Table 5. Photophysical Properties of Biaryl Derivatives 6a–d.

entry	product	absorptionaλmax,abs (nm)	emissiona λmax,emi (nm)	molar extinction coefficient × 104 (ε) π–π*	Stoke’s shift Δν̅ (cm–1)b	quantum yield (Φf)c
1	6a	256, 334	367	2.0435	11 814	0.1676
2	6b	257, 328	371	5.0952	11 956	0.1212
3	6c	276	380	4.5657	9916	0.1755
4	6d	276	380	6.0996	9916	0.0359

^aRecorded in MeOH at 298 K.

^bStoke’s shift = λ_max,abs – λ_max,emi [cm ^–1].

^cDetermined with anthracene as a standard Φ_f = 0.27 at an excitation wavelength of 246 nm.