Spectral Properties of Dyes with Interfragmental Charge Transfer: Solvatochromism and Solvatofluorochromism of 2-(3-Coumaroyl)-benzopyrylium Perchlorates
Table 3
Parameters of the solvents used#.
Solvent
Koppel-Palm parameters
Kamlet-Taft parameters
1
Dichloromethane
0.422
0.203
23
2.7
0.82
0.10
0.13
2
Chloroform
0.356
0.210
14
3.3
0.58
0.10
0.20
3
Dichloroethane-1,2
0.431
0.210
40
3.0
0.81
0.10
—
4
Diethyl ether
0.345
0.178
283
0.1
0.27
0.47
—
5
Tetrahydrofuran
0.407
0.198
287
0.0
0.58
0.55
—
6
Butanone
0.461
0.187
209
2.0
0.67
0.48
0.06
7
Acetone
0.465
0.180
224
2.1
0.71
0.43
0.08
8
Acetonitrile
0.480
0.175
160
5.2
0.75
0.40
0.19
9
Benzonitrile
0.471
0.236
155
2.2
0.90
0.37
—
10
Nitrobenzene
0.479
0.242
67
2.1
1.01
0.30
—
11
Methanol
0.477
0.169
218
10.6
0.60
0.66
0.98
12
Propanol-2
0.459
0.193
230
7.4
0.40
0.80
0.69
13
Butanol-2
0.407
0.198
231
7.1
0.60
0.55
—
14
Undecanol-1
0.384
0.209
242
10
0.45
0.82
0.70
Koppel-Palm parameters [9]: : polarity (Kirkwood constant), : polarisability, : basicity, and : electrophilicity. Kamlet-Taft parameters [10]: : polarity + polarisability, and : basicity and acidity, respectively.
