Table 2. Photophysical properties of the pA nucleoside monomer (1) in different solvents.

Solvent	λ Abs,1 (nm)	ε 1 (M–1 cm–1)	λ Abs,2 (nm)	ε 2 (M–1 cm–1)	λ Em (nm)	Φ F (%)	ε 1 Φ F a (M–1 cm–1)
Water b	387	15 200	368	11 400	420	66	10 100
DMSO	396	17 100	378	12 500	421	84	14 400
EtOH	390	17 500	370	12 600	405	66	11 600
DCM	392	16 100	373	11 700	410	74	11 900
Toluene	397	18 700	377	13 200	409	72	13 400
MeCN	390	16 500	372	11 900	414	64	10 500

^aBrightness is calculated as the product of the fluorescence quantum yield (Φ_F) and the molar absorptivity at the long-wavelength maximum (ε₁).

^bWith 2% DMSO.