Inter-Spin Interactions of 1D Chains of Different-Sized Nitroxide Radicals Incorporated in the Organic 1D Nanochannels of Tris(o-phenylenedioxy)cyclotriphosphazene

Variable-temperature electron spin resonance (ESR) was measured for one-dimensional (1D) molecular chains formed using different-sized organic radicals incorporated into the 1D nanochannels of tris(o-phenylenedioxy)cyclotriphosphazene (TPP). The ESR spectra for the molecular chains of 4-oxo-2,2,6,6-...

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Bibliographic Details
Published inBulletin of the Chemical Society of Japan Vol. 95; no. 6; pp. 981 - 988
Main Authors Kobayashi, Hirokazu, Takeuchi, Kanae, Morinaga, Yuka, Honda, Hidehiko, Yamamoto, Masato, Odanaka, Yuki, Inagaki, Masahiro
Format Journal Article
LanguageEnglish
Published Tokyo The Chemical Society of Japan 15.06.2022
Chemical Society of Japan
Subjects
Chain dynamics
Diffusion
Electron paramagnetic resonance
Electron spin
Low temperature
Molecular chains
Molecular motion
Nanochannels
Radicals
Room temperature
Spin resonance
Inclusion compound
Organic magnets
1D exchange interaction
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Summary:Variable-temperature electron spin resonance (ESR) was measured for one-dimensional (1D) molecular chains formed using different-sized organic radicals incorporated into the 1D nanochannels of tris(o-phenylenedioxy)cyclotriphosphazene (TPP). The ESR spectra for the molecular chains of 4-oxo-2,2,6,6-tetramethyl-1-piperidinyl-1-oxyl (TEMPONE) incorporated in the TPP nanochannels ([TPP-TEMPONE]) exhibited anisotropic three-dimensional (3D) spin diffusion at temperatures close to room temperature. In contrast, 1D spin diffusion was observed even at low temperatures indicating a longer rotational diffusion correlation time or the termination of molecular motion of the guest radicals dispersed in the TPP nanochannels. The temperature range for 1D spin diffusion in [TPP-TEMPONE] was higher and wider than that of TPP inclusion compounds incorporating smaller nitroxide radicals, such as di-t-butyl nitroxide (DTBN), or 2,2,6,6-tetramethyl-1-piperidinyl-1-oxyl (TEMPO) radicals, as previously reported. Thus, inter-spin interactions of the organic-radical 1D molecular chains formed in size-adjustable nanochannels, such as TPP, are influenced by the molecular size and dynamics of guest radicals, and temperature.
ISSN:0009-2673
1348-0634
DOI:10.1246/bcsj.20220062