ISSN:
1089-7550
Source:
AIP Digital Archive
Topics:
Physics
Notes:
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− aitch-theta ). aitch-theta 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. © 2000 American Institute of Physics.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.372595
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