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Nishimura T, Sasaki Y, Tachi Y, Suzuki S, Okada K, Kozaki M. Inhibition of Ligand Binding Ability of Three Porphyrins by an Organic Effector. Chem Asian J 2020; 15:594-600. [PMID: 31903693 DOI: 10.1002/asia.201901711] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2019] [Revised: 12/27/2019] [Indexed: 11/09/2022]
Abstract
A stimulus-responsive receptor 1 was designed and prepared to control the ligand-binding ability of three active sites, two zinc tetraphenylporphyrin units (P1) and one zinc diethynyldiphenylporphyrin unit (P2), with one effector molecule 2. Bulky hexarylbenzene units were incorporated as shielding panels in the middle of the flexible side arms of 1. Spectroscopic titrations indicated that a stable supramolecular complex 1⋅2 (K1⋅2 =6.7×106 m-1 ) was produced by the cooperative formation of multiple hydrogen and coordination bonds. As a result, the binding of a ligand to P1 was inhibited by 2 in a competitive manner. Additionally, the formation of 1⋅2 brought about conformational restriction of the side arms to cover both faces of P2 with the shielding panels. The binding constant of 4-phenylpyridine with P2 in 1⋅2 decreased to 8.9 % of that in 1. Namely, the ligand-binding ability of P2 was inhibited according to an allosteric mechanism.
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Affiliation(s)
- Tomoaki Nishimura
- Graduate School of Science, Osaka City University, Sugimoto, Sumiyoshi-ku, Osaka, 558-8585, Japan
| | - Yoshito Sasaki
- Graduate School of Science, Osaka City University, Sugimoto, Sumiyoshi-ku, Osaka, 558-8585, Japan
| | - Yoshimitsu Tachi
- Graduate School of Science, Osaka City University, Sugimoto, Sumiyoshi-ku, Osaka, 558-8585, Japan
| | - Shuichi Suzuki
- Graduate School of Engineering Science, Osaka University, Toyonaka, Osaka, 560-8531, Japan
| | - Keiji Okada
- Graduate School of Science, Osaka City University, Sugimoto, Sumiyoshi-ku, Osaka, 558-8585, Japan.,Osaka City University, Advanced Research Institute for Natural Science and Technology (OCARINA), Sugimoto, Sumiyoshi-ku, Osaka, 558-8585, Japan
| | - Masatoshi Kozaki
- Graduate School of Science, Osaka City University, Sugimoto, Sumiyoshi-ku, Osaka, 558-8585, Japan.,Osaka City University, Advanced Research Institute for Natural Science and Technology (OCARINA), Sugimoto, Sumiyoshi-ku, Osaka, 558-8585, Japan
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Saberi D, Hashemi H, Ghanaatzadeh N, Moghadam M, Niknam K. Ruthenium/dendrimer complex immobilized on silica‐functionalized magnetite nanoparticles catalyzed oxidation of stilbenes to benzil derivatives at room temperature. Appl Organomet Chem 2020. [DOI: 10.1002/aoc.5563] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Affiliation(s)
- Dariush Saberi
- Fisheries and Aquaculture Department, College of Agriculture and Natural ResourcesPersian Gulf University Bushehr 75169 Iran
- Marine Chemistry Department, Faculty of Marine Science and TechnologyPersian Gulf University Bushehr 75169 Iran
| | - Hajar Hashemi
- Department of Chemistry, Faculty of SciencesPersian Gulf University Bushehr 75169 Iran
| | - Niloofar Ghanaatzadeh
- Department of Chemistry, Faculty of SciencesPersian Gulf University Bushehr 75169 Iran
| | - Majid Moghadam
- Catalysis Division, Department of ChemistryUniversity of Isfahan Isfahan 81746‐73441 Iran
| | - Khodabakhsh Niknam
- Department of Chemistry, Faculty of SciencesPersian Gulf University Bushehr 75169 Iran
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