Abstract
Macroscopic and microscopic complexation behaviors of Be2+ ions with cyclic imidotriphosphate ligands, involving P-O-P and/or P-NH-P linkages, i.e., cyclo-μ-monoimidotriphosphate, cP3(NH), cyclo-μ-diimidotriphosphate, cP3(NH)2, and cyclo-μ-triimidotriphosphate, cP3(NH)3, anions have been investigated by a 9Be NMR technique. The stability constants of monodentate and bidentate complexes, as well as those of oxygen-coordination and nitrogen-coordination complexes have been determined by the peak area ratio calculation of the 9 Be NMR spectra. The stability constants of oxygen-coordination and nitrogen-coordination monodentate complexes increase in the order of cP3(NH) < cP3(NH)2 < cP3(NH)3. However, the magnitude of the increase is much more pronounced in the case of the stability constants of nitrogen-coordination monodentate complexes, since the number of binding nitrogen atoms in the ligand molecules increases with the same order.
