Benzo[]coumarin-Based Fluorescent Probes for Bioimaging Applications

Table 2

Photophysical properties of pyridinium-benzo[]coumarin derivatives (33–42).

Compound	λabs (nm)	λemi (nm)	Brightness	GM
33	n.r.	n.r.	n.r.	n.r.
34	n.r.	n.r.	n.r.	n.r.
35	445	585	n.r.	n.r.
36	n.r.	n.r.	n.r.	n.r.
37	n.r.	n.r.	n.r.	n.r.
38	506	663	749	n.d.
39	499	660	510	n.d.
40	513	681	2089	n.d.
41	511	680	1173	150
42	527	691	799	160

The wavelengths, brightness, and GM values are derived from the highest intensity values in the absorption and fluorescence emission spectra. Brightness: molar extinction coefficient (LMol⁻¹·cm⁻¹) × quantum yield (Φ_F); GM: two-photon absorption cross section (TPACS, Goeppert-Mayer unit); n.r.: not reported; n.d.: not determined.