• P-ISSN1225-0163
  • E-ISSN2288-8985
  • SCOPUS, ESCI, KCI

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  • P-ISSN 1225-0163
  • E-ISSN 2288-8985

Article Contents

    A Complexation Study of Novel Triaza and Hexaaza Macrocycles for the Use of Analytical Reagents

    Analytical Science and Technology / Analytical Science and Technology, (P)1225-0163; (E)2288-8985
    1995, v.8 no.4, pp.449-456
    Wakita, Hisanobu
    Yamaguchi, Toshio
    Matsuki, Yuuichi
    Kurisaki, Tsutomu
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    Abstract

    Novel macrocyclic ligands modified with pendant arms, N, N', N'', N''', N'''', N'''''-hexakis(2-aminoethyl)-1, 4, 7, 10, 13, 16-hexaazacyclootadecane [<TEX>$L_3$</TEX>, Fig.1] and 1, 4, 7-tris(3-(o-hydroxyphenyl)propyl)-1, 4, 7-triazacyclononane [<TEX>$L_4$</TEX>, Fig.1] have been synthesized, and the protonation of <TEX>$L_3$</TEX> and <TEX>$L_4$</TEX> and stability constants of <TEX>$L_3$</TEX> with bivalent transition metal ions and rare earth metal ions were determined by a potentiometry. The obtained results show that the complex formation of <TEX>$L_3$</TEX> depends on the metal ligand ratios, and the stability of the metal complexes does not depend on the sizes of the metal ions, but on the nature of the metal ions. The structures of the rare earth complexes for <TEX>$L_4$</TEX> were characterized by an X-ray absorption spectrometry(XAFS).

    keywords
    Appended Triaza Macrocycles, Appended Hexaaza Macrocycles, Complex Formation, Potentiometry, XAFS


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