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O
O
LiO
2
C
CO
2
Li
OLi
LiO
N
N
O
NH
HN
O
N
N
S
S
O
O
S
S
HN
NH
NH
O
O
•
S
S
C
N
N
S
S
LiO
2
C
CO
2
Li
S
S
CO
2
LI
LiO
2
C
S
S
LiO
2
C
HN
O
CO
2
Li
N
N
N
LiO
2
C
HN
NH
CO
2
Li
O
O
88
CH(D)
2
NR
2
CH(D)
2
NR
2
S
S
S
S
S
S
S
S
S
S
S
S
1) KOH
EtO
2
C
C
OH
HO
2
C
C
•
2) CF
3
CO
2
H
S
S
(1.27)
SS
SS
S
S
S
S
S
S
CH(D)
2
NR
2
CH(D)
2
NR
2
89
90
Continuous wave spectra at W-band of four triarylmethyl (trityl) radicals at 100 K in 1 : 1 water/glycerol
exhibit rhombic EPR spectra.
31b
The results are consistent with assignment of the Raman process and a
local mode as the dominant relaxation processes.
Low frequency (300 MHz) pulsed EPR with pulsed FID detection of triarylmethyl radicals injected
in mice was used to obtain three-dimensional oxymetric images.
32a,b
Single-point imaging, a technique
developed for solid state NMR, applied to pulsed EPR imaging yielded artifact-free spatial images.
32a
Continuous wave EPR imaging was used to obtain slice-selective images of free radicals without measuring
three-dimensional (3D) projection data.
32c
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