- 作者: Min-Shiun Chao, Chang-Fang Ou and Shih-Liang Huang
- 中文摘要: In order to study the steric, inductive, and ring-strain effects of diamino diamides on the equilibrium and spectral properties of nickel(II)-diamino diamides complexes, four tetradentate ligands, 4-methyl-4,7-diazadecanediamide(4-Me-L-2,2,2), 4,7-dimethyl-4,7-diazadecanediamide(4,7-N,N¢-Me2-L-2,2,2), 4-ethyl-4,7-diazadecanediamide (4-Et-L-2,2,2), and 4-methyl-4,8-diazaundecanediamide (4-Me-L-2,3,2), have been synthesized. Their protonation constants have been determined potentiometrically in 0.1M KCl at 25.0 °C The formation of their nickel(II)-complexes and the Ni-O to Ni-N bond rearrangements at the two amide sites of these complexes have been investigated quantitatively by potentiometric and spectrophotometric techniques under the same conditions. Electronic spectra of the nickel(II)-complexes of these ligands and their deprotonated species formed in aqueous solution were measured and discussed.
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