Metal Complexes with Amino Acid Amides. III. Geometrical Structures and Electronic Spectra of Bis(α-amino-acid-amidato)palladium(II), nickel(II) and Copper(II)

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概要

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• Square planar complexes of [ML<SUB>2</SUB>] type were synthesized, where M=Pd<SUP>2+</SUP> and Ni<SUP>2+</SUP> for L=L-valine-, L-phenylalanine- and L-proline-amidate anions, and M=Pd<SUP>2+</SUP>, Ni<SUP>2+</SUP> and Cu<SUP>2+</SUP> for L=L-leucinemethylamidate anion and for L<SUB>2</SUB>=trimethylenediamine-<I>N</I>,<I>N</I>′-diisobutyric acid amidate dianion; the last ligand is a tetradentate one and gives exclusively <I>cis</I> type complexes. <I>Cis</I> and <I>trans</I> isomers were isolated and identified for each of the L-valinamidato and the L-prolinamidato palladium complexes. All the other complexes were inferred to be <I>trans</I> isomers from examination of the electronic absorption and circular dichroism spectra. Common solvent effects of the ligand field bands were clearly observed between the <I>trans</I> palladium and <I>trans</I> nickel complexes. A similar empirical relationship was also found between the ligand field bands of the <I>trans</I> palladium complexes and those of the corresponding <I>cis</I> isomers. The spectral behavior of the bis(L-amino-acid-amidato)-copper(II) complexes was not so easily related to that of the corresponding nickel or palladium complexes. The ligand field bands of the palladium, nickel, and copper complexes were tentatively assigned.

• 公益社団法人 日本化学会の論文

著者

• Komorita Takashi

  Department Of Chemistry Faculty Of Science Osaka University

• Shimura Yoichi

  Department of Chemistry Faculty of Science Osaka University

• Hidaka Jinsai

  Department of Chemistry Faculty of Science Osaka University

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