Table 4. Photophysical Characterization Data for the Probe.

compounda	quantum yieldb	λex (nm)	λem (nm)	UV–vis absorption λabs (nm)	DRc
probe	0.066	380	570	267, 380	4.24
probe + CN–	0.28	380	570	267, 380

^a20 μM probe in CH₃CN/H₂O (v/v = 95:5) at 298 K.

^bRelative fluorescence quantum yield (9,10-iphenylanthracene; Φ = 0.9).

^cDynamic range: DR = Φ/Φ₀; Φ and Φ₀ are the fluorescence quantum yields of the probe-CN^– and probe-free.