Sequential, Ultrafast Energy Transfer and Electron Transfer in a Fused Zinc Phthalocyanine-free-base Porphyrin-C60 Supramolecular Triad

ChemPhysChem ◽  
2018 ◽  
Vol 20 (1) ◽  
pp. 163-172 ◽  
Author(s):  
Sairaman Seetharaman ◽  
Jorge Follana-Berná ◽  
Luis Martín-Gomis ◽  
Georgios Charalambidis ◽  
Adelais Trapali ◽  
...  
Keyword(s):  
Electron Transfer ◽  
Energy Transfer ◽  
Zinc Phthalocyanine ◽  
Free Base

Supramolecular complex of a fused zinc phthalocyanine–zinc porphyrin dyad assembled by two imidazole-C60units: ultrafast photoevents

2018 ◽  
Vol 20 (11) ◽  
pp. 7798-7807 ◽  
Author(s):  
Jorge Follana-Berná ◽  
Sairaman Seetharaman ◽  
Luis Martín-Gomis ◽  
Georgios Charalambidis ◽  
Adelais Trapali ◽  
...  
Keyword(s):  
Electron Transfer ◽  
Energy Transfer ◽  
Charge Separation ◽  
Supramolecular Complex ◽  
Zinc Phthalocyanine ◽  
Zinc Porphyrin

A ZnP–ZnPc, fused ZnP–ZnPc dyad is shown to undergo ultrafast energy transfer followed by electron transfer to coordinated fullerene resulting in charge separation.

Ultrafast Singlet−Singlet Energy Transfer in Self-Assembled via Metal−Ligand Axial Coordination of Free-Base Porphyrin−Zinc Phthalocyanine and Free-Base Porphyrin−Zinc Naphthalocyanine Dyads

2010 ◽  
Vol 114 (1) ◽  
pp. 268-277 ◽  
Author(s):  
Eranda Maligaspe ◽  
Tatu Kumpulainen ◽  
Helge Lemmetyinen ◽  
Nikolai V. Tkachenko ◽  
Navaneetha K. Subbaiyan ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Zinc Phthalocyanine ◽  
Free Base ◽  
Axial Coordination ◽  
Self Assembled ◽  
Metal Ligand

scholarly journals Electron Transfer-Supported Photodynamic Therapy

2020 ◽  
Author(s):  
Kazutaka Hirakawa
Keyword(s):  
Electron Transfer ◽  
Photodynamic Therapy ◽  
Energy Transfer ◽  
Precancerous Lesions ◽  
Hypoxic Condition ◽  
Protein Damage ◽  
Free Base ◽  
Invasive Treatment ◽  
Porphyrin Derivatives ◽  
Mediated Oxidation

Photodynamic therapy (PDT) is a less-invasive treatment of cancer and precancerous lesions. Porphyrin derivatives have been used and studied as the photosensitizers for PDT. In general, the biomacromolecules oxidation by singlet oxygen, which is produced through energy transfer from the photoexcited photosensitizers to oxygen molecules, is an important mechanism of PDT. However, the traditional PDT effect may be restricted, because tumors are in a hypoxic condition and in certain cases, PDT enhances hypoxia via vascular damage. To solve this problem, the electron transfer-mediated oxidation of biomolecules has been proposed as the PDT mechanism. Specifically, porphyrin phosphorus(V) complexes demonstrate relatively strong photooxidative activity in protein damage through electron transfer. Furthermore, other photosensitizers, e.g., cationic free-base porphyrins, can oxidize biomolecules through electron transfer. The electron transfer-supported PDT may play the important roles in hypoxia cancer therapy. Furthermore, the electron transfer-supported mechanism may contribute to antimicrobial PDT. In this chapter, recent topics about the biomolecules photooxidation by electron transfer-supported mechanism are reviewed.

Modulation of Energy Transfer into Sequential Electron Transfer upon Axial Coordination of Tetrathiafulvalene in an Aluminum(III) Porphyrin–Free-Base Porphyrin Dyad

2015 ◽  
Vol 54 (17) ◽  
pp. 8482-8494 ◽  
Author(s):  
Prashanth K. Poddutoori ◽  
Lucas P. Bregles ◽  
Gary N. Lim ◽  
Patricia Boland ◽  
Russ G. Kerr ◽  
...  
Keyword(s):  
Electron Transfer ◽  
Energy Transfer ◽  
Free Base ◽  
Axial Coordination ◽  
Sequential Electron

Photoinduced Electron Transfer and Excitation Energy Transfer in Directly Linked Zinc Porphyrin/Zinc Phthalocyanine Composite

2006 ◽  
Vol 110 (47) ◽  
pp. 12734-12742 ◽  
Author(s):  
Fuyuki Ito ◽  
Yukihide Ishibashi ◽  
Sazzadur Rahman Khan ◽  
Hiroshi Miyasaka ◽  
Kazuya Kameyama ◽  
...  
Keyword(s):  
Electron Transfer ◽  
Energy Transfer ◽  
Excitation Energy ◽  
Photoinduced Electron Transfer ◽  
Excitation Energy Transfer ◽  
Zinc Phthalocyanine ◽  
Zinc Porphyrin

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.

Sign in / Sign up

Export Citation Format

Share Document