

2003 ◽  
Vol 2 (7) ◽  
pp. 699 ◽  
Author(s):  
Thomas Gensch ◽  
Cristiano Viappiani
Keyword(s):  
Great Contribution ◽  
Time Resolved ◽  
Photothermal Methods ◽  
Photoinduced Processes

Intramolecular photoinduced processes of newly synthesized dual zinc porphyrin-fullerene triad with flexible linkers

2006 ◽  
Vol 10 (12) ◽  
pp. 1380-1391 ◽  
Author(s):  
Mohamed E. El-Khouly ◽  
Jun Hasegawa ◽  
Atsuya Momotake ◽  
Mikio Sasaki ◽  
Yasuyuki Araki ◽  
...  
Keyword(s):  
Transient Absorption ◽  
Photophysical Properties ◽  
Ion Pair ◽  
Reaction Centre ◽  
Polar Solvents ◽  
Time Resolved ◽  
Zinc Porphyrin ◽  
Photosynthetic Antenna ◽  
Porphyrin Moiety ◽  
Photoinduced Processes

Zinc porphyrin-fullerene-zinc porphyrin triad, in which two zinc porphyrin ( ZnP ) moieties and a fullerene ( C 60) moiety are linked by flexible bonds and which is intended to be a working model of the photosynthetic antenna-reaction centre, has been newly synthesized. Its photophysical properties have been investigated by both time-resolved emission and transient absorption techniques. Excitation of the zinc porphyrin moiety of the triad induced charge separation, generating the radical ion pair, in which the electron localizes on the C 60 moiety and the hole localizes on the zinc porphyrin moiety. In polar solvents, the charge-separated states decayed with lifetimes of 300-600 ns returning to the ground state. Compared with ZnP - C 60 dyad, ZnP - C 60- ZnP triad showed longer lifetimes for the radical ion pair due to the conformation of the two ZnP moieties. The effects of the coordinating reagents on the zinc atom have been studied, with the expectation of conformational change of the two ZnP moieties with respect to C 60.

Photoinduced Processes in Some Mechanically Interlocked Supramolecules as Studied by Time-Resolved Electron Paramagnetic Resonance

2011 ◽  
Vol 115 (50) ◽  
pp. 24555-24563 ◽  
Author(s):  
Manuela Jakob ◽  
Alexander Berg ◽  
Haim Levanon ◽  
David I. Schuster ◽  
Jackson D. Megiatto
Keyword(s):  
Electron Paramagnetic Resonance ◽  
Paramagnetic Resonance ◽  
Time Resolved ◽  
Electron Paramagnetic ◽  
Photoinduced Processes

Photoinduced processes in chromophore–gold nanoparticle assemblies

2011 ◽  
Vol 83 (4) ◽  
pp. 813-821 ◽  
Author(s):  
Anne Kotiaho ◽  
Riikka Lahtinen ◽  
Helge Lemmetyinen
Keyword(s):  
Electron Donors ◽  
Covalent Attachment ◽  
Core Diameter ◽  
Time Resolved ◽  
Controlled Assembly ◽  
Efficient Energy ◽  
Transfer Processes ◽  
Ability To Act ◽  
Photoinduced Charge ◽  
Photoinduced Processes

Development of nanotechnology requires that the interaction between components of nanoscale devices can be studied and understood better. Photoinduced processes between small (2–5 nm in core diameter) gold nanoparticles (GNPs) and chromophores, including porphyrin, fullerene, and phthalocyanine, were studied. Two methods were selected for controlled assembly of chromophores and gold particles at close distances: thin films and covalent attachment, which yields chromophore-functionalized particles. Time-resolved spectroscopic and photoelectrical measurements carried out further confirmed the known strong effect of GNPs on photoexcited chromophores that leads to fast photoinduced processes. When GNPs are combined with suitable chromophores, the particles can act as electron donors or acceptors. GNPs are efficient energy acceptors, and some indications of their ability to act as energy donors were obtained. The participation of the GNPs in photoinduced charge transfer in addition to energy-transfer processes makes them attractive components for photoactive devices.

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