12 Inter-spin Interactions of Organic Radical Chains in Organic 1D. . .
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Fig. 12.12 Images of intermolecular distance and inter-spin interaction between radicals included
in 1D nanochannel described in Sects. 12.4 and 12.5. (a) Isolated radical dispersed by spacer in
CLPOT or TPP nanochannel described in Sects. 12.4 and 12.5. (b) 1D molecular chain of organic
radicals in CLPOT and TPP nanochannel described in this section
In this section, the inter-spin interaction of 1D molecular chains of 4-X-TEMPO
constructed in CLPOT and TPP nanochannels (without any spacers; see Fig. 12.12b)
is discussed herein, based on the ESR spectra of [(CLPOT)-(4-X-TEMPO)] and
[(TPP)-(4-X-TEMPO)]. In particular, the dimensionality and magnitude of these
interactions are examined in terms of the molecular dynamics of guest radicals
in the CLPOT and TPP nanochannels. Approximately, the inter-spin interactions
of organic radical chain in CLPOT nanochannel are independent of the molecular
orientations and dynamics of guest radicals, whereas those in TPP nanochannel are
affected by the molecular dynamics of guest radicals described in Sects. 12.4 and
12.5.
Figure 12.13 summarizes the effect of temperature on the peak-to-peak
line width ΔB pp values (see Sect. 12.2.4) associated with the ESR spectra
of [(TPP) 2 -(TEMPO) 1.0 ] (1a/2a; diagonal crosses), [(CLPOT) 2 -(TEMPO) 1.0 )]
(1b/2a; yellow triangles), [(CLPOT) 2 -(TEMPOL) 1.0 )] (1a/2c; empty circles),
[(CLPOT) 2 -(TEMPONE) 1.1 )] (1a/2b; magenta diamonds), and [(CLPOT) 2 -(MeOTEMPOL) 0.91 )] (1a/2d; cyan squares) over the temperature range from 4.2 to