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Oguma Y, Yamamoto M, Sunatsuki Y, Ota H, Yamaji M, Okamoto H. Intramolecular [π4s + π4s] photocycloaddition of carbon- and nitrogen-bridged [3 2](1,4)naphthalenophanes. Photochem Photobiol Sci 2024; 23:1509-1519. [PMID: 38981991 DOI: 10.1007/s43630-024-00610-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2024] [Accepted: 06/30/2024] [Indexed: 07/11/2024]
Abstract
[32](1,4)Naphthalenophanes, bearing carbon-bridge chains (syn- and anti-NPs) and nitrogen-bridge chains (syn- and anti-ANPs), were synthesized, and their X-ray structures and photoreactions were investigated. The intramolecular separation distance between the naphthalene cores for ANPs was shorter than that for NPs, suggesting that intramolecular interactions between the naphthalene rings were more efficient for ANPs compared to NPs. Upon photoirradiation at 300 nm, anti-NP, syn-ANP and anti-ANP produced the corresponding intramolecular [π4s + π4s] cycloadducts, whereas syn-NP gave an unidentified complex product mixture. Quantum yields for the photo-consumption (ΦPC) of NPs and ANPs were evaluated to quantitatively compare their photoreactivity. The ΦPC values of ANPs were approximately two-fold higher than those of ANPs.Noteworthily, the ΦPC value of syn-ANP was estimated to be unity. Based on these results we discuss the effects of the alignments of the naphthalene cores (anti vs. syn) and the bridging elements (C-bridge vs. N-bridge) on the photoreaction efficiencies of [32](1,4)naphthalenophanes.
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Affiliation(s)
- Yukiko Oguma
- Division of Earth, Life, and Molecular Sciences, Graduate School of Natural Science and Technology, Okayama University, Tsushima-Naka 3-1-1, Kita-Ku, Okayama, 700-8350, Japan
| | - Masanori Yamamoto
- Division of Earth, Life, and Molecular Sciences, Graduate School of Natural Science and Technology, Okayama University, Tsushima-Naka 3-1-1, Kita-Ku, Okayama, 700-8350, Japan
| | - Yukinari Sunatsuki
- Division of Earth, Life, and Molecular Sciences, Graduate School of Natural Science and Technology, Okayama University, Tsushima-Naka 3-1-1, Kita-Ku, Okayama, 700-8350, Japan
| | - Hiromi Ota
- Department of Instrumental Analysis, Advanced Science Research Center, Okayama University, Tsushima-Naka 3-1-1, Kita-Ku, Okayama, 700-8530, Japan
| | - Minoru Yamaji
- Division of Molecular Science, Graduate School of Science and Engineering, Gunma University, Honcho 29-1, Ota, Gunma, 373-0057, Japan
| | - Hideki Okamoto
- Division of Earth, Life, and Molecular Sciences, Graduate School of Natural Science and Technology, Okayama University, Tsushima-Naka 3-1-1, Kita-Ku, Okayama, 700-8350, Japan.
- Department of Chemistry, Faculty of Environmental, Life and Natural Science and Technology, Okayama University, Tsushima-Naka 3-1-1, Kita-Ku, Okayama, 700-8350, Japan.
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Zareie MH, Barber J, McDonagh AM. Structural Changes in Self-Assembled Monolayers Initiated by Ultraviolet Light. J Phys Chem B 2006; 110:15951-4. [PMID: 16898750 DOI: 10.1021/jp062489+] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Self-assembled monolayers of 2-anthracenethiol and 2-naphthalenethiol on gold (111) were irradiated with low-power UV light. Scanning tunneling microscope images recorded in situ show unusual structural changes. In the case of 2-anthracenethiol, structures measuring 4-7 nm wide and 30-40 nm in length are formed. Images taken 10 min after irradiation ceased to show further surface reorganization. With 2-naphthalenethiol SAMs, smaller structures form upon irradiation, which subsequently revert to resemble the original structure after time.
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Affiliation(s)
- M Hadi Zareie
- Institute for Nanoscale Technology, University of Technology Sydney, PO Box 123, Broadway NSW 2007, Australia
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