506
S. Okada et al.
Table 24.1
Monomer conformation, packing parameters d
and
θ, carbon-carbon distance between adjacent molecules, and absorption maximum wavelength
(λ
max ) of the polymer
Compound
Butylene conformation a
d b
/Å
θ b
/°
C1·
· · C2 c
C3·
· · C4 c
/Å
C1·
· · C4 c
/Å
λ
max /nm
1a
gtg
5.19
47.4
4.47
3.83
637
1b
ttt
4.99
51.6
4.34–4.35
3.97
660
1c
gtg
5.16
48.1
4.45
3.86
672
1d
ttt
4.97–5.07
70.5–71.3
4.73–4.85
5.10–5.27
–
1e
gtg,ttt
5.94
41.1, 53.3–55.7
5.09–5.12, 5.29–5.45
3.97, 4.77
–
1f
ttt
5.11
45.7
4.35–4.37
3.66
610
2e
ttt
5.09
61.4
4.63
4.67
–
2f
ggg
5.07–5.17
48.5–49.8
4.29–4.50
3.85–3.94
580
a
Symbols g
and t
indicate gauche
and trans
forms of ethylenes in the butylene group between butadiyne and urethane moieties
b
See Fig. 24.1
c
See Fig. 24.4