Table 2.

Photophysical properties of macrocycles 4T‐PBI, 5T‐PBI, ^[16] 6T‐PBI and 7T‐PBI in solution (CH₂Cl₂ and cyclohexane) at room temperature.

	4T‐PBI	5T‐PBI [16]	6T‐PBI	7T‐PBI
λ abs,max [a] [nm]	533	531	531	529
ϵ max [a] [103 M−1 cm−1]	67.5	64.8	67.2	69.2
λ abs,max [b] [nm]	522	519	519	564
λ em,max [b,c] [nm]	530	523	533	527
λ em,max [b,d] [nm]	530	523	527	527
$\Delta {\tilde{\nu }}_{\mathrm{Stokes}}$ [b] [cm−1]	218	329	220	221
Φ fl [b], [e] [%]	<1.0	<1.0	<1.0	<1.0

[a] CH₂Cl₂, c ₀=10⁻⁵ M. [b] Cyclohexane, c ₀=10⁻⁷ M. [c] λ _ex=350 nm. [d] λ _ex=480 nm. [e] The fluorescence quantum yields of the PBI subunit were measured relative to N,N′‐bis(2,6‐diisopropylphenyl)‐1,6,7,12‐tetraphenoxy‐perylene‐3,4 : 9,10‐bis(dicarboximide) as a reference ^[27] at four different excitation wavelengths in the spectral region of the PBI subunit.