Speciation Studies of Diorganotin(IV) Complexes with 3,3-Bis(1-methylimidazol-2-yl)propionate—Displacement Reaction by DNA Constituents

Table 1

Formation constants of organotin(IV) complexes with 3,3-bis(1-methylimidazol-2-yl)propionate in water for DMT and in 50% (v/v) dioxane-water solution for DBT and DPT, at 25°C and 0.1 M ionic strength.

Organotin(IV)	𝑝^a	𝑞^a	𝑟^a	logβ ^b
DMT	0	1	1	7.11 (0.01)
	0	1	2	11.31 (0.02)
	0	1	3	13.49 (0.03)
	1	0	−1	−3.39 (0.01)
	1	0	−2	−8.99 (0.01)
	1	0	−3	−19.83 (0.01)
	1	0	−4	−31.30 (0.01)
	2	0	−2	−3.92 (0.01)
	1	1	0	9.47 (0.02)
	1	2	0	14.78 (0.11)
	1	1	−1	4.70 (0.11)
DBT	0	1	1	6.66 (0.01)
	0	1	2	10.98 (0.02)
	0	1	3	14.43 (0.02)
	1	0	−1	−4.39 (0.01)
	1	0	−2	−15.05 (0.02)
	2	0	−1	−1.41 (0.04)
	1	1	0	10.56 (0.06)
	1	2	0	14.72 (0.09)
DPT	0	1	1	6.66 (0.01)
	0	1	2	10.98 (0.02)
	0	1	3	14.43 (0.02)
	1	0	−1	−2.82 (0.10)
	1	0	−2	−13.58 (0.10)
	2	0	−1	2.07 (0.10)
	1	1	0	11.43 (0.03)
	1	2	0	15.87 (0.04)

aThe p, q, and r are the stoichiometric coefficients corresponding to organotin(IV), 3,3-bis(1-methylimidazol-2-yl)propionate, and H⁺, respectively; ^bStandard deviations are given in parentheses.