8
10 –4
e / M –1
cm –1
10 –4
e / M –1
cm –1
Δe / M –1
cm –1
l / nm
l / nm
Δe / M –1
cm –1
Δl / a.u.
Δl / a.u.
l / a.u.
l / a.u.
1
0.8
0.6
0.4
0.2
Abs
ECD (aS)
ECD (aS )
CPL (aS)
CPL (aS)
ECD (aR)
ECD (aR)
CPL (aR)
CPL (aR )
Abs
Flu
Flu
0
1
0.8
0.6
0.4
0.2
0
6 10
–4
4 10
–4
2 10
–4
–2 10
–4
–4 10
–4
–6 10
–4
0
6 10
–3
4 10
–3
2 10
–3
–2 10
–3
–4 10
–3
–6 10
–3
0
7
6
5
4
3
2
1
0
8
7
6
5
4
3
2
1
0
750
500
250
–250
–500
–750
0
40
20
0
–20
–40
300
400
500
600
700
300
400
500
600
700
Fig. 6.25 Experimental UV-Vis absorption and fluorescence spectra (top), CD and CPL spectra
(bottom) for axially chiral 1,1
0 -linked bis(BODIPY) 34 (left), and axially chiral 3,3
0 -linked bis
(BODIPY) 35 (right) [reproduced with permission from [60], copyright 2016 WILEY-VCH Verlag
GmbH]
N B
N
N
B
N
NH
NH
Cl
Cl
F F
F
F
(R,R)-36
R
R
N B
N
N
B
N
NH
NH
Cl
Cl
F F
F
F
S
S
(S,S)-36
g lum = +1·10 -3
f = 0.14
g lum = -1·10 -3
f = 0.14
Fig. 6.26 Helically labile bis(haloBODIPY)s (R,R)- and (S,S)-36 and their visible CPL signatures
upon visible light irradiation in solution
138
M. J. Hall and S. de la Moya