Abstract
The complex formed between LaCl 3·7H 2O and the macrocyclic ligand 18-crown-6 (18C6) in methanol has been characterized by 139La NMR. Two sites in very slow exchange on the 139La NMR chemical shift time scale coexist in methanolic solutions: solvated and 1 : 1 complexed 139La III. Both chemical shift and relaxation rate data point to the participation of the chloride counteranion and of the crown ether in the first coordination sphere of lanthanum(III). The equilibrium constant of formation of the complex, determined from the populations of the two 139La NMR sites, is in excellent agreement with previously determined data from the literature.
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