Spectrophotometric Studies on the Reaction of Diaveridine with Some Sulfonphthalein Dyes Based on Ion-Pair/Ion-Associate Complexes Formation

Table 3

Association constant and free energy (ΔG°) obtained from the molar ratio and continuous variation method of ion-associate complexes under investigation.

Ion pair	log Kf		ΔG° (Kcal)
	log Kf1 (1 : 1)	log Kf2 (1 : 2)	ΔG°1 (1 : 1)	ΔG°2 (1 : 2)
D-I	4.72	10.74	−6.4365	−14.64580
D-II	4.89	10.91	−6.6683	−14.87750
D-III	4.60	10.62	−6.2729	−14.48213
D-IV	4.70	10.71	−6.4098	−14.60004
D-V	4.72	10.81	−6.4371	−14.7410
D-VI	4.63	10.66	−6.3137	−14.53670
D-VII	4.62	10.61	−6.3001	−14.46850
D-VIII	4.54	9.95	−6.1912	−13.56847