Two-Photon Absorption Properties of New Fluorene-Based Singlet Oxygen Photosensitizers

2009 ◽  
Vol 113 (11) ◽  
pp. 4706-4711 ◽  
Author(s):  
Kevin D. Belfield ◽  
Mykhailo V. Bondar ◽  
Florencio E. Hernandez ◽  
Artëm E. Masunov ◽  
Ivan A. Mikhailov ◽  
...  
Keyword(s):  
Singlet Oxygen ◽  
Photon Absorption ◽  
Absorption Properties ◽  
Two Photon Absorption ◽  
Two Photon

Synthesis, DNA photocleavage, singlet oxygen photogeneration and two photon absorption properties of ruthenium-phenanthroline porphyrins

2015 ◽  
Vol 19 (09) ◽  
pp. 1046-1052 ◽  
Author(s):  
Ze-Bin Xu ◽  
Fa-Quan Yu ◽  
Fengshou Wu ◽  
Heng Zhang ◽  
Kai Wang ◽  
...  
Keyword(s):  
Singlet Oxygen ◽  
Cross Section ◽  
Therapeutic Agents ◽  
Photon Absorption ◽  
Quantum Yields ◽  
Absorption Properties ◽  
Dna Photocleavage ◽  
Two Photon Absorption ◽  
Two Photon ◽  
Photochemical Properties

Through a new synthetic route, three ruthenium-phenanthroline porphyrins (RPP1, RPP2 and RPP3) were prepared. Their photophysical and photochemical properties, such as DNA photocleavage activity, singlet-oxygen photogeneration and two-photon absorption (2PA) were evaluated. These porphyrins 1–3 had substantial photocleavage activities, with 71%, 74% and 38% observed at 20 μM. The porphyrins with different substituents on phenathroline group had similar singlet oxygen quantum yields, with ΦΔ values at 0.52, 0.47 and 0.41, respectively. The 2PA cross-section (σ(2)) values of RPP 1–3, measured by the Z-scan method, were calculated to be 152, 172 and 135 GM, respectively, which were around 5-fold higher than that of H2TPP . Thus, these porphyrins, with their good photocleavage activities, 1 O 2 quantum yields and high 2PA cross section, suggest great potential as photodynamic therapeutic agents.

Cooperative porphyrin-quadrupolar based triad for combined two-photon induced fluorescence and singlet oxygen generation

2017 ◽  
Vol 21 (02) ◽  
pp. 77-87 ◽  
Author(s):  
Jean-Baptiste Verlhac ◽  
Guillaume Clermont ◽  
Mireille Blanchard-Desce
Keyword(s):  
Singlet Oxygen ◽  
Photon Absorption ◽  
Absorption Properties ◽  
Oxygen Generation ◽  
Two Photon Absorption ◽  
Design And Synthesis ◽  
Two Photon ◽  
Singlet Oxygen Generation ◽  
Potential Applications ◽  
Order Of Magnitude

The design and synthesis of a cooperative multichromophoric triad system which combines the large two-photon absorption properties of fluorene-cored bis-donor quadropolar dyes and the remarkable sensitizing properties of the porphyrin subunit (i.e. high intersystem crossing and ability to produce singlet oxygen by energy transfer to oxygen from its triplet excited state) is described. After irradiation the energy can be transferred from the quadrupolar chromophores to the porphyrin with an estimated 80% efficiency via a FRET process. Moreover both the two-photon absorption properties of the quadrupolar subunits and the sensitizing and fluorescence properties of the porphyrin are retained indicating that deleterious competing processes (such as photo-induced electron transfer) are prevented in such molecular architectures thanks to the implemented design. As a result, the two-photon absorption induced singlet oxygen generation efficiency of the triad in the NIR region is found to be enhanced by an order of magnitude as compared to the porphyin subunit. Potential applications of these porphyrin-based multichromophoric systems for photodynamic therapy based upon two-photon excitation in the NIR region might be possible since it overcomes the low two-photon absorption response of porphyrin while fully retaining their remarkable photosensitizing properties.

Theoretical Investigation on the One- and Two-photon Absorption Properties of Porphyrin-thiophene Chromophores

2009 ◽  
Vol 27 (7) ◽  
pp. 1269-1279 ◽  
Author(s):  
Wenchao LI ◽  
Jikang FENG ◽  
Aimin REN ◽  
Xiangbiao ZHANG ◽  
Chiachung SUN
Keyword(s):  
Theoretical Investigation ◽  
Photon Absorption ◽  
Absorption Properties ◽  
Two Photon Absorption ◽  
Two Photon ◽  
The One

Substituent effects on the aggregation-induced emission and two-photon absorption properties of triphenylamine–dibenzo[a,c]phenazine adducts

2017 ◽  
Vol 1 (7) ◽  
pp. 1396-1405 ◽  
Author(s):  
Ji Yang ◽  
Yuting Gao ◽  
Tao Jiang ◽  
Wen Liu ◽  
Chenchen Liu ◽  
...  
Keyword(s):  
Substituent Effects ◽  
Photon Absorption ◽  
Absorption Properties ◽  
Aggregation Induced Emission ◽  
Two Photon Absorption ◽  
Two Photon ◽  
Combined Features

Non-substituted and alkyl-substituted triphenylamine–dibenzo[a,c]phenazine adducts (Q1–Q3) showed the combined features of ICT plus AEE, while the alkoxy-substituted Q4–Q5 exhibited obvious AIE effects.

Synthesis and Two-Photon Absorption Properties of 9,10-Bis(arylethynyl)anthracene Derivatives

2004 ◽  
Vol 16 (14) ◽  
pp. 2783-2789 ◽  
Author(s):  
Wen Jun Yang ◽  
Chang Ho Kim ◽  
Mi-Yun Jeong ◽  
Seung Kyu Lee ◽  
Ming Jun Piao ◽  
...  
Keyword(s):  
Photon Absorption ◽  
Absorption Properties ◽  
Two Photon Absorption ◽  
Two Photon ◽  
Anthracene Derivatives
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