Cooperative magnetic behavior in the coordination polymers [Cu3(TMA)2L3] (L=H2O, pyridine)

Xi Xiang Zhang*, Stephen S Y Chui, Ian D. Williams

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

115 Scopus citations

Abstract

The temperature and magnetic field dependent magnetization of the polymeric solids [Cu3(TMA)2L3], where TMA=benzene-1,3-5-tricarboxylate and L=H2O or pyridine have been measured up to 5 T. These polymers contain dimeric [Cu2(O2CR)4] units. Discrete dimers in molecules such as cupric acetate have strong antiferromagnetic coupling between their two Cu d9 centers and at low T their susceptibility diminishes to nearly zero. While at higher T (300-100 K) the magnetism of the [Cu3(TMA)2L3] polymers resembles that of individual the [Cu2] dimer molecules, at low T a new cooperative behavior is found, with a sharp increase in χ seen at temperature below 75 K. In the case of L=pyridine a plot of 1/χ vs T shows linearity from 65 to 20 K and fits the Curie-Weiss law χ=C/(T - Θ). Θ is found to be +4.7 K, indicative of a weak ferromagnetic coupling between dimers. This interaction may be facilitated by the planar aromatic bridges between the [Cu2] units.

Original languageEnglish (US)
Pages (from-to)6007-6009
Number of pages3
JournalJournal of Applied Physics
Volume87
Issue number9 III
StatePublished - May 1 2000
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Physics and Astronomy (miscellaneous)

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