Co2+, Ni2+ and Cu2+ complexes with phosphorylated derivatives of cyclen and diaza-18-crown-6: Effect of anion on the structure of complexes and their stability in solutionстатья
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Аннотация:The effect of counterion A on the solid-state molecular structures and stability constants in solution for the complexes of the MA2 salts (M = Co2+, Ni2+, Cu2+, A = ClO4-, NCS-, NO3–) with phosphorylated cyclen and diaza-18-crown-6 derivatives has been studied. The synthesis, X-ray diffraction study, IR, and electronic absorption spectra of the complexes have been reported. The solid-state molecular structure of eight new complexes has been determined. The stability constants of the cobalt(II) complexes with 1,4,7,10-tetrakis[(diphenylphosphoryl)methyl]-1,4,7,10‑tetraazacyclododecane (L1) in acetonitrile have been estimated. A significant influence of the counterion of MA2 salt on the structure and stability of the complexes has been found. Salt anion affects both the number of formed complexes and the value of the stability constant of the complexes.
