66
2 Molecular States
Fig. 2.9 Vertical transition energies π → π ∗ in conjugated systems, from absorption maxima. Simple polyenes, H(CH=CH) nc H; diphenylpolyenes, Ph-(CH=CH) nc -Ph; aldehydes, CH 3 -
(CH=CH) nc−1 -CHO; carboxylic acids, CH 3 -(CH=CH) nc−1 -COOH. For aldehydes with n c = 1-3,
the n → π ∗ transition is shown as well. Data from [20]
Table 2.2 Photophysical properties of selected aromatic compounds in solution. τ S is the singlet
lifetime. Φ F and Φ T are the fluorescence and triplet quantum yields, respectively. Data from [21,
22]
Molecule
τ S (ns)
Φ F
Φ T
Benzene
34
0.06
0.25
Naphthalene
96
0.19
0.75
Anthracene
6
0.27
0.71
Phenanthrene
57
0.14
0.73
Pyrene
650
0.65
0.37
Chrysene
45
0.12
0.85
Tetracene
6
0.17
0.62
2 Molecular States
Fig. 2.9 Vertical transition energies π → π ∗ in conjugated systems, from absorption maxima. Simple polyenes, H(CH=CH) nc H; diphenylpolyenes, Ph-(CH=CH) nc -Ph; aldehydes, CH 3 -
(CH=CH) nc−1 -CHO; carboxylic acids, CH 3 -(CH=CH) nc−1 -COOH. For aldehydes with n c = 1-3,
the n → π ∗ transition is shown as well. Data from [20]
Table 2.2 Photophysical properties of selected aromatic compounds in solution. τ S is the singlet
lifetime. Φ F and Φ T are the fluorescence and triplet quantum yields, respectively. Data from [21,
22]
Molecule
τ S (ns)
Φ F
Φ T
Benzene
34
0.06
0.25
Naphthalene
96
0.19
0.75
Anthracene
6
0.27
0.71
Phenanthrene
57
0.14
0.73
Pyrene
650
0.65
0.37
Chrysene
45
0.12
0.85
Tetracene
6
0.17
0.62