Intramolecular Energy Transfer in Molecular Dyads Comprising Free-base Porphyrin and Ruthenium(II) Bis(2,2‘:6‘,2‘ ‘-terpyridine) Termini

2004 ◽  
Vol 108 (42) ◽  
pp. 9026-9036 ◽  
Author(s):  
Andrew C. Benniston ◽  
Glen M. Chapman ◽  
Anthony Harriman ◽  
Maryam Mehrabi
Keyword(s):  
Energy Transfer ◽  
Intramolecular Energy Transfer ◽  
Free Base ◽  
Molecular Dyads

Intramolecular Energy Transfer in a Covalently Linked Copper(II) Porphyrin−Free Base Porphyrin Dimer:  Novel Spin Polarization in the Energy Acceptor

1999 ◽  
Vol 103 (34) ◽  
pp. 6704-6714 ◽  
Author(s):  
Motoko Asano-Someda ◽  
Art van der Est ◽  
Uwe Krüger ◽  
Dietmar Stehlik ◽  
Youkoh Kaizu ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Spin Polarization ◽  
Intramolecular Energy Transfer ◽  
Free Base ◽  
Covalently Linked ◽  
Porphyrin Dimer ◽  
Energy Acceptor

Intramolecular Energy Transfer in Pyrene–Bodipy Molecular Dyads and Triads

2005 ◽  
Vol 11 (24) ◽  
pp. 7366-7378 ◽  
Author(s):  
Raymond Ziessel ◽  
Christine Goze ◽  
Gilles Ulrich ◽  
Michèle Césario ◽  
Pascal Retailleau ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Intramolecular Energy Transfer ◽  
Molecular Dyads

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.

Delocalized Excitation or Intramolecular Energy Transfer in Pyrene Core Dendrimers

2021 ◽  
pp. 7717-7725
Author(s):  
Dayujia Huo ◽  
Minjie Li ◽  
Zujin Zhao ◽  
Xian Wang ◽  
Andong Xia ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Intramolecular Energy Transfer

scholarly journals Ultrafast Electron/Energy Transfer and Intersystem Crossing Mechanisms in BODIPY-Porphyrin Compounds

Processes ◽  
2021 ◽  
Vol 9 (2) ◽  
pp. 312
Author(s):  
Yusuf Tutel ◽  
Gökhan Sevinç ◽  
Betül Küçüköz ◽  
Elif Akhuseyin Yildiz ◽  
Ahmet Karatay ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Fluorescence Spectra ◽  
Visible Region ◽  
Energy Transfer Mechanism ◽  
Free Base ◽  
Pump Probe ◽  
Harvesting Efficiency ◽  
Probe Spectroscopy ◽  
Absorption Features ◽  
Transfer Mechanisms

Meso-substituted borondipyrromethene (BODIPY)-porphyrin compounds that include free base porphyrin with two different numbers of BODIPY groups (BDP-TTP and 3BDP-TTP) were designed and synthesized to analyze intramolecular energy transfer mechanisms of meso-substituted BODIPY-porphyrin dyads and the effect of the different numbers of BODIPY groups connected to free-base porphyrin on the energy transfer mechanism. Absorption spectra of BODIPY-porphyrin conjugates showed wide absorption features in the visible region, and that is highly valuable to increase light-harvesting efficiency. Fluorescence spectra of the studied compounds proved that BODIPY emission intensity decreased upon the photoexcitation of the BODIPY core, due to the energy transfer from BODIPY unit to porphyrin. In addition, ultrafast pump-probe spectroscopy measurements indicated that the energy transfer of the 3BDP-TTP compound (about 3 ps) is faster than the BDP-TTP compound (about 22 ps). Since the BODIPY core directly binds to the porphyrin unit, rapid energy transfer was seen for both compounds. Thus, the energy transfer rate increased with an increasing number of BODIPY moiety connected to free-base porphyrin.

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.

Identification of intramolecular energy transfer pathways in a reactive triatomic system

1988 ◽  
Vol 89 (5) ◽  
pp. 2948-2957 ◽  
Author(s):  
R. Scott Smith ◽  
Randall B. Shirts
Keyword(s):  
Energy Transfer ◽  
Intramolecular Energy Transfer
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