Selective photooxidation of sulfides mediated by singlet oxygen using visible-light-responsive coordination polymers

2018 ◽  
Vol 54 (92) ◽  
pp. 13002-13005 ◽  
Author(s):  
Xiao Liang ◽  
Zhifen Guo ◽  
Hongxia Wei ◽  
Xin Liu ◽  
Hui Lv ◽  
...  
Keyword(s):  
Coordination Polymer ◽  
Visible Light ◽  
Singlet Oxygen ◽  
Coordination Polymers ◽  
Oxygen Species ◽  
Singlet Oxygen Species

A novel visible-light-responsive coordination polymer for highly selective photooxidation of sulfides to produce sulfoxides through singlet oxygen species.

Degradation of natural toxins by phthalocyanines–example of cyanobacterial toxin, microcystin

2010 ◽  
Vol 62 (2) ◽  
pp. 273-278 ◽  
Author(s):  
Daniel Jančula ◽  
Lucie Bláhová ◽  
Marie Karásková ◽  
Blahoslav Maršálek
Keyword(s):  
Reactive Oxygen Species ◽  
Hydrogen Peroxide ◽  
Visible Light ◽  
Singlet Oxygen ◽  
Oxygen Species ◽  
Cyanobacterial Toxin ◽  
Natural Toxins ◽  
Peptide Toxins ◽  
Near Future ◽  
Absorption Characteristics

Phthalocyanines (Pcs) are promising photosensitizers for use in various branches of science and industry. In the presence of visible light and diatomic oxygen, phthalocyanines can react to produce singlet oxygen, a member of reactive oxygen species able to damage different molecules and tissues. The aim of this study was to investigate the ability of phthalocyanines to degrade natural toxins in the presence of visible light. As the representative of hardly degradable toxins, a group of cyanobacterial peptide toxins—microcystin-LR—was chosen for this study. According to our results, phthalocyanines are able to degrade 61,5% of microcystins within a 48-hour incubation (38% of microcystins was degraded after 24 h and 24% after 12 h of incubation). Although other oxidants like hydrogen peroxide or ozone are able to degrade microcystins within several hours, we assume that by optimizing the spectrum emitted by light source and by changing the absorption characteristics of Pcs, microcystins degradation by phthalocyanines could be more effective in the near future.

Facile construction of an Ag0-doped Ag(I)-based coordination polymer via self-photoreduction strategy for enhanced visible light driven photocatalysis

CrystEngComm ◽  
2021 ◽  
Author(s):  
Wei Jiang ◽  
Mengying Lv ◽  
Baihui Gao ◽  
Bo Liu ◽  
Guosong Yan ◽  
...  
Keyword(s):  
Coordination Polymer ◽  
Visible Light ◽  
Coordination Polymers ◽  
Regular Structures ◽  
Uniformly Separated ◽  
Visible Light Driven

Owing to the uniformly separated metal sites and regular structures, Ag(I)-based coordination polymers (CPs) have been considered as promising platforms for plasmonic photocatalysts. Herein, a novel Ag(I)-CP [Ag2(NO2-bdc)(4,4’-bpy)2]·2CH3CN·2.5H2O (JLNU-90, NO2-bdc...

Synthesis of pH-Responsive Glycopolymer with End Group Zinc(II) Phthalocyanines as Potential Photosensitizer

2020 ◽  
Vol 996 ◽  
pp. 82-87
Author(s):  
Shu Guo Dong ◽  
Gui Hua Cui ◽  
Qian Duan
Keyword(s):  
Photodynamic Therapy ◽  
Singlet Oxygen ◽  
Raft Polymerization ◽  
Photophysical Properties ◽  
Water Soluble ◽  
Quantum Yields ◽  
Oxygen Species ◽  
Ph Responsive ◽  
Reversible Addition ◽  
Singlet Oxygen Species

A novel end-functionalized glycopolymer poly (3-O-methacryloyl-D-glucofuranose) -b-poly (2-Diethylaminoethyl Methacrylate) (PMAGlc-b-PDEA-ZnTAPc) with zinc (II) teraamaninophthalocyanine was synthesized. First, a pH-responsive copolymer PMAIpG-b-PDEA was synthesized via reversible addition-fragmentation chain transfer (RAFT) polymerization. Then PMAIpG-b-PDEA reacted with ZnTAPc and deprotected to form a water-soluble and pH-responsive photosensitizer. The structure of the PMAGlc-b-PDEA-ZnTAPc was characterized by 1H NMR and GPC. The photophysical properties were evaluated by UV-Vis and fluorescence spectra. The PMAGlc-b-PDEA-ZnTAPc can generate singlet oxygen species with good singlet oxygen quantum yields (Φ△=0.38), which is believed to be the major cytotoxic reactive oxygen species (ROS) for photodynamic therapy. The ZnPc functionalized glycopolymer will be used as a potential photosensitizer in the fields of photodynamic therapy.

First Evidence of Singlet Oxygen Species Mechanism in Silicate Clay for Antimicrobial Behavior

2013 ◽  
Vol 1569 ◽  
pp. 67-72
Author(s):  
Jiun-Chiou Wei ◽  
Yi-Ting Wang ◽  
Jiang-Jen Lin
Keyword(s):  
Singlet Oxygen ◽  
Methicillin Resistance ◽  
Antimicrobial Property ◽  
Multilayered Structure ◽  
Chemical Mechanism ◽  
Oxygen Species ◽  
Property A ◽  
E Coli ◽  
Resistant Species ◽  
Singlet Oxygen Species

ABSTRACTThin silicate nanoplatelets, derived from the exfoliation of natural Sodium montmorillonite (Na+-MMT) clays, show an unexpected antimicrobial property. A physical trapping mechanism has been proposed because the clay nanoplatelets can indiscriminately inhibit the growth of a broad spectrum of bacteria, including drug-resistant species such as methicillin-resistance S. aureus (MRSA) and silver ion-resistant E. coli. The ability to generate singlet oxygen species was first observed for the clay platelets that showed a high-aspect-ratio geometric shape and the presence of surface ionic charges. By comparison, the pristine clay with a multilayered structure failed to generate any singlet oxygen species. The ability to emit singlet oxygen species provides direct evidence for the antimicrobial ability of clay through a non-chemical mechanism, which opens the potential for medical use.

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