Synthesis and magnetic properties of 2,2,4- and 2,2,6-triphenyl-1,2- dihydroquinoline-N-oxyl derivatives

Masaru Yao, Hideki Shibuya, Takashi Kato, Hidenari Inoue, Naoki Yoshioka

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)

Abstract

The synthesis and magnetic properties of two novel aromatic N-oxyl radicals based on the quinoline skeleton, 2,2,4-triphenyl-1,2-dihydroquinoline-N-oxyl (1) and 2,2,6-triphenyl-1,2-dihydroquinoline-N-oxyl (2) are described. ESR measurements and DFT calculations for 1 and 2 revealed that their spins were delocalized over the π-systems. Based on the SQUID measurement, 1 exhibited a weak antiferromagnetic interaction in its crystal. For 2, two crystalline phases were obtained, and the α-phase of 2 exhibited a paramagnetic behavior; however, the β-phase of 2 showed a weak ferromagnetic interaction. The observed ferromagnetic interaction was analyzed by a dimer model, and the singlet-triplet gap was estimated to be 2J = +2.5 cm -1.

Original languageEnglish
Pages (from-to)2828-2834
Number of pages7
JournalPolyhedron
Volume24
Issue number16-17
DOIs
Publication statusPublished - 2005 Nov 17

Keywords

  • Aromatic N-oxyl radical
  • DFT calculation
  • Magneto-structural correlation
  • Molecule-based magnetism
  • Polymorphism
  • SQUID measurement

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Inorganic Chemistry
  • Materials Chemistry

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