Chapter 12
Inter-spin Interactions of Organic
Radical Chains in Organic 1D
Nanochannels: An ESR Study
of the Molecular Orientations
and Dynamics of Guest Radicals
Hirokazu Kobayashi
Abstract Unique inter-spin interaction appears in one-dimensional (1D) organic
inclusion compounds which are synthesized by using 2,4,6-tris(4-chlorophenoxy)1,3,5-triazine (CLPOT) and (o-phenylenedioxy) cyclotri phosphazene (TPP).
Molecular orientations and dynamics of guest radicals incorporated in CLPOT or
TPP nanochannels have been investigated using variable-temperature electron spin
resonance (ESR) measurement, together with ESR simulation. When 4-substituted2,2,6,6-tetramethyl-1-piperidinyloxyl (4-X-TEMPO) is incorporated in 1D CLPOT
and TPP nanochannels, they exhibited three-dimensional, temperature-independent
or 1D, temperature-dependent exchange interactions. It will be possible to design
and develop innovative organic magnet based on these features.
Keywords Inclusion compound · 1D nanochannel · Molecular dynamics ·
Organic magnet · ESR measurement · ESR simulation
12.1 Introduction of Inclusion Compounds
Various new organic functional materials intended for the development of inclusion compounds (ICs) have been developed over the last few decades [1–13].
The guest molecules in ICs occupy nanosized cavities, nanochannels, molecular
sheets or jungle-jim-like frameworks in host lattices [12, 14, 15]. The guest compounds within host compounds are mainly governed by van der Waals interaction.
Figure 12.1 demonstrates the images of zero- to three-dimensional nanospaces
and the included guest molecules. The nanospaces within the host materials are
called as one-dimensional (1D) when their structures are tunnel-like cavities,
H. Kobayashi ()
Faculty of Arts and Sciences at Fujiyoshida, Showa University, Yamanashi, Japan
e-mail: hirawk@cas.showa-u.ac.jp
© Springer Nature Singapore Pte Ltd. 2020
T. Onishi (ed.), Theoretical Chemistry for Advanced Nanomaterials,
https://doi.org/10.1007/978-981-15-0006-0_12
423
Inter-spin Interactions of Organic
Radical Chains in Organic 1D
Nanochannels: An ESR Study
of the Molecular Orientations
and Dynamics of Guest Radicals
Hirokazu Kobayashi
Abstract Unique inter-spin interaction appears in one-dimensional (1D) organic
inclusion compounds which are synthesized by using 2,4,6-tris(4-chlorophenoxy)1,3,5-triazine (CLPOT) and (o-phenylenedioxy) cyclotri phosphazene (TPP).
Molecular orientations and dynamics of guest radicals incorporated in CLPOT or
TPP nanochannels have been investigated using variable-temperature electron spin
resonance (ESR) measurement, together with ESR simulation. When 4-substituted2,2,6,6-tetramethyl-1-piperidinyloxyl (4-X-TEMPO) is incorporated in 1D CLPOT
and TPP nanochannels, they exhibited three-dimensional, temperature-independent
or 1D, temperature-dependent exchange interactions. It will be possible to design
and develop innovative organic magnet based on these features.
Keywords Inclusion compound · 1D nanochannel · Molecular dynamics ·
Organic magnet · ESR measurement · ESR simulation
12.1 Introduction of Inclusion Compounds
Various new organic functional materials intended for the development of inclusion compounds (ICs) have been developed over the last few decades [1–13].
The guest molecules in ICs occupy nanosized cavities, nanochannels, molecular
sheets or jungle-jim-like frameworks in host lattices [12, 14, 15]. The guest compounds within host compounds are mainly governed by van der Waals interaction.
Figure 12.1 demonstrates the images of zero- to three-dimensional nanospaces
and the included guest molecules. The nanospaces within the host materials are
called as one-dimensional (1D) when their structures are tunnel-like cavities,
H. Kobayashi ()
Faculty of Arts and Sciences at Fujiyoshida, Showa University, Yamanashi, Japan
e-mail: hirawk@cas.showa-u.ac.jp
© Springer Nature Singapore Pte Ltd. 2020
T. Onishi (ed.), Theoretical Chemistry for Advanced Nanomaterials,
https://doi.org/10.1007/978-981-15-0006-0_12
423