Аннотация:At 298.15 K, the heats of soln. of Ca(NO3)2, CaCl2, 18-crown-6, and their complexes indicate that Ca2+ is complexed appreciably by 18-crown-6 in soln. In EtOH, the heats of complexation are CaCl2 -35.48 В± 0.52 and Ca(NO3)2 -21.44 В± 0.23 kJ mol-1.