e00025 Table 2.

Table 2. The logarithms of the equilibrium constants and the chemical shifts of complex formation between 18-crown-6 and СаСl₂ и Са(NО₃)₂ in water

CaX₂

С⁰CaX₂

mol/L

chem. shift d_к, ppm

lgK,

L /mol

R-factor, %

Ca(NO₃)₂

0,2

-33.4 ± 1.6

0.95 ±0.08

1.58

0,3

-35.2 ± 1.3

0.92 ± 0.07

1.19

0,5

-38.7 ± 0.9

0.73 ± 0.05

0.78

CaCl₂

0,2

-38.2 ± 1.1

0.75 ± 0.05

1.35

0,5

-36.3 ± 1.4

0.87 ± 0.08

1.10

CaX₂	С⁰CaX₂ *mol/L*	chem. shift d_к, ppm	lgK, L /mol	R-factor, %
Ca(NO₃)₂	0,2	-33.4 ± 1.6	0.95 ±0.08	1.58
	0,3	-35.2 ± 1.3	0.92 ± 0.07	1.19
	0,5	-38.7 ± 0.9	0.73 ± 0.05	0.78
CaCl₂	0,2	-38.2 ± 1.1	0.75 ± 0.05	1.35
CaCl₂	0,5	-36.3 ± 1.4	0.87 ± 0.08	1.10