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Yang S, Liu W, Shentu J, Chen X, Yang Y, Wang K, Qian J, Long L. On-Site Quantitative Visualization of Singlet Oxygen in Crops via an Organic Small Molecule-Based Ratiometric Fluorescent Probe and a Mobile Fluorescence Analysis Device. Anal Chem 2024; 96:9192-9199. [PMID: 38758357 DOI: 10.1021/acs.analchem.4c01131] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/18/2024]
Abstract
Singlet oxygen (1O2) plays imperative roles in a variety of biotic or abiotic stresses in crops. The change of its concentration within a crop is closely related to the crop growth and development. Accordingly, there is an urgent need to develop an efficient analytical method for on-site quantitative detection of 1O2 in crops. Here, we judiciously constructed a novel ratiometric fluorescent probe, SX-2, for the detection of 1O2 in crops. Upon treating with 1O2, probe SX-2 displayed highly selective ratiometric fluorescence response, which is favorable for the quantitative detection of 1O2. Concurrently, the fluorescence solution color of probe SX-2 was varied, obviously from blue to yellow, indicating that the probe is beneficial for on-site detection by the naked eye. Sensing reaction mechanism studies showed that the 2,3-diphenyl imidazole group in SX-2 could function as a new selective recognition group for 1O2. Probe SX-2 was utilized for the detection of photoirradiation-induced 1O2 and endogenous 1O2 in living cells. The changes in the 1O2 level in zebrafish were also tracked by fluorescence imaging. In addition, the production of 1O2 in crop leaves under a light source of different wavelengths was studied. The results demonstrated more 1O2 were produced under a light source of 365 nm. Furthermore, to achieve on-site quantitative detection, a mobile fluorescence analysis device has been made. Probe SX-2 and mobile fluorescence analysis device were capable of on-site quantitative detecting of 1O2 in crops. The method developed herein will be convenient for the on-site quantitative measurement of 1O2 in distinct crops.
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Affiliation(s)
- Sanxiu Yang
- School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang, Jiangsu 212013, PR China
- Key Laboratory of Modern Agricultural Equipment and Technology (Ministry of Education), Jiangsu University, Zhenjiang, Jiangsu 212013, PR China
| | - Weiguo Liu
- School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang, Jiangsu 212013, PR China
- Key Laboratory of Modern Agricultural Equipment and Technology (Ministry of Education), Jiangsu University, Zhenjiang, Jiangsu 212013, PR China
| | - Jiaye Shentu
- School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang, Jiangsu 212013, PR China
- Key Laboratory of Modern Agricultural Equipment and Technology (Ministry of Education), Jiangsu University, Zhenjiang, Jiangsu 212013, PR China
| | - Xiaodong Chen
- School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang, Jiangsu 212013, PR China
- Key Laboratory of Modern Agricultural Equipment and Technology (Ministry of Education), Jiangsu University, Zhenjiang, Jiangsu 212013, PR China
| | - Yunfei Yang
- School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang, Jiangsu 212013, PR China
- Key Laboratory of Modern Agricultural Equipment and Technology (Ministry of Education), Jiangsu University, Zhenjiang, Jiangsu 212013, PR China
| | - Kun Wang
- School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang, Jiangsu 212013, PR China
- Key Laboratory of Modern Agricultural Equipment and Technology (Ministry of Education), Jiangsu University, Zhenjiang, Jiangsu 212013, PR China
| | - Jing Qian
- School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang, Jiangsu 212013, PR China
- Key Laboratory of Modern Agricultural Equipment and Technology (Ministry of Education), Jiangsu University, Zhenjiang, Jiangsu 212013, PR China
| | - Lingliang Long
- School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang, Jiangsu 212013, PR China
- Key Laboratory of Modern Agricultural Equipment and Technology (Ministry of Education), Jiangsu University, Zhenjiang, Jiangsu 212013, PR China
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Ding H, Wang T, Sun Y, Zhang Y, Wei J, Cai R, Guo C, Yuan Y, Yue T. Role and Mechanism of Cold Plasma in Inactivating Alicyclobacillus acidoterrestris in Apple Juice. Foods 2023; 12:foods12071531. [PMID: 37048353 PMCID: PMC10094426 DOI: 10.3390/foods12071531] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2023] [Revised: 03/26/2023] [Accepted: 03/29/2023] [Indexed: 04/08/2023] Open
Abstract
A. acidoterrestris has been identified as the target bacterium in fruit juice production due to its high resistance to standard heat treatment. Multiple studies have shown that cold plasma can effectively inactivate pathogenic and spoilage microorganisms in juices. However, we are aware of only a few studies that have used cold plasma to inactivate A. acidoterrestris. In this study, the inactivation efficacy of cold plasma was determined using the plate count method and described using a biphasic model. The effects of the food matrix, input power, gas flow rate, and treatment time on inactivation efficacy were also discovered. Scavenging experiments with reactive oxygen species (•OH, •O2−, and 1O2), scanning electron microscopy (SEM), Raman spectra, as well as an in vitro toxicology assay kit, were used to determine the inactivation mechanism. According to the plate count method, a maximum reduction of 4.14 log CFU/ mL could be achieved within 7 s, and complete inactivation could be achieved within 240 s. The scavenging experiments showed that directly cold plasma-produced singlet oxygen plays the most crucial role in inactivation, which was also confirmed by the fluorescence probe SOSG. The scanning electron microscopy (SEM) and Raman spectra showed that the cold plasma treatment damaged the membrane integrity, DNA, proteins, lipids, and carbohydrates of A. acidoterrestris. The plate count results and the apple juice quality evaluation showed that the cold plasma treatment (1.32 kV) could inactivate 99% of A. acidoterrestris within 60 s, with no significant changes happening in apple juice quality, except for slight changes in the polyphenol content and color value.
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Affiliation(s)
- Hao Ding
- College of Food Science and Engineering, Northwest A&F University, Yangling 712100, China
- Laboratory of Quality & Safety Risk Assessment for Agro-Products (Yangling), Ministry of Agriculture, Yangling 712100, China
| | - Tiecheng Wang
- College of Natural Resources and Environment, Northwest A&F University, Yangling 712100, China
- Key Laboratory of Plant Nutrition and the Agri-Environment in Northwest China, Ministry of Agriculture, Yangling 712100, China
| | - Yuhan Sun
- College of Food Science and Engineering, Northwest A&F University, Yangling 712100, China
- Laboratory of Quality & Safety Risk Assessment for Agro-Products (Yangling), Ministry of Agriculture, Yangling 712100, China
| | - Yuxiang Zhang
- College of Food Science and Technology, Northwest University, Xi’an 710069, China
| | - Jianping Wei
- College of Food Science and Technology, Northwest University, Xi’an 710069, China
| | - Rui Cai
- College of Food Science and Engineering, Northwest A&F University, Yangling 712100, China
- Laboratory of Quality & Safety Risk Assessment for Agro-Products (Yangling), Ministry of Agriculture, Yangling 712100, China
| | - Chunfeng Guo
- College of Food Science and Engineering, Northwest A&F University, Yangling 712100, China
- Laboratory of Quality & Safety Risk Assessment for Agro-Products (Yangling), Ministry of Agriculture, Yangling 712100, China
| | - Yahong Yuan
- College of Food Science and Engineering, Northwest A&F University, Yangling 712100, China
- Laboratory of Quality & Safety Risk Assessment for Agro-Products (Yangling), Ministry of Agriculture, Yangling 712100, China
| | - Tianli Yue
- College of Food Science and Engineering, Northwest A&F University, Yangling 712100, China
- Laboratory of Quality & Safety Risk Assessment for Agro-Products (Yangling), Ministry of Agriculture, Yangling 712100, China
- College of Food Science and Technology, Northwest University, Xi’an 710069, China
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3
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Sajjadinezhad SM, Tanner K, Harvey PD. Metal-porphyrinic framework nanotechnologies in modern agricultural management. J Mater Chem B 2022; 10:9054-9080. [PMID: 36321474 DOI: 10.1039/d2tb01516a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
Metal-porphyrinic frameworks are an important subclass of metal-organic frameworks (MOFs). These porous materials exhibit a large number of applications for sustainable development and related environmental considerations. Their attractive features include (1) as a free base or metalated with zinc(II) or iron(II or III), they are environmentally benign, and (2) they absorb visible light and are emissive and semi-conducting, making them convenient tools for sensing agrochemicals. But the key feature that makes these nano-sized pristine materials or their composites in many ways superior to most MOFs is their ability to photo-generate reactive oxygen species with visible light, including singlet oxygen. This review describes important issues related to agriculture, including controlled delivery of pesticides and agrochemicals, detection of pesticides and pathogenic metals, elimination of pesticides and toxic metals, and photodynamic antimicrobial activity, and has an important implication for food safety. This comprehensive review presents the progress of the rather rapid developments of these functional and increasingly nano-sized materials and composites in the area of sustainable agriculture.
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Affiliation(s)
| | - Kevin Tanner
- Département de Chimie, Université de Sherbrooke, Sherbrooke, PQ, J1K 2R1, Canada.
| | - Pierre D Harvey
- Département de Chimie, Université de Sherbrooke, Sherbrooke, PQ, J1K 2R1, Canada.
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Schlachter A, Asselin P, Harvey PD. Porphyrin-Containing MOFs and COFs as Heterogeneous Photosensitizers for Singlet Oxygen-Based Antimicrobial Nanodevices. ACS APPLIED MATERIALS & INTERFACES 2021; 13:26651-26672. [PMID: 34086450 DOI: 10.1021/acsami.1c05234] [Citation(s) in RCA: 38] [Impact Index Per Article: 12.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Visible-light irradiation of porphyrin and metalloporphyrin dyes in the presence of molecular oxygen can result in the photocatalytic generation of singlet oxygen (1O2). This type II reactive oxygen species (ROS) finds many applications where the dye, also called the photosensitizer, is dissolved (i.e., homogeneous phase) along with the substrate to be oxidized. In contrast, metal-organic frameworks (MOFs) are insoluble (or will disassemble) when placed in a solvent. When stable as a suspension, MOFs adsorb a large amount of O2 and photocatalytically generate 1O2 in a heterogeneous process efficiently. Considering the immense surface area and great capacity for gas adsorption of MOFs, they seem ideal candidates for this application. Very recently, covalent-organic frameworks (COFs), variants where reticulation relies on covalent rather than coordination bonds, have emerged as efficient photosensitizers. This comprehensive mini review describes recent developments in the use of porphyrin-based or porphyrin-containing MOFs and COFs, including nanosized versions, as heterogeneous photosensitizers of singlet oxygen toward antimicrobial applications.
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Affiliation(s)
- Adrien Schlachter
- Département de Chimie, Université de Sherbrooke, Sherbrooke, Quebec J1K 2R1, Canada
| | - Paul Asselin
- Département de Chimie, Université de Sherbrooke, Sherbrooke, Quebec J1K 2R1, Canada
| | - Pierre D Harvey
- Département de Chimie, Université de Sherbrooke, Sherbrooke, Quebec J1K 2R1, Canada
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Harvey PD. Porphyrin-based MOFs as heterogeneous photocatalysts for the eradication of organic pollutants and toxins. J PORPHYR PHTHALOCYA 2021. [DOI: 10.1142/s1088424621300020] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
Water and air pollution are among the major environmental challenges of this era. Waste management, economic sustainable development and renewable energy are unavoidable concomitant considerations. Over the past five years, nanosized metal-organic frameworks (nano-MOFs) have been developed for the elimination of pollutants in wet media and air-born toxins using the highly efficient reactive oxygen species (ROS) of type I (H2O2, •OH, O[Formula: see text] and of type II (1O[Formula: see text]. The ROS are catalytically and efficiently generated through photosensitization, and porphyrins and metalloporphyrins are pigments of choice for this purpose. This short review summarizes the fundamentals of ROS generation by porphyrin-based nano-MOFs (mainly through the formation of ROS type II) and their composites (leading to ROS type I), which includes energy and electron transfer processes, and their applications in these environmental issues.
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Affiliation(s)
- Pierre D. Harvey
- Département de chimie, Université de Sherbrooke, Sherbrooke, PQ, Canada, J1K 2R1, Canada
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6
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Wang KK, Song S, Jung SJ, Hwang JW, Kim MG, Kim JH, Sung J, Lee JK, Kim YR. Lifetime and diffusion distance of singlet oxygen in air under everyday atmospheric conditions. Phys Chem Chem Phys 2020; 22:21664-21671. [PMID: 32608420 DOI: 10.1039/d0cp00739k] [Citation(s) in RCA: 23] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
Singlet oxygen is a toxic chemical but powerful oxidant, exploited in many chemical and biological applications. However, the lifetime of singlet oxygen in air under atmospheric conditions is yet to be known. This has limited safe usage of singlet oxygen in air, despite being a strong antimicrobial agent with the unique property of relaxing to breathable oxygen after serving its purpose. Here, we solve this long-standing problem by combining experimental and theoretical research efforts; we generate singlet oxygen using a photosensitizer at a local source and monitor the time-dependent extent of singlet oxygen reaction with probe molecules at a detector, precisely controlling the detector distance from the source. To explain our experimental results, we employ a theoretical model that fully accounts for singlet oxygen diffusion, radiative and nonradiative relaxations, and the bimolecular reaction with probe molecules at the detector. For all cases investigated, our model, with only two adjustable parameters, provides an excellent quantitative explanation of the experiment. From this analysis, we extract the lifetime of singlet oxygen in the air to be 2.80 s at 23 °C under 1 atm, during which time singlet oxygen diffuses about 0.992 cm. The correctness of this estimation is confirmed by a simple mean-first-passage time analysis of the maximum distance singlet oxygen can reach from the source. We also confirm the sterilization effects of singlet oxygen for distances up to 0.6-0.8 cm, depending on the bacteria strain in question, between the bacteria and the singlet oxygen source.
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Affiliation(s)
- Kang-Kyun Wang
- Department of Chemistry, Yonsei University, 50 Yonsei-ro, Seodaemun-gu, Seoul 03722, Republic of Korea.
| | - Sanggeun Song
- Department of Chemistry, Chung-Ang University, Seoul 06974, Korea. and Creative Research Initiative Center for Chemical Dynamics in Living Cells, Chung-Ang University, Seoul 06974, Korea
| | - Seung-Jin Jung
- Department of Chemistry, Yonsei University, 50 Yonsei-ro, Seodaemun-gu, Seoul 03722, Republic of Korea.
| | - Jung-Wook Hwang
- Department of Chemistry, Yonsei University, 50 Yonsei-ro, Seodaemun-gu, Seoul 03722, Republic of Korea.
| | - Min-Goo Kim
- Corporate R&D, LG Chemical Ltd., LG Science Park, Seoul 07796, Korea.
| | - Ji-Hyun Kim
- Creative Research Initiative Center for Chemical Dynamics in Living Cells, Chung-Ang University, Seoul 06974, Korea
| | - Jaeyoung Sung
- Department of Chemistry, Chung-Ang University, Seoul 06974, Korea. and Creative Research Initiative Center for Chemical Dynamics in Living Cells, Chung-Ang University, Seoul 06974, Korea
| | - Jin-Kyu Lee
- Corporate R&D, LG Chemical Ltd., LG Science Park, Seoul 07796, Korea.
| | - Yong-Rok Kim
- Department of Chemistry, Yonsei University, 50 Yonsei-ro, Seodaemun-gu, Seoul 03722, Republic of Korea.
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7
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Ohkubo K, Asahara H, Inoue T. Photochemical C-H oxygenation of side-chain methyl groups in polypropylene with chlorine dioxide. Chem Commun (Camb) 2019; 55:4723-4726. [PMID: 30942239 DOI: 10.1039/c9cc01037h] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
The chlorine dioxide radical (ClO2˙) was found to act as an efficient oxidizing agent for the aerobic C-H oxygenation of the side-chain methyl groups in polypropylene under photoirradiation and ambient conditions (298 K and 1 atm). The oxygenated side-chain methyl groups were selectively converted to carboxylic acid and hydroxy groups.
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Affiliation(s)
- Kei Ohkubo
- Institute for Advanced Co-Creation Studies, Osaka University, 2-8 Yamada-oka, Suita, Osaka 565-0871, Japan.
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8
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Fukuchi S, Yagi M, Oguchi-Fujiyama N, Kang J, Kikuchi A. A novel characteristic of salicylate UV absorbers: suppression of diethylhexyl 2,6-naphthalate (Corapan TQ)-photosensitized singlet oxygen generation. Photochem Photobiol Sci 2019; 18:1556-1564. [DOI: 10.1039/c9pp00104b] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
40% of the quantum yield of DEHN-photosensitized singlet oxygen generation is decreased by adding 32 mmol dm−3 EHS.
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Affiliation(s)
- Shirabe Fukuchi
- Department of Chemistry
- Graduate School of Engineering Science
- Yokohama National University
- Yokohama 240-8501
- Japan
| | - Mikio Yagi
- Department of Chemistry
- Graduate School of Engineering Science
- Yokohama National University
- Yokohama 240-8501
- Japan
| | | | - Jasmin Kang
- Shiseido Global Innovation Center
- Yokohama 224-8558
- Japan
| | - Azusa Kikuchi
- Department of Chemistry
- Graduate School of Engineering Science
- Yokohama National University
- Yokohama 240-8501
- Japan
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9
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Yoshino K, Iwamori S. Measurement of excited singlet oxygen molecule in a vacuum sterilization system, using electric spin resonance (ESR) with a water-soluble polymer thin film. J Photochem Photobiol A Chem 2016. [DOI: 10.1016/j.jphotochem.2016.04.009] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
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10
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Abstract
The intramolecular transfer of energy (FRET) and electrons (Dexter) are of great interest for the scientific community and are well-understood. In contrast, the intramolecular transfer of singlet oxygen ((1)O2), a reactive and short-lived oxygen species, has until now been unknown. This process would be very interesting because (1)O2 plays an important role in photodynamic therapy (PDT). Herein, we present the first successful intramolecular transfer of (1)O2 from a donor to acceptor. Also, we found a dependence of conformation and temperature comparable with those of FRET. We provide several pieces of evidence for the intramolecular character of this transfer, including competition experiments. Our studies should be interesting not only from the theoretical and mechanistic point of view but also for the design of new (1)O2 donors and applications in PDT.
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Affiliation(s)
- Matthias Klaper
- Department of Chemistry, University of Potsdam , 14476 Golm, Germany
| | - Torsten Linker
- Department of Chemistry, University of Potsdam , 14476 Golm, Germany
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11
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Klaper M, Linker T. New singlet oxygen donors based on naphthalenes: synthesis, physical chemical data, and improved stability. Chemistry 2015; 21:8569-77. [PMID: 25919359 DOI: 10.1002/chem.201500146] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2015] [Indexed: 12/29/2022]
Abstract
Singlet oxygen donors are of current interest for medical applications, but suffer from a short half-life leading to low singlet oxygen yields and problems with storage. We have synthesized more than 25 new singlet oxygen donors based on differently substituted naphthalenes in only a few steps. The influence of functional groups on the reaction rate of the photooxygenations, thermolysis, half-life, and singlet oxygen yield has been thoroughly studied. We determined various thermodynamic data and compared them with density functional calculations. Interestingly, remarkable stabilities of functional groups during the photooxygenations and stabilizing effects for some endoperoxides during the thermolysis have been found. Furthermore, we give evidence for a partly concerted and partly stepwise thermolysis mechanism leading to singlet and triplet oxygen, respectively. Our results might be interesting for "dark oxygenations" and future applications in medicine.
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Affiliation(s)
- Matthias Klaper
- Department of Chemistry, University of Potsdam, Karl-Liebknecht-Strasse 24-25, 14476 Potsdam (Germany)
| | - Torsten Linker
- Department of Chemistry, University of Potsdam, Karl-Liebknecht-Strasse 24-25, 14476 Potsdam (Germany).
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12
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Ovechkin AS, Kartsova LA. Methods for the detection and determination of singlet oxygen. JOURNAL OF ANALYTICAL CHEMISTRY 2014. [DOI: 10.1134/s1061934815010116] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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13
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Ruzzi M, Sartori E, Moscatelli A, Khudyakov IV, Turro NJ. Time-Resolved EPR Study of Singlet Oxygen in the Gas Phase. J Phys Chem A 2013; 117:5232-40. [DOI: 10.1021/jp403648d] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Marco Ruzzi
- Department of Chemical Sciences, University of Padova, 35100 Padova, Italy
| | - Elena Sartori
- Chemistry Department, Columbia University, New York, New York 10027, United
States
| | - Alberto Moscatelli
- Chemistry Department, Columbia University, New York, New York 10027, United
States
| | - Igor V. Khudyakov
- Chemistry Department, Columbia University, New York, New York 10027, United
States
| | - Nicholas J. Turro
- Chemistry Department, Columbia University, New York, New York 10027, United
States
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Ito D, Takahashi Y, Saito H, Nosaka Y. Photosensitizer Dye Nanoparticle-coated Membranes for Singlet Oxygen Generation under Atmospheric Conditions. CHEM LETT 2012. [DOI: 10.1246/cl.2012.877] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Daiki Ito
- Top Runner Incubation Center for Academic-Industry Fusion, Nagaoka University of Technology
| | - Yukiko Takahashi
- Top Runner Incubation Center for Academic-Industry Fusion, Nagaoka University of Technology
| | - Hironobu Saito
- Top Runner Incubation Center for Academic-Industry Fusion, Nagaoka University of Technology
| | - Yoshio Nosaka
- Top Runner Incubation Center for Academic-Industry Fusion, Nagaoka University of Technology
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15
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Shinohara KI, Kodera N, Oohashi T. Single-molecule imaging of photodegradation reaction in a chiral helical π-conjugated polymer chain. ACTA ACUST UNITED AC 2010. [DOI: 10.1002/pola.24201] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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16
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Observation of collision-induced near-IR emission of singlet oxygen O2 a1Δg generated by visible light excitation of gaseous O2 dimol. Chem Phys Lett 2009. [DOI: 10.1016/j.cplett.2009.02.020] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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