Properties of monovalent nickel complexes with tetraaza-macrocyclic ligands in aqueous solutions

Israel Zilbermann, Maya Winnik, Dalia Sagiv, Amira Rotman, Haim Cohen, Dan Meyerstein

פרסום מחקרי: פרסום בכתב עתמאמרביקורת עמיתים

29 ציטוטים ‏(Scopus)

תקציר

The effects of N-alkylation on the redox potential of the couples NiLi2+/NiLi+, L = tetraaza-14-membered-macrocyclic ligands, and on the properties of the monovalent nickel complexes in aqueous solutions are reported for 14 complexes. The spectra and lifetimes of the NiLi+ complexes are reported. The self-exchange rates for the couples NiLi2+/NiLi+ were determined. Two of the ligands were synthesized for the first time for this study. Cyclic voltammetry and pulse radiolysis were used. The results point out that: (i) N-alkylation always shifts the redox potential to a less cathodic one; this effect stems to a large degree from the decrease in the solvation energy of the complex caused by the N-alkylation of the ligand. (ii). The lifetime of the monovalent complexes is not linearly related to the redox potential of the NiLi2+/NiLi+ couples. (iii) The NiLi+ complexes exist in several isomeric forms; the rate of the isomerization depends on the structure of the ligand. (iv) Different isomers of NiLi+ may be formed when the complex NiLi2+ is reduced by different reagents; therefore, the pulse-radiolytically formed NiLi+ complexes might have different properties than those formed electrochemically.

שפה מקוריתאנגלית
עמודים (מ-עד)503-514
מספר עמודים12
כתב עתInorganica Chimica Acta
כרך240
מספר גיליון1-2
מזהי עצם דיגיטלי (DOIs)
סטטוס פרסוםפורסם - דצמ׳ 1995
פורסם באופן חיצוניכן

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