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Abstract
The increasing importance of visible light photoredox catalysis as a powerful strategy
for the activation of small molecules require the development of new effective radical
sources and photocatalysts. The unique properties of organoboron compounds have contributed
significantly to the rapid progress of photocatalysis. Since the first work on the topic in
2005, many researchers have appreciated the role of boron-containing compounds in photocatalysis,
and this is reflected in several publications. In this review, we highlight the utility of
organoboron compounds in various photocatalytic reactions enabling the construction of carbon-
carbon and carbon-heteroatom bonds. The dual role of organoboron compounds in photocatalysis
is highlighted by their applications as reactants and as well as organic photocatalysts.
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Affiliation(s)
- Tomasz Kliś
- Warsaw University of Technology, Faculty of Chemistry, Noakowskiego 3, 00-664 Warsaw, Poland
| | - Marcin Kublicki
- Warsaw University of Technology, Faculty of Chemistry, Noakowskiego 3, 00-664 Warsaw, Poland
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2
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Kathiravan A, Anbazhagan V, Asha Jhonsi M, Renganathan R. A Study on the Fluorescence Quenching of Eosin by certain Organic Dyes. ACTA ACUST UNITED AC 2009. [DOI: 10.1524/zpch.2008.5267] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Abstract
Abstract
The fluorescence quenching of Eosin by certain dyes has been investigated using steady state technique. The dyes used are Uniblue-A, Acid blue 129, Alizarin, Alizarin red S, Erichrome Black T, Tartrazine, Methyl orange, Methyl red, Acid orange 63, Congo red. The quenching was found to obey the Stern-Volmer equation and the corresponding Stern-Volmer plots were linear in the range of quencher concentration used [0−5×10−
5] M. The quenching rate constant (k
q
) is in the range of 0.85–26.65×1012 M−
1s−
1. The quenching mechanism is discussed on the basis of the quenching rate constants as well as the reduction potential of the dyes. Rehm-Weller equation is applied for the calculation of free energy change (ΔGet).
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7
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Abstract
Flavin-zinc(II)-cyclen 10 contains a covalently linked substrate binding site (zinc(II)-cyclen) and a chromophore unit (flavin). Upon irradiation, compound 10 effectively oxidizes 4-methoxybenzyl alcohol (11-OCH3) to the corresponding benzaldehyde both in water and in acetonitrile. In the presence of air, the reduced flavin 10-H2 is reoxidized, and so catalytic amounts of 10 are sufficient for alcohol conversion. The mechanism of oxidation is based on photoinduced electron transfer from the coordinated benzyl alcohol to the flavin chromophore. This intramolecular process provides a much higher photooxidation efficiency, with quantum yields 30 times those of the comparable intermolecular process with a flavin chromophore without a binding site. For the reaction in buffered aqueous solution a quantum yield of Phi = 0.4 is observed. The turnover number in acetonitrile is increased (up to 20) by high benzyl alcohol concentrations. The results show that the covalent combination of a chromophore and a suitable binding site may lead to photomediators more efficient than classical sensitizer molecules.
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Affiliation(s)
- Radek Cibulka
- Institute of Organic Chemistry, Department of Chemical Technology, Prague Technická 5, 16628 Prague 6, Czech Republic.
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Hattori S, Hasobe T, Ohkubo K, Urano Y, Umezawa N, Nagano T, Wada Y, Yanagida S, Fukuzumi S. Enhanced Energy and Quantum Efficiencies of a Nanocrystalline Photoelectrochemical Cell Sensitized with a Donor−Acceptor Dyad Derived from Fluorescein. J Phys Chem B 2004. [DOI: 10.1021/jp047656p] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Shigeki Hattori
- Department of Material and Life Science, Graduate School of Engineering, Osaka University, Suita, Osaka 565-0871, Japan, CREST, Japan Science and Technology Agency, Suita, Osaka 565-0871, Japan, and Graduate School of Pharmaceutical Sciences, The University of Tokyo, Bunkyo-ku, Tokyo 113-0033, Japan
| | - Taku Hasobe
- Department of Material and Life Science, Graduate School of Engineering, Osaka University, Suita, Osaka 565-0871, Japan, CREST, Japan Science and Technology Agency, Suita, Osaka 565-0871, Japan, and Graduate School of Pharmaceutical Sciences, The University of Tokyo, Bunkyo-ku, Tokyo 113-0033, Japan
| | - Kei Ohkubo
- Department of Material and Life Science, Graduate School of Engineering, Osaka University, Suita, Osaka 565-0871, Japan, CREST, Japan Science and Technology Agency, Suita, Osaka 565-0871, Japan, and Graduate School of Pharmaceutical Sciences, The University of Tokyo, Bunkyo-ku, Tokyo 113-0033, Japan
| | - Yasuteru Urano
- Department of Material and Life Science, Graduate School of Engineering, Osaka University, Suita, Osaka 565-0871, Japan, CREST, Japan Science and Technology Agency, Suita, Osaka 565-0871, Japan, and Graduate School of Pharmaceutical Sciences, The University of Tokyo, Bunkyo-ku, Tokyo 113-0033, Japan
| | - Naoki Umezawa
- Department of Material and Life Science, Graduate School of Engineering, Osaka University, Suita, Osaka 565-0871, Japan, CREST, Japan Science and Technology Agency, Suita, Osaka 565-0871, Japan, and Graduate School of Pharmaceutical Sciences, The University of Tokyo, Bunkyo-ku, Tokyo 113-0033, Japan
| | - Tetsuo Nagano
- Department of Material and Life Science, Graduate School of Engineering, Osaka University, Suita, Osaka 565-0871, Japan, CREST, Japan Science and Technology Agency, Suita, Osaka 565-0871, Japan, and Graduate School of Pharmaceutical Sciences, The University of Tokyo, Bunkyo-ku, Tokyo 113-0033, Japan
| | - Yuji Wada
- Department of Material and Life Science, Graduate School of Engineering, Osaka University, Suita, Osaka 565-0871, Japan, CREST, Japan Science and Technology Agency, Suita, Osaka 565-0871, Japan, and Graduate School of Pharmaceutical Sciences, The University of Tokyo, Bunkyo-ku, Tokyo 113-0033, Japan
| | - Shozo Yanagida
- Department of Material and Life Science, Graduate School of Engineering, Osaka University, Suita, Osaka 565-0871, Japan, CREST, Japan Science and Technology Agency, Suita, Osaka 565-0871, Japan, and Graduate School of Pharmaceutical Sciences, The University of Tokyo, Bunkyo-ku, Tokyo 113-0033, Japan
| | - Shunichi Fukuzumi
- Department of Material and Life Science, Graduate School of Engineering, Osaka University, Suita, Osaka 565-0871, Japan, CREST, Japan Science and Technology Agency, Suita, Osaka 565-0871, Japan, and Graduate School of Pharmaceutical Sciences, The University of Tokyo, Bunkyo-ku, Tokyo 113-0033, Japan
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