Two polymorphs of (anilinium)(18-crown-6)[Ni(dmit)2]: Structure and magnetic properties

Sadafumi Nishihara, Tomoyuki Akutagawa, Tatsuo Hasegawa, Shigeki Fujiyama, Toshikazu Nakamura, Takayoshi Nakamura

Research output: Contribution to journalArticlepeer-review

59 Citations (Scopus)

Abstract

Two polymorphs of monovalent [Ni(dmit)2]- (dmit2- = 2-thioxo-1,3-dithiole-4,5-dithiolate) crystals A and B, (anilinium)(18-crown-6)[Ni(dmit)2], were prepared, and the structure and magnetic properties were investigated. In these crystals, the [Ni(dmit)2]- molecules form dimers, which arranged into chains between the supramolecular cation structure (anilinium)(18-crown-6). In crystal A, supramolecular cation formed a regular stack, inducing ladder structure of [Ni(dmit)2], whose magnetism had been well fitted by spin ladder equation with the spin gap of Δ = 190 K. Crystal B is ca. 3% more densely packed compared to crystal A. Due to the dense packing, supramolecular cation stack is distorted, which prevented the intermolecular interaction between [Ni(dmit)2]- dimers in direction corresponds to the ladder-leg direction in crystal A. Reflecting the [Ni(dmit)2]- arrangement, crystal B showed a temperature dependence of magnetic susceptibility well reproduced by the singlet-triplet thermal activation model, whose antiferromagnetic exchange interaction (2J) was 140 K.

Original languageEnglish
Pages (from-to)661-667
Number of pages7
JournalJournal of Solid State Chemistry
Volume168
Issue number2
DOIs
Publication statusPublished - 2002 Nov 1
Externally publishedYes

Keywords

  • 18-crown-6
  • Crystal structure
  • Magnetic properties
  • Polymorph
  • Spin ladder
  • Supramolecular cation
  • [Ni(dmit)]

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Condensed Matter Physics
  • Physical and Theoretical Chemistry
  • Inorganic Chemistry
  • Materials Chemistry

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