Ferromagnetic Long Range Ordering in Copper(2) Maleate Monohydrate.
NORTH CAROLINA UNIV AT CHAPEL HILL DEPT OF CHEMISTRY
Pagination or Media Count:
The magnetic properties of copper II maleate monohydrate, CuC4H2O4 H2O, have been measured in the 1.8-66 K range. Magnetic susceptibility and isothermal magnetization measurements on powdered samples reveal a transition to a ferromagnetic state in this layered compound. The transition to the ordered state occurs at Tc 4.0 K. The positive value of 8.0 K for the Weiss constant in the paramagnetic region confirms the ferromagnetic nature of the interactions. The magnetic susceptibility data above 3Tc may be fit with a Heisenberg quadratic layer expression with the best fit parameters J 4.3cm, g 2.0, and zJ 0.42cm. The e.p.r. spectrum at room temperature indicates orthorhombic symmetry. A complex containing the isomeric form of the ligand, copper II fumarate dihydrate, has also been prepared and its magnetic properties determined in the 80-300 K range. Keywords Heisenberg quadratic layer Ferromagnetism superexchange Low dimensional compounds Long range ordering Carboxylate bridges Copper compounds Maleates. mjm
- Inorganic Chemistry
- Organic Chemistry