Structures of flexible supramolecular cations (1,4-cyclohexanediammonium 2+)(crown ethers) 2 in [Ni(dmit) 2] - salts

T. Akutagawa, A. Hashimoto, S. Nishihara, T. Hasegawa, T. Nakamura

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23 Citations (Scopus)

Abstract

Supramolecular dication structures, (CHDA 2+)(crown ethers) and (CHDMA 2+)(crown ethers) complexes, were introduced as counter cations to [Ni(dmit) 2] - anions (S=1/2 spin) (CHDA 2+=trans-1,4-cyclohexanediammonium; CHDMA 2+=1,4-bis(methylammonium)cyclohexane; dmit 2-=2-thioxo-1,3-dithiole-4,5-dithiolate; crown ethers=[12]crown-4, [15]crown-5, or [18]crown-6). The cyclohexane rings, with the -NH 3 + or -CH 2-NH 3 + substituents at trans-1,4-positions, arrange into the crown ethers complexes within the [Ni(dmit) 2] - salts. The cyclohexane rings adopt chair conformations, resulting in sandwich-type (CHDA 2+ or CHDMA 2+)(crown ethers) 2 structures, through N-H... O hydrogen-bonding interactions within the crystals between the ammonium moieties of cations (-NH 3 + or -CH 2-NH 3 +) and the oxygen atoms of the crown ethers. Formations of π-π dimer structures of [Ni(dmit) 2] - anions were observed in all salts. The selections of the dication structures (CHDA 2+ or CHDMA 2+) and the crown ethers, due to the various ring sizes, can influence the intra and interdimer interactions of the [Ni(dmit) 2] - anions in the crystals.

Original languageEnglish
Pages (from-to)175-186
Number of pages12
JournalJournal of Supramolecular Chemistry
Volume2
Issue number1-3
DOIs
Publication statusPublished - 2002 Jan 1
Externally publishedYes

Keywords

  • Crown ether
  • Cyclohexane
  • Magnetism
  • Supramolecular cation
  • [Ni(dmit) ]

ASJC Scopus subject areas

  • Chemistry(all)
  • Organic Chemistry
  • Inorganic Chemistry
  • Materials Chemistry

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