Flexible cis-cyclohexane-1,4-diammonium ion in magnetic [Ni(dmit) 2] crystals

Qiong Ye, Ping Ping Shi, Zi Qi Chen, Tomoyuki Akutagawa, Shin Ichiro Noro, Takayoshi Nakamura

Research output: Contribution to journalArticlepeer-review

14 Citations (Scopus)


Reactions exchanging the cation in (nBu4N)[Ni(dmit)2] to cis-cyclohexane-1,4-diammonium (cis-CHDA) in the presence of [18]crown-6, benzo[18]crown-6 (B[18]crown-6) and dibenzo[18]crown-6 (DB[18]crown-6) yielded crystals of the monovalent [Ni(dmit)2] complex, namely (cis-CHDA)([18]crown-6)2[Ni(dmit)2]2 (1), (cis-CHDA)(B[18]crown-6)2[Ni(dmit)2]2 (2) and (cis-CHDA)(DB[18]crown-6)2[Ni(dmit)2]2 (3). The two ammonium groups (-NH3+) of the cis-CHDA dication at axial and equatorial positions interact with oxygen atoms of the corresponding upper and lower crown ethers to form sandwich-type supramolecular cationic structures. The lateral [Ni(dmit)2]- anion arrangements through S-S contacts along the short and long axis of [Ni(dmit)2] anions were realised in crystals of 1, 2, and 3 by the asymmetrical cis-CHDA dication. The temperature- and frequency-dependent anisotropic dielectric constants of a crystal of 1 were evaluated along the a, b and c axes, where the thermally activated motion of the structurally flexible cis-CHDA dication was consistent with the dielectric responses. The motions, dielectric properties and magnetism of [Ni(dmit)2]- salts with flexible cis-cyclohexane-1,4-diammonium ion have been investigated.

Original languageEnglish
Pages (from-to)3732-3739
Number of pages8
JournalEuropean Journal of Inorganic Chemistry
Issue number23
Publication statusPublished - 2012 Aug


  • Dielectric anisotropy
  • Magnetic properties
  • Molecular motion
  • Organic-inorganic hybrid composites
  • Supramolecular chemistry


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