Preparation and properties of complexes of lanthanides with a hexadentate nitrogen-donor macrocycle: X-ray crystal structure of the complex [La(NO3)3l]

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Abstract
The template condensation of 2,6-diacetyl-pyridine with ethylenediamine gives complexes [M(NO3)3L](M = La or Ce) of the hexadentate nitrogen donor macrocycle L; the structure of [La(NO3)3L] has been determined by X-ray diffraction, and the complexes, whose 1H n.m.r. spectra are described, are kinetically stable in water with respect to dissociation of the macrocycle.