structure, which induced large chirality in both the ground state and the excited state.
The specific rotation reached 1500 (c 0.5, CHCl 3 ), and the molar ellipticity was
approximately 3,000,000 deg cm
2 dmol
À1 . Molecule 5 emitted intense CPL, and the
spectra of the enantiomers are shown in Fig. 3.14. The |g lum | value at λ PL,max was
estimated to be in the order of 10
À2 , with |g lum | ¼ 1.3 Â 10
–2 . This g lum value is large
for a monodispersed organic molecule in solution. The optically active secondordered structure, i.e., optically active propeller-shaped structure, contributes greatly
to the induction of chirality in the excited state. Although the Φ PL was 0.45, the
(R p )-1 max = 407 nm
(R p )-2 max = 414 nm
(R p )-3 max = 415 nm
CPL
PL
350
400
450
500
550
600
I
L –I
R / a.u.
Intensity / a.u.
Wavelength / nm
(R p )-1
(R p )-2
(R p )-3
(S p )-1
(S p )-2
(S p )-3
(R p )-1
(R p )-2
(R p )-3
1 |g lum | = 1.8 x 10
–3
2 |g lum | = 2.2 x 10 –3
3 |g lum | = 2.6 x 10 –3
350
400
450
500
550
600
2 |g lum | = 2.2 x 10
–3
4 |g lum | = 2.2 x 10
–3
(R p )-2 max = 414 nm
(R p )-4 max = 414 nm
CPL
PL
I
L –I
R / a.u.
Intensity / a.u.
Wavelength / nm
(R p )-2
(R p )-4
(S p )-2
(S p )-4
(R p )-2
(R p )-4
increase
constant
(A)
(B)
l
l
l
l
D
D
l
Fig. 3.11 (a) CPL and PL spectra of 1–3 in CHCl 3 (10 Â 10
–5
M), (b) CPL and PL spectra of 2 and
4 in CHCl 3 (10 Â 10
–5
M)
40
Y. Morisaki