Mixed Ligand Complex Formation between Monodentate Ligands and Various Tridentate Ligand-Copper(II) Complexes
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概要
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Formation of mixed ligand complexes between monodentate ligands (L) and copper(II) complexes of tridentate ligands (A) has been investigated by potentiometric titration and thermal analysis. Thus, the constants, log<I>K</I><SUB>m</SUB>, for the formation of the complexes of type CuA·L from CuA and L have been calculated from the titration curves by the method of non-linear least-squares. A refers to diethylenetriamine, dipicolylamine, 2,2′,2″-terpyridine, ethylenediamine-<I>N</I>-monoacetic acid, iminodiacetic acid, or pyridine-2,6-dicarboxylic acid and L to pyridine, <I>p</I>-phenolsulfonic acid, <I>n</I>-butylamine, or hydroxy group. The stability series in each system with L fixed has been interpreted in terms of the strength of A as a Lewis base, expressed by the sum of p<I>K</I><SUB>a</SUB> (Σp<I>K</I><SUB>a</SUB>), as well as back-donation. In the absence of significant steric hindrance, favorable combination of donor atoms around copper(II) has been found to be between aromatic nitrogens and negative oxygens. Thermal stability of the isolated complexes of type CuA·PY, where PY is pyridine, was also in line with the stability sequence in solution.
- 公益社団法人 日本化学会の論文
著者
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Nakahara Akitsugu
Institute of Chemistry, College of General Education, Osaka University
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Nakahara Akitsugu
Institute Of Chemistry College Of General Education Osaka University
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Yamauchi Osamu
Institute of Chemistry, College of General Education, Osaka University
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Benno Hiroshi
Institute of Chemistry, College of General Education, Osaka University
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