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. 2019 Nov 12;15:2684–2703. doi: 10.3762/bjoc.15.262

Table 7.

Photophysical properties of 1H-pyridines 8.

Compound R1 R2 λmax,abs [nm]a (ε [L·mol−1·cm−1]) λmax,em [nm]b (Φf)c Stokes shift Δ ν̃ [cm−1]
8a Ph Ph 274 (20300), 324 (20100), 417 (7700) 557 (<0.01) 6000
8b p-MeOC6H4 Ph 261 (16200), 307 (31300), 419 (11000) 565 (<0.01) 6200

aRecorded in dichloromethane, T = 293 K, c(8) = 10−6 M; brecorded in dichloromethane, T = 293 K, c(8) = 10−7 M (λexc = 420 nm); cfluorescence quantum yields were determined relative to coumarin153 (Φf = 0.54) as a standard in ethanol [58].