Table 1.

Photophysical properties of chalcones: CA, IBC, XN, LIC and HCH (1 μM) in different solvents and MeOH:H₂O mixtures.

Compound	Solvent	$\mathit{\lambda }$ [nm] a	I b	$\mathsf{\Phi }$F c	$\mathsf{\Phi }$F [%]
LIC	Chloroform	340	1217.45	0.017	1.67%
	H2O	360	4492.32	0.049	4.94%
	MeOH	360	13,591.67	0.149	14.92%
	Ethylene glycol	364	39,790.82	0.504	50.43%
	1:9 (90% H2O)	362	6399.15	0.070	7.01%
	5:5 (50% H2O)	362	13,691.85	0.151	15.14%
	9:1 (10% H2O)	362	13,124.63	0.144	14.36%
CA	Chloroform	323	221.22	0.003	0.32%
	H2O	337	907.41	0.011	1.07%
	MeOH	322	143.06	0.002	0.18%
	Ethylene glycol	328	504.93	0.007	0.71%
	1:9 (90% H2O)	332	487.63	0.006	0.58%
	5:5 (50% H2O)	328	195.08	0.002	0.24%
	9:1 (10% H2O)	323	229.40	0.003	0.28%
IBC	Chloroform	347	489.47	0.007	0.66%
	H2O	351	93.26	0.001	0.11%
	MeOH	347	335.02	0.004	0.38%
	Ethylene glycol	353	761.5321	0.010	1.00%
	1:9 (90% H2O)	353	156.8975	0.002	0.18%
	5:5 (50% H2O)	353	223.9067	0.003	0.25%
	9:1 (10% H2O)	350	298.9348	0.003	0.34%
XN	Chloroform	346	117.50	0.002	0.16%
	H2O	348	332.82	0.004	0.40%
	MeOH	348	64.58	0.001	0.07%
	Ethylene glycol	353	339.84	0.004	0.44%
	1:9 (90% H2O)	355	220.20	0.002	0.25%
	5:5 (50% H2O)	351	147.85	0.002	0.17%
	9:1 (10% H2O)	351	147.02	0.002	0.17%
HCH	Chloroform	345	31.30	0.000	0.04%
	H2O	350	764.23	0.009	0.86%
	MeOH	343	40.77	0.000	0.05%
	Ethylene glycol	348	397.70	0.005	0.53%
	1:9 (90% H2O)	348	180.46	0.002	0.21%
	5:5 (50% H2O)	348	190.35	0.002	0.22%
	9:1 (10% H2O)	344	168.18	0.002	0.19%

^a λ_em—emission maximum wavelength (excited at the maximum absorption wavelength), ^b I—area under the emission curve, ^c $\mathsf{\Phi }$_F—fluorescence quantum yields calculated using 7-diethylamino-4-methylcoumarin (coumarin1) in ethanol as the standard (Φ_f = 0.73) [45].