Polymorphism and magnetism of (cis -cyclohexane-1,4-diammonium) (dicyclohexano[18]crown-6)2[Ni(dmit)2]2 salts

Qiong Ye, Tomoyuki Akutagawa, Shin Ichiro Noro, Takayoshi Nakamura, Ren Gen Xiong

    研究成果: Article査読

    24 被引用数 (Scopus)

    抄録

    Supramolecular cationic structures of (CHDA2+)(DCH[18]crown-6) 2 were introduced into [Ni(dmit)2]- salts (where CHDA2+, DCH[18]crown-6, and dmit2- represent cis-cyclohexane-1,4-diammonium, meso-dicyclohexano[18]crown-6, and 2-thioxo-1,3-dithiole-4,5-dithiolate, respectively). The crystal polymorphs of (CHDA2+)(DCH[18]crown-6)2[Ni(dmit)2] 2 (crystals 1 and 2) within the same crystallization batch were classified in the space groups P21/n (1) and P1̄ (2). The N-H+∼O hydrogen-bonding interactions between the axial-and equatorial-ammonium moieties of the CHDA2+ cation and the oxygen atoms of DCH[18]crown-6 yielded a sandwich-type 1:2 adduct of the supramolecular cation in 1 and 2. Although the overall cationic structures in 1 and 2 resembled one another, the [Ni(dmit)2]- anion arrangements were distinctively different from each other. The lateral [Ni(dmit) 2]- dimer along the short axis of the anion was observed in 1, whereas two types of [Ni(dmit)2]- π-dimer existed independently in 2. The weak intermolecular interactions between the [Ni(dmit)2]- anions in 1 was reflected by the temperature dependent magnetic susceptibility, which followed the Curie-Weiss model. For 2, two different magnetic exchange energies arising from the different strengths of the π-dimer units dominated the magnetic properties.

    本文言語English
    ページ(範囲)4856-4860
    ページ数5
    ジャーナルCrystal Growth and Design
    10
    11
    DOI
    出版ステータスPublished - 2010 11月 3

    ASJC Scopus subject areas

    • 化学 (全般)
    • 材料科学(全般)
    • 凝縮系物理学

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