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.

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.

Fluorescence resonance energy transfer monitoring of pH-responsive doxorubicin release from carbon dots/aptamer functionalized magnetic mesoporous silica

Nanomedicine ◽  
2021 ◽  
Author(s):  
Abolghasem Abbasi Kajani ◽  
Masoud Ayatollahi Mehrgardi
Keyword(s):  
Drug Delivery ◽  
Energy Transfer ◽  
Fluorescence Resonance Energy Transfer ◽  
Carbon Dots ◽  
Drug Loading ◽  
Resonance Energy Transfer ◽  
Resonance Energy ◽  
Spectroscopic Techniques ◽  
Ph Responsive ◽  
Fluorescence Resonance

Aim: To develop a novel theranostic nanoplatform for simultaneous fluorescent monitoring and stimuli-triggered drug delivery. Materials & methods: Different microscopic and spectroscopic techniques were used for the characterization of nanocarriers. MCF-7 and human umbilical vein endothelial cell lines were cultured and treated with different doses of doxorubicin-loaded nanocarriers. The cell viability and drug release were studied using MTT assay and fluorescence microscopy. Results: Biocompatible and mono-disperse nanocarriers represent hollow and mesoporous structures with the calculated surface area of 552.83 m2.g-1, high magnetic activity (12.6 emu.g-1), appropriate colloidal stability and high drug loading capacity (up to 61%). Conclusion: Taxane-based carbon dots act as the pH-responsive gatekeepers for the controlled release of doxorubicin into cancer cells and provide a fluorescence resonance energy transfer system for real-time monitoring of drug delivery.

Bis(4′-tert-butylbiphenyl-4-yl)aniline (BBA)-substituted A3B zinc porphyrin as light harvesting material for conversion of light energy to electricity

2020 ◽  
Vol 24 (10) ◽  
pp. 1189-1197
Author(s):  
Naresh Duvva ◽  
Suneel Gangada ◽  
Raghu Chitta ◽  
Lingamallu Giribabu
Keyword(s):  
Solar Cells ◽  
Large Scale ◽  
Light Harvesting ◽  
Low Cost ◽  
Active Material ◽  
Dye Sensitized Solar Cells ◽  
Spectroscopic Techniques ◽  
Solar Panels ◽  
Zinc Porphyrin ◽  
Sensitized Solar Cells

Limited synthetic steps via low-cost starting materials are needed to develop large-scale light-active materials for efficient solar cells. Here, novel bis(4[Formula: see text]-tert-butylbiphenyl-4-yl)aniline (BBA) based A3B zinc porphyrin (GB) is synthesized and applied as a light harvesting/electron injection material in dye-sensitized solar cells. The GB sensitizer was characterized by various spectroscopic techniques and the optimized device shows [Formula: see text] of 10.98 ± 0.37 mA/cm2 and power conversion efficiency (PCE) of 3.34 ± 0.26%. In addition, performance is enhanced up to ∼3.9% by the addition of co-adsorbent 3a,7a-dihydroxy-5b-cholic acid (chenodeoxycholic acid, CDCA) to minimize [Formula: see text]-[Formula: see text] staking of the planar porphyrin macrocycles. These results demonstrate that novel broad-absorbing light-active material (GB) could be used for indoor solar panels.

scholarly journals Exploring the self-assembly and energy transfer of dynamic supramolecular iridium-porphyrin systems

2016 ◽  
Vol 45 (43) ◽  
pp. 17195-17205 ◽  
Author(s):  
Diego Rota Martir ◽  
Gordon J. Hedley ◽  
David B. Cordes ◽  
Alexandra M. Z. Slawin ◽  
Daniel Escudero ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Self Assembly ◽  
The Self ◽  
Zinc Porphyrin

We present the first examples of dynamic supramolecular iridium–zinc porphyrin systems.

Intramolecular excitation energy transfer in diarylurea-linked zinc porphyrin–anthracene dyads

2005 ◽  
Vol 4 (8) ◽  
pp. 641 ◽  
Author(s):  
Masayuki Ezoe ◽  
Toru Minami ◽  
Yutaro Ogawa ◽  
Shigeyuki Yagi ◽  
Hiroyuki Nakazumi ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Excitation Energy ◽  
Excitation Energy Transfer ◽  
Zinc Porphyrin
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