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Kobayashi H, Takeuchi K, Morinaga Y, Honda H, Yamamoto M, Odanaka Y, Inagaki M. Inter-Spin Interactions of 1D Chains of Different-Sized Nitroxide Radicals Incorporated in the Organic 1D Nanochannels of Tris( o-phenylenedioxy)cyclotriphosphazene. BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 2022. [DOI: 10.1246/bcsj.20220062] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Hirokazu Kobayashi
- Faculty of Arts and Sciences at Fujiyoshida, Showa University, 4562, Kami-yoshida, Fuji-yoshida-shi, Yamanashi, 403-0005, Japan
| | - Kanae Takeuchi
- Department of Chemistry, College of Humanities and Sciences, Nihon University, 3-25-40, Sakura-jo-sui, Setagaya-ku, Tokyo, 156-8550, Japan
| | - Yuka Morinaga
- Department of Chemistry, College of Humanities and Sciences, Nihon University, 3-25-40, Sakura-jo-sui, Setagaya-ku, Tokyo, 156-8550, Japan
| | - Hidehiko Honda
- Faculty of Arts and Sciences at Fujiyoshida, Showa University, 4562, Kami-yoshida, Fuji-yoshida-shi, Yamanashi, 403-0005, Japan
| | - Masato Yamamoto
- Faculty of Arts and Sciences at Fujiyoshida, Showa University, 4562, Kami-yoshida, Fuji-yoshida-shi, Yamanashi, 403-0005, Japan
| | - Yuki Odanaka
- Department of Pharmaceutical Sciences, Division of Bioanalytical Chemistry, Showa University, 1-5-8, Hatanodai, Shinagawa-ku, Tokyo 142-8555, Japan
| | - Masahiro Inagaki
- Faculty of Arts and Sciences at Fujiyoshida, Showa University, 4562, Kami-yoshida, Fuji-yoshida-shi, Yamanashi, 403-0005, Japan
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Kobayashi H, Mori T, Morinaga Y, Fujimori E, Akiniwa K, Iwahori F. Electron Spin Resonance Study of Molecular Orientation and Dynamics of Phenyl Imino and Nitronyl Nitroxide Radicals in Organic 1D Nanochannels of Tris( o-phenylenedioxy)cyclotriphosphazene. J Phys Chem A 2018; 122:5493-5502. [PMID: 29878777 DOI: 10.1021/acs.jpca.8b01806] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Imino and nitronyl nitroxide (IN and NN, respectively) radicals such as phenyliminonitroxide (PhIN) and phenylnitronylnitroxide (PhNN), respectively, were dispersed in the organic 1D nanochannels of tris( o-phenylenedioxy)cyclotriphosphazene (TPP). Electron spin resonance (ESR) measurements were conducted on these inclusion compounds (ICs) in the temperature range 4.2-300 K. The modulated-septet ESR spectra of TPP ICs using PhIN observed in the range 165-258 K were reproduced with the EasySpin program package using a model in which some of the PhIN molecules underwent uniaxial rotational diffusion in the TPP nanochannels around the molecular long axis corresponding to the principal y-axis of the g tensor. However, for the TPP IC using PhNN, complicated ESR spectra were observed, which were not consistent with the modulated quintet observed in solution or in the fast-motion limit in solids. These spectra were reproduced by the superposition of a quintet originating from rotational diffusion of PhNN molecules and a septet based on rotational diffusion of PhIN molecules generated in the synthetic process. The rotational diffusion activation energies of PhIN and PhNN in the TPP nanochannels were estimated to be 19 and 45 kJ mol-1 using an Arrhenius plot, respectively. These were consistent with that for NN radicals in the 1D nanochannels of 2,4,6-tris(4-chlorophenoxy)-1,3,5-triazine (CLPOT) (37-54 kJ mol-1) with a larger pore diameter than TPP reported in our previous study, or with that for 4-substituted-2,2,6,6-tetramethyl-1-piperidinyloxyl (4-X-TEMPO) in TPP nanochannels (5-26 kJ mol-1) with regard to molecular size or host-guest or guest-guest interactions. These results indicate that not only the NN group but also IN may be used for the clarification of chemical or biological structures of nanomaterials such as nanosized cavities.
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Affiliation(s)
- Hirokazu Kobayashi
- Faculty of Arts and Sciences at Fujiyoshida , Showa University , 4562, Kami-yoshida , Fuji-yoshida-shi, Yamanashi 403-0005 , Japan
| | - Takanori Mori
- Department of Chemistry, College of Humanities and Sciences , Nihon University , 3-25-40, Sakura-jo-sui , Setagaya-ku, Tokyo 156-8550 , Japan
| | - Yuka Morinaga
- Department of Chemistry, College of Humanities and Sciences , Nihon University , 3-25-40, Sakura-jo-sui , Setagaya-ku, Tokyo 156-8550 , Japan
| | - Etsuko Fujimori
- Department of Chemistry, College of Humanities and Sciences , Nihon University , 3-25-40, Sakura-jo-sui , Setagaya-ku, Tokyo 156-8550 , Japan
| | - Kento Akiniwa
- Graduate School of Integrated Basic Sciences, College of Humanities and Sciences , Nihon University , 3-25-40, Sakura-jo-sui , Setagaya-ku, Tokyo 156-8550 , Japan
| | - Fumiyasu Iwahori
- Department of Chemistry, College of Humanities and Sciences , Nihon University , 3-25-40, Sakura-jo-sui , Setagaya-ku, Tokyo 156-8550 , Japan
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