Table 2 One- and two-photon photophysical parameters of R-iLACCO1

Relative fraction of neutral chromophore (ρ_N)

0.95

0.39

0.88

0.35

0.94^b

0.18^b

0.17^c

Relative fraction of anionic chromophore (ρ_A)

N/A

0.61

0.12

0.65

0.06^b

0.82^b

0.83^c

Neutral extinction coefficient (mM⁻¹ cm⁻¹, ε_N)

36

55

29

N/A

33

30

N/A

Anionic extinction coefficient (mM⁻¹ cm⁻¹, ε_A)

84

88

13

59

89

69

75

Neutral quantum yield (φ_N)

N/A

N/A

N/A

N/A

N/A

N/A

N/A

Anionic quantum yield (φ_A)

0.17

0.21

0.11

0.28

0.15

0.21

0.46

Molecular brightness (ρ_A × ε_A × φ_A)

N/A

11.3

0.17

10.7

0.80

12

28.6

Neutral one-photon absorbance peak (nm)

444

447

444

ND

N/A

N/A

N/A

Anionic one-photon absorbance peak (nm)

579

561

578

567

577

563

N/A

Two-photon cross section (GM) (position/nm)

28 (1080)

72 (1048)

35 (1080) 236 (740)

51 (1060) 125 (740)

24 (1072)

31 (1056)

N/A

Two-photon brightness F₂ (GM) (position/nm)

N/A

9.2 (1048)

0.46 (1080) 3.1 (740)

9.3 (1060) 23 (740)

0.21 (1072)

5 (1056)

N/A