Intramolecular energy transfer dynamics in differently linked zinc porphyrin–dithiaporphyrin dyads

RSC Advances ◽  
2015 ◽  
Vol 5 (104) ◽  
pp. 85296-85304 ◽  
Author(s):  
R. Ghosh ◽  
M. Yedukondalu ◽  
M. Ravikanth ◽  
D. K. Palit
Keyword(s):  
Energy Transfer ◽  
Transient Absorption ◽  
Intramolecular Energy Transfer ◽  
Spectroscopic Techniques ◽  
Time Resolved ◽  
Zinc Porphyrin ◽  
Molecular Dyads

Intramolecular energy transfer dynamics in two molecular dyads, in which zinc porphyrin and dithiaporphyrin units were linked covalently, were studied by ultrafast time-resolved transient absorption and fluorescence spectroscopic techniques.

Synthesis and Photophysical Properties of a Conformationally Flexible Mixed Porphyrin Star-Pentamer

2009 ◽  
Vol 62 (7) ◽  
pp. 692 ◽  
Author(s):  
Toby D. M. Bell ◽  
Sheshanath V. Bhosale ◽  
Kenneth P. Ghiggino ◽  
Steven J. Langford ◽  
Clint P. Woodward
Keyword(s):  
Energy Transfer ◽  
Photophysical Properties ◽  
Fluorescence Decay ◽  
High Yield ◽  
Free Base ◽  
Time Resolved ◽  
Zinc Porphyrin ◽  
Relative Contribution ◽  
Synthetic Strategy ◽  
Decay Times

The synthesis of a porphyrin star-pentamer bearing a free-base porphyrin core and four zinc(ii) metalloporphyrins, which are tethered by a conformationally flexible linker about the central porphyrin’s antipody, is described. The synthetic strategy is highlighted by the use of olefin cross metathesis to link the five chromophores together in a directed fashion in high yield. Photoexcitation into the Soret absorption band of the zinc porphyrin chromophores at 425 nm leads to a substantial enhancement of central free-base porphyrin fluorescence, indicating energy transfer from the photoexcited zinc porphyrin (outer periphery) to central free-base porphyrin. Time-resolved fluorescence decay profiles required three exponential decay components for satisfactory fitting. These are attributed to emission from the central free-base porphyrin and to two different rates of energy transfer from the zinc porphyrins to the free-base porphyrin. The faster of these decay components equates to an energy-transfer rate constant of 3.7 × 109 s–1 and an efficiency of 83%, whereas the other is essentially unquenched with respect to reported values for zinc porphyrin fluorescence decay times. The relative contribution of these two components to the initial fluorescence decay is ~3:2, similar to the 5:4 ratio of cis and trans geometric isomers present in the pentamer.

scholarly journals Photoinduced electron transfer processes of single-wall carbon nanotube (SWCNT)–based hybrids

Nanophotonics ◽  
2020 ◽  
Vol 9 (16) ◽  
pp. 4689-4701
Author(s):  
Lili Du ◽  
Wenjuan Xiong ◽  
Wai Kin Chan ◽  
David Lee Phillips
Keyword(s):  
Electron Transfer ◽  
Transient Absorption ◽  
Electronic Materials ◽  
Photophysical Properties ◽  
Functional Materials ◽  
Single Wall Carbon Nanotubes ◽  
Spectroscopic Techniques ◽  
Time Resolved ◽  
Single Wall Carbon ◽  
Electron Transfer Processes

AbstractIn this review, noncovalent functionalization of single-wall carbon nanotubes (SWCNTs) is briefly reviewed. The functional materials summarized here include metalloporphyrin derivatives, biomolecules and conjugated polymers. Notably, time-resolved spectroscopic techniques such as time-resolved fluorescence and transient absorption were employed to directly investigate the electron transfer and recombination processes between the functionalities and the SWCNTs. In addition, Raman spectroscopy is also useful to identify the interaction and the electron transfer direction between both the functionalities and the SWCNTs. An improved understanding of the mechanisms of these SWCNT-based nanohybrids in terms of their structural and photophysical properties can provide more insights into the design of new electronic materials.

scholarly journals Investigations of the Energy Transfer in the Phycobilisome Antenna of Arthrospira platensis Using Femtosecond Spectroscopy

2020 ◽  
Vol 10 (11) ◽  
pp. 4045
Author(s):  
Alexandra Fălămaș ◽  
Sebastian A. Porav ◽  
Valer Tosa
Keyword(s):  
Energy Transfer ◽  
Transient Absorption ◽  
Single Photon ◽  
Global Analysis ◽  
Photon Counting ◽  
Excitation Energy Transfer ◽  
Arthrospira Platensis ◽  
Absorption Data ◽  
Time Resolved ◽  
Photocurrent Amplification

Understanding the energy transfer in phycobilisomes extracted from cyanobacteria can be used for building biomimetic hybrid systems for optimized solar energy collection and photocurrent amplification. In this paper, we applied time-resolved absorption and fluorescence spectroscopy to investigate the ultrafast dynamics in a hemidiscoidal phycobilisome obtained from Arthrospira platensis. We obtained the steady-state and time-resolved optical properties and identified the possible pathways of the excitation energy transfer in the phycobilisome and its components, phycocyanin and allophycocyanin. The transient absorption data were studied using global analysis and revealed the existence of ultrafast kinetics down to 850 fs in the phycobilisome. The fluorescence lifetimes in the nanosecond time-scale assigned to the final emitters in each sample were obtained from the time-correlated single photon counting fluorescence experiments.

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.

Controlling electron and energy transfer paths by selective excitation in a zinc porphyrin–BODIPY–C60 multi-modular triad

Nanoscale ◽  
2017 ◽  
Vol 9 (45) ◽  
pp. 18054-18065 ◽  
Author(s):  
Christopher O. Obondi ◽  
Gary N. Lim ◽  
Priscilla Martinez ◽  
Varghese Swamy ◽  
Francis D'Souza
Keyword(s):  
Energy Transfer ◽  
Selective Excitation ◽  
Spectroscopic Techniques ◽  
Zinc Porphyrin ◽  
Covalently Linked

The significance of selective excitation in triggering the photochemical events in a newly synthesized covalently linked supramolecular triad is demonstrated using ultrafast spectroscopic techniques.

scholarly journals Picosecond Absorption Spectroscopy of Energy Transfer Processes in Polymethine Dyes

1990 ◽  
Vol 10 (3) ◽  
pp. 139-145 ◽  
Author(s):  
K. -H. Feller ◽  
R. Gadonas ◽  
V. Krasauskas
Keyword(s):  
Energy Transfer ◽  
Transient Absorption ◽  
Iron Complex ◽  
Polymethine Dyes ◽  
Acceptor Molecule ◽  
Time Resolved ◽  
Transfer Processes ◽  
Energy Donor ◽  
First Time ◽  
Polymethine Dye

Results are presented of time-resolved absorption investigations of energy transfer processes between a polymethine dye and an iron complex dye (dye E). For the first time the acceptor molecule transient absorption depletion generated by energy transfer from an excited donor was observed. The decay time of the acceptor deactivation (≈ 140 Ps) in the presence of the energy donor agrees very well with the S1-state lifetime of the energy donor.

scholarly journals Interaction of light with a non-covalent zinc porphyrin–graphene oxide nanohybrid

2020 ◽  
Vol 22 (24) ◽  
pp. 13456-13466
Author(s):  
Ewelina Gacka ◽  
Gotard Burdzinski ◽  
Bronisław Marciniak ◽  
Adam Kubas ◽  
Anna Lewandowska-Andralojc
Keyword(s):  
Electron Transfer ◽  
Graphene Oxide ◽  
Absorption Spectroscopy ◽  
Fast Electron ◽  
Transient Absorption ◽  
Singlet State ◽  
Transient Absorption Spectroscopy ◽  
Time Resolved ◽  
Zinc Porphyrin

Fast electron transfer from the photoexcited ZnTPPH singlet state to GO sheets was detected by ultrafast time-resolved transient absorption spectroscopy.

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