scholarly journals Triplet Excited States and Singlet Oxygen Production by Analogs of Red Wine Pyranoanthocyanins

2018 ◽  
Vol 95 (1) ◽  
pp. 176-182 ◽  
Author(s):  
Gustavo Thalmer M. Silva ◽  
Suma S. Thomas ◽  
Cassio Pacheco Silva ◽  
Jan C. Schlothauer ◽  
Mauricio S. Baptista ◽  
...  
Keyword(s):  
Singlet Oxygen ◽  
Excited States ◽  
Red Wine ◽  
Oxygen Production ◽  
Triplet Excited States

scholarly journals Heavy-Atom Free spiro Organoboron Complexes As Triplet Excited States Photosensitizers for Singlet Oxygen Activation

2021 ◽  
Vol 86 (18) ◽  
pp. 12714-12722
Author(s):  
Paulina H. Marek-Urban ◽  
Mateusz Urban ◽  
Magdalena Wiklińska ◽  
Klaudia Paplińska ◽  
Krzysztof Woźniak ◽  
...  
Keyword(s):  
Singlet Oxygen ◽  
Excited States ◽  
Heavy Atom ◽  
Oxygen Activation ◽  
Triplet Excited States

Synthesis and photophysical properties of covalent conjugates of aqua platinum(II) and octacarboxy-substituted zinc phthalocyanine

2012 ◽  
Vol 16 (11) ◽  
pp. 1217-1224 ◽  
Author(s):  
Roman A. Bulgakov ◽  
Nina A. Kuznetsova ◽  
Olga V. Dolotova ◽  
Ludmila I. Solovieva ◽  
John Mack ◽  
...  
Keyword(s):  
Singlet Oxygen ◽  
Excited States ◽  
Photophysical Properties ◽  
Zinc Phthalocyanine ◽  
Limited Effect ◽  
Oxygen Formation ◽  
Dual Action ◽  
Photochemical Properties ◽  
Triplet Excited States ◽  
Covalent Conjugates

New covalent conjugates of aqua platinum(II) and octacarboxy-substituted zinc phthalocyanine, bearing one, two, three and four aqua platinum moieties on the periphery of the Pc ligand have been synthesized and characterized. The effect of the stepwise introduction of the aqua platinums on the photophysical and photochemical properties of these compounds has been investigated in dimethylsulfoxide solution. It has been found that aqua platinum moieties have only a limited effect on the dynamics of the singlet and triplet excited states, on the ability to sensitize singlet oxygen formation and on the photostability. Each conjugate has a high singlet oxygen quantum yield (ΦΔ 0.51–0.62) and thus retains potential for use as a dual action anticancer drugs by acting as a sensitizer for PDT in addition to the likely chemotherapeutic effects of the Pt(II) complexes.

Quantifying photo-production of triplet excited states and singlet oxygen from effluent organic matter

2019 ◽  
Vol 156 ◽  
pp. 23-33 ◽  
Author(s):  
Meghan O'Connor ◽  
Samantha R. Helal ◽  
Douglas E. Latch ◽  
William A. Arnold
Keyword(s):  
Organic Matter ◽  
Singlet Oxygen ◽  
Excited States ◽  
Effluent Organic Matter ◽  
Triplet Excited States ◽  
Photo Production

scholarly journals Generation of Triplet Excited States via Photoinduced Electron Transfer in meso-anthra-BODIPY: Fluorogenic Response toward Singlet Oxygen in Solution and in Vitro

2017 ◽  
Vol 139 (18) ◽  
pp. 6282-6285 ◽  
Author(s):  
Mikhail A. Filatov ◽  
Safakath Karuthedath ◽  
Pavel M. Polestshuk ◽  
Huguette Savoie ◽  
Keith J. Flanagan ◽  
...  
Keyword(s):  
Electron Transfer ◽  
Singlet Oxygen ◽  
Excited States ◽  
Photoinduced Electron Transfer ◽  
Triplet Excited States

Photostabilization of endogenous porphyrins: excited state quenching by fused ring cyanoacrylates

2014 ◽  
Vol 13 (8) ◽  
pp. 1180-1184 ◽  
Author(s):  
Steffen Jockusch ◽  
Craig Bonda ◽  
Shengkui Hu
Keyword(s):  
Excited State ◽  
Singlet Oxygen ◽  
Excited States ◽  
Protoporphyrin Ix ◽  
Oxygen Generation ◽  
Singlet Oxygen Generation ◽  
Fused Ring ◽  
Triplet Excited States ◽  
Excited State Quenching

Tricyclic cyanoacrylates quench singlet and triplet excited states of the endogenous chromophore protoporphyrin IX to prevent harmful singlet oxygen generation.

scholarly journals Functionalization of Photosensitized Silica Nanoparticles for Advanced Photodynamic Therapy of Cancer

2021 ◽  
Vol 22 (12) ◽  
pp. 6618
Author(s):  
Ruth Prieto-Montero ◽  
Alejandro Prieto-Castañeda ◽  
Alberto Katsumiti ◽  
Miren P. Cajaraville ◽  
Antonia R. Agarrabeitia ◽  
...  
Keyword(s):  
Singlet Oxygen ◽  
Silica Nanoparticles ◽  
Mesoporous Silica Nanoparticles ◽  
Absorption Capacity ◽  
Oxygen Production ◽  
Photodynamic Therapy Of Cancer ◽  
Custom Made ◽  
Fluorescence Efficiency ◽  
Covalently Linked

BODIPY dyes have recently attracted attention as potential photosensitizers. In this work, commercial and novel photosensitizers (PSs) based on BODIPY chromophores (haloBODIPYs and orthogonal dimers strategically designed with intense bands in the blue, green or red region of the visible spectra and high singlet oxygen production) were covalently linked to mesoporous silica nanoparticles (MSNs) further functionalized with PEG and folic acid (FA). MSNs approximately 50 nm in size with different functional groups were synthesized to allow multiple alternatives of PS-PEG-FA decoration of their external surface. Different combinations varying the type of PS (commercial Rose Bengal, Thionine and Chlorine e6 or custom-made BODIPY-based), the linkage design, and the length of PEG are detailed. All the nanosystems were physicochemically characterized (morphology, diameter, size distribution and PS loaded amount) and photophysically studied (absorption capacity, fluorescence efficiency, and singlet oxygen production) in suspension. For the most promising PS-PEG-FA silica nanoplatforms, the biocompatibility in dark conditions and the phototoxicity under suitable irradiation wavelengths (blue, green, or red) at regulated light doses (10–15 J/cm2) were compared with PSs free in solution in HeLa cells in vitro.

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