A ⁹Be NMR STUDY ON THE COORDINATION STRUCTURES OF Be²⁺ COMPLEXES WITH CYCLO-μ-IMIDOTRIPHOSPHATE ANIONS (I)

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Be²⁺ ion coordination to cyclic imidotriphosphate ligands, cyclo-μ-triimidotriphosphate, cP₃(NH)₃, has been studied by a ⁹Be NMR technique in order to clarify the coordination structures of the complexes. The NMR spectra indicate the presence of monodentate complexes coordinated with oxygen or nitrogen atoms. It seems that electron-crowded donor nitrogen atoms in the ring center of cP₃(NH)₃ molecule form a specific binding site for Be²⁺ ions, which allows Be²⁺ ions to coordinate directly to nitrogen atoms.