Synthesis and properties of diads based on tetra-aryl porphyrins and ruthenium bis-terpyridine-type complexes

2001 ◽  
Vol 05 (07) ◽  
pp. 600-607 ◽  
Author(s):  
ISABELLE M. DIXON ◽  
JEAN-PAUL COLLIN
Keyword(s):  
Energy Transfer ◽  
Excited State ◽  
Fluorescence Quenching ◽  
Emission Spectra ◽  
Spectroscopic Properties ◽  
Free Base ◽  
Strong Electron ◽  
Transfer Processes ◽  
C Complex

Four diads consisting of a free-base or zinc aryl-porphyrin associated with two ruthenium(II) bis(terdentate) complexes (non-cyclometallated Ru ( N 6) or cylometallated Ru ( N 5 C )) have been synthesized. The strong electron-withdrawing properties of the Ru ( N 6) as compared to the Ru ( N 5 C ) complex have been illustrated by their electrochemical and spectroscopic properties. Emission spectra of the diads and the reference compounds have shown that very efficient fluorescence quenching occurs, probably by energy transfer processes from the porphyrin to the 3MLCT excited state of the ruthenium unit.

Excited-State Energy Transfer Processes in Phenylene- and Biphenylene-Linked and Directly-Linked Zinc(II) and Free-Base Hybrid Diporphyrins

2001 ◽  
Vol 105 (17) ◽  
pp. 4200-4210 ◽  
Author(s):  
Hyun Sun Cho ◽  
Dae Hong Jeong ◽  
Min-Chul Yoon ◽  
Yong Hee Kim ◽  
Yong-Rok Kim ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Excited State ◽  
State Energy ◽  
Free Base ◽  
Excited State Energy ◽  
Transfer Processes

scholarly journals Процессы передачи энергии в эвлитите Sr-=SUB=-3-=/SUB=-Y(PO-=SUB=-4-=/SUB=-)-=SUB=-3-=/SUB=-, по отдельности и одновременно легированном ионами Tb-=SUP=-3+-=/SUP=- и Tm-=SUP=-3+-=/SUP=-

2022 ◽  
Vol 130 (1) ◽  
pp. 99
Author(s):  
Xiaowu Hu ◽  
Fabio Piccinelli ◽  
Marco Bettinelli
Keyword(s):  
Energy Transfer ◽  
Optical Spectroscopy ◽  
Emission Spectra ◽  
Cross Relaxation ◽  
Transfer Efficiency ◽  
Relaxation Processes ◽  
Donor Concentration ◽  
Acceptor Concentration ◽  
Transfer Processes ◽  
Double Phosphate

In this work the optical spectroscopy and the energy transfer processes involving the Tb3+and Tm3+ ions, have been studied in eulytite double phosphate hosts of the type Sr3Y(PO4)3 doped with various amounts of the two Ln ions. It has been found that several energy transfer and cross-relaxation processes are active in this class of materials, upon excitation in the 5D4 level of Tb, and in the 1G4 one of Tm. In particular, a Tb→Tm transfer of excitation has been found to quench strongly the 5D4 level of Tb. This process occurs with a transfer efficiency increasing from 0.08 to 0.62, for a donor concentration of 2 mol%, and an acceptor concentration increasing from 2 to 15 mol%. The emission spectra are strongly affected by the presence of Tb⟷Tm energy transfer, and Tm→Tm cross relaxation processes.

scholarly journals Construction of Vibronic Diabatic Hamiltonian for Excited-State Electron and Energy Transfer Processes

2017 ◽  
Vol 121 (50) ◽  
pp. 9567-9578 ◽  
Author(s):  
Yu Xie ◽  
Shengshi Jiang ◽  
Jie Zheng ◽  
Zhenggang Lan
Keyword(s):  
Energy Transfer ◽  
Excited State ◽  
Transfer Processes ◽  
State Electron

Polypeptides with pendant porphyrins of defined sequence of chromophores: towards artificial photosynthetic systems

2008 ◽  
Vol 12 (12) ◽  
pp. 1232-1241 ◽  
Author(s):  
Farid Aziat ◽  
Régis Rein ◽  
Jorge Peón ◽  
Ernesto Rivera ◽  
Nathalie Solladié
Keyword(s):  
Energy Transfer ◽  
Excited State ◽  
Amino Acid ◽  
Fluorescence Spectroscopy ◽  
Photophysical Properties ◽  
Free Base ◽  
Time Resolved Fluorescence ◽  
Time Resolved ◽  
Absorption And Fluorescence Spectroscopy ◽  
Artificial Photosynthetic

In this paper we now report our ongoing progress in the preparation of artificial photosynthetic systems through the preparation of light harvesting multi-porphyrins. A tetramer, constituted of a central dipeptide functionalized by two free-base porphyrins and surrounded by one amino-acid bearing a pendant Zn ( II ) porphyrin on each side, has been chosen. The optical and photophysical properties of this tetramer have been studied by absorption and fluorescence spectroscopy. In addition, the energy transfer phenomenon has been studied and monitored by femtosecond time-resolved fluorescence. Our results indicate that the excited state dynamics redounding in the excitation being localized in the inner free-base porphyrins takes place in the time scale of approximately 1 ps.

scholarly journals Tetranucleotides as a scaffold for diporphyrin arrays

2006 ◽  
Vol 78 (11) ◽  
pp. 2003-2014 ◽  
Author(s):  
Imenne Bouamaied ◽  
Leslie-Anne Fendt ◽  
Markus Wiesner ◽  
Daniel Häussinger ◽  
Nicolas Amiot ◽  
...  
Keyword(s):  
Excited State ◽  
Emission Spectra ◽  
Building Blocks ◽  
Spectroscopic Properties ◽  
H Nmr ◽  
Base Form ◽  
Tetraphenyl Porphyrin ◽  
Cotton Effects ◽  
Band Absorption ◽  
The Individual

The incorporation of porphyrin-substituted nucleosides into tetranucleotides using phosphoramidite chemistry on solid support is reported. Both diphenyl and tetraphenyl porphyrin nucleosides were used as building blocks. This method allows the synthesis of chiral homo- and heteroporphyrinic arrays, where the composition and thus the physical properties of the array can be modulated simply by reprogramming the DNA synthesizer. The porphyrin arrays are initially isolated in the free-base form. Remetallation to give the zinc-porphyrins can be achieved using standard procedures in solution. The UV-vis spectra of the arrays are reproducible by a superposition of the absorbance spectra of the individual porphyrins, indicating an undisturbed electronic ground state of the porphyrins in the arrays. The same is true for the steady-state emission spectra of the homoporphyrinic arrays, which are not influenced by the presence of the nucleotide strand. In the mixed porphyrin arrays, large differences in the excited-state properties compared to an equimolar mixture of the building blocks are observed by means that the emission of the diphenyl porphyrin moiety is quenched to a large extent, and the overall emission is dominated by the tetraphenyl porphyrin. The covalent connection of the porphyrins via the DNA-derived backbone therefore substantially alters the excited-state and energy-transfer properties of mixed porphyrin systems. The circular dichroism (CD) spectra show induced negative cotton effects in the region of the porphyrin B-band absorption, which is due to the attachment of the chromophores to the chiral oligonucleotide backbone. Addition of a complementary tetra-adenosine did not alter any of the spectroscopic properties, neither in chloroform nor in acetonitrile solutions. Therefore, it can be concluded that no duplex is formed, which is corroborated by 1H NMR spectroscopy.

Study of Excited State Energy Transfer Processes.

1983 ◽  
Author(s):  
J. R. Barthel ◽  
R. E. Duff ◽  
W. J. Proffer
Keyword(s):  
Energy Transfer ◽  
Excited State ◽  
State Energy ◽  
Excited State Energy ◽  
Transfer Processes
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