Steric-Hindrance Effect of a Substituent in the Self-Assembly Process of Copper(II) Complexes with Quadridentate Schiff-Base Ligands Involving a 2-Substituted-Imidazole Moiety

• Naohide Matsumoto

  Department of Chemistry, Faculty of Science, Kumamoto UniversityKurokami 2-39-1, Kumamoto 860

• Masaaki Mimura

  Department of Chemistry, Faculty of Science, Kumamoto UniversityKurokami 2-39-1, Kumamoto 860

• Yukinari Sunatsuki

  Department of Chemistry, Faculty of Science, Kumamoto UniversityKurokami 2-39-1, Kumamoto 860

• Shingo Eguchi

  Department of Chemistry, Faculty of Science, Kyushu UniversityHakozaki, Higashi-ku, Fukuoka 812

• Yukiko Mizuguchi

  Department of Chemistry, Faculty of Science, Kyushu UniversityHakozaki, Higashi-ku, Fukuoka 812

• Hitoshi Miyasaka

  Department of Chemistry, Faculty of Science, Kyushu UniversityHakozaki, Higashi-ku, Fukuoka 812

• Toshio Nakashima

  Faculty of Education, Oita UniversityDannoharu 700, Oita 870-11

抄録

Four copper(II) complexes with unsymmetrical quadridentate ligands involving an imidazole moiety, [CuHLn]ClO4 (1—4; n = 1—4), have been prepared and characterized, where HL1 = N-salicylidene-N′-(2-methylimidazol-4-ylmethylidene)-1,3-propanediamine, HL2 = N-salicylidene-N′-(2-phenylimidazol-4-ylmethylidene)-1,3-propanediamine, HL3 = N-acetylacetonylidene-N′-(2-methylimidazol-4-ylmethylidene)ethylenediamine, HL4 = N-acetylacetonylidene-N′-(2-phenylimidazol-4-ylmethylidene)ethylenediamine, respectively. The corresponding deprotonated complexes 1′—4′ were obtained when 1—4 were treated under an alkaline condition. Deprotonation of the imidazole moiety of the copper(II) complex motivates a self-assembly process which is formed by an axial coordination of the imidazolate nitrogen atom of a molecular unit to the copper(II) ion of another unit. 1′—3′ assumes a self-assembled imidazolate-bridged infinite-chain structure {Cu(II)–Im}n in the solid state, while the polymeric species dissociates to monomeric species in the solution state. 4′ consists of a discrete deprotonated monomeric species, even in the solid state. The physical measurements, including reflectance and absorption spectra, cryomagnetic measurements, and single-crystal X-ray analyses, revealed that the self-assembly behavior for the series of copper(II) complexes depends both on the steric effect of the substituent of 2-substituted-4-formylimidazole moiety and the ligand field strength of the equatorial quadridentate ligand.

収録刊行物

• Bulletin of the Chemical Society of Japan

  Bulletin of the Chemical Society of Japan 70 (10), 2461-2472, 1997-10-01

  Oxford University Press (OUP)

キーワード

• General Chemistry

詳細情報

• CRID: 1360846644034553088
• NII論文ID: 130004149680
• DOI: 10.1246/bcsj.70.2461
• ISSN: 13480634
• ISSN: 00092673
• Web Site: https://academic.oup.com/bcsj/article-pdf/70/10/2461/56197992/bcsj.70.2461.pdf
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