Table 1.

Photophysical properties of p-cyanophenylalanine (Phe_CN) in different solvents. The Kamlet-Taft α parameters are adopted from reference 14.

Solvent	α	Components	%	τ(ns)a	QYb	kr (s−1)	knr (s−1)	χ2
tetrahydrofuran	0	2	93	3.9	3.1 × 10−2	7.9 × 106	2.5 × 108	1.26
			7	0.4
acetonitrile	0.19	2	85	4.2	2.6 × 10−2	6.2 × 106	2.3 × 108	1.02
			15	1.1
formamide	0	2	94	4.8	8.3 × 10−2	1.7 × 107	1.9 × 108	1.07
			6	0.5
1,2 propane diol	0.83	2	84	4.9	1.0 × 10−1	2.1 × 107	1.8 × 108	1.10
			16	1.0
2-propanol	0.76	1	100	4.0	7.1 × 10−2	1.8 × 107	2.3 × 108	1.16
1-propanol	0.84	1	100	4.4	7.4 × 10−2	1.7 × 107	2.1 × 108	1.16
1-butanol	0.84	1	100	4.6	7.9 × 10−2	1.7 × 107	2.0 × 108	1.14
ethanol	0.86	1	100	4.1	3.4 × 10−2	8.5 × 106	2.4 × 108	1.14
methanol	0.98	1	100	6.1	7.6 × 10−2	1.2 × 107	1.5 × 108	1.13
water	1.17	1	100	7.0	1.1 × 10−1	1.6 × 107	1.3 × 108	1.04
formic acid	1.23	1	100	8.1	1.7 × 10−1	2.1 × 107	1.0 × 108	1.05

^aThe percent error in these values was estimated to be about ±5%.

^bThe percent error in these values was estimated to be about ±10%.