Synthesis and Characterization of Trivalent Cerium Complexes of p-tert-Butylcalix[4,6,8]Arenes: Effect of Organic Solvents

Table 1

Computed molar extinction coefficients of complexes 1, 2, and 3 in various organic solvents at 25°C.

Organic solvent	1 (10^4 mol^−1 dm^2)	2 (10^4 mol^−1 dm^2)	3 (10^4 mol^−1 dm^2)
Polar protic
Methyl alcohol	5.59	6.59	6.40
Ethyl alcohol	5.11	6.07	5.87
n-Amyl alcohol	4.27	2.34	2.10
n-Butyl alcohol	4.00	3.00	2.90
n-Propanol	3.10	2.65	2.40
Methyl isobutyl ketone	0.80	0.50	0.50
Polar aprotic
Acetonitrile	3.54	2.67	2.57
Hexamethylphosphoric triamide	2.47	0.67	0.59
Dimethyl sulfoxide	3.14	1.70	1.60
Acetone	3.40	1.90	1.80
1–4 Dioxane	2.00	2.04	1.99
Nonpolar
Benzene	2.47	1.87	1.77
Chloroform	2.60	1.74	1.74
Carbon tetrachloride	0.42	0.34	0.32
Other solvents
Benzonitrile	2.14	1.89	1.79
Dioctyl phthalate	1.00	0.86	0.75