Antiferromagnetic spin-exchange interaction in mixed-spin trinuclear cobalt(II) complexes with quadridentate schiff bases.
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概要
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Trinuclear cobalt(II) complexes, [Co(R<SUB>1</SUB>R<SUB>2</SUB>-L)]<SUB>2</SUB>CoX<SUB>2</SUB> (R<SUB>1</SUB> R<SUB>2</SUB>=H, Me; L=en, ch, ph; X=Cl<SUP>−</SUP>, Br<SUP>−</SUP>), have been synthesized, where H<SUB>2</SUB>(R<SUB>1</SUB>,R<SUB>2</SUB>-L) denotes the Schiff bases obtained by condensing a 5(R<SUB>1</SUB>), α(R<SUB>2</SUB>)-substituted salicylaldehyde with a diamine (H<SUB>2</SUB>N-L-NH<SUB>2</SUB>) in a 2:1 mole ratio. From IR spectra and cryomagnetic properties, it was concluded that these complexes are in mixed-spin state of a Co(II)(<I>s</I>=l/2)-Co(II)(<I>s</I>=3/2)–Co(II)(<I>s</I>=l/2) system, strong antiferromagnetic spin-exchange interaction operating between low-spin and high-spin cobalt(II) ion <I>via</I> d<SUB>π</SUB>(low-spin Co)-p<SUB>π</SUB>(O)-d<SUB>π</SUB>(high-spin Co) super pathway.
- 公益社団法人 日本化学会の論文
著者
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Okawa Hisashi
Department Of Chemistry Faculty Of Science Kyushu University
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Kida Sigeo
Department of Chemistry Wakayama University
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Kasempimolporn Visit
Department of Chemistry, Faculty of Science, Kyushu University
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