Table 2. The ESIPT efficiencies from the SN1 state (x) and from the SNn state (y) upon excitations with higher energy photons.

Compound	Excitation wavelength/nm	ESIPT efficiency a (%)
		x	y
3-HTCA	300	55.1	61.1
	350	36.6	78.3
3-HTC-DiCN	300	3.8	30.9
	350	2.5	10.3

^a x and y are the ESIPT efficiency (%) for S₁ and S_n states, respectively (see Fig. 9).