LONG-RANGE MAGNETIC ORDER IN THE QUASI-1D METALLOPORPHYRIN FAMILY OF MOLECULE-BASED MAGNETS

The unusual magnetic properties of various members of the quasi-1D man ganese-porphyrin family are reviewed. Typical members of the family co nsist of spin S = 2 Mn-III porphyrin ions alternating with trans-mu(2) -bonded spin s = 1/2 accepters [C-2(CN)(4)](.) or [C-4(CN)(6)](.). All members exhibit 1D behavior at high temperatures as evidenced by thei r similarities to predictions for mixed quantum-classical ferrimagneti c chains. Below approximately 50 K, deviations from one-dimensionality are observed due to the effects of interchain interactions. The compe tition between interchain exchange, single-ion anisotropy, and dipolar interactions are considered when examining the remarkable differences in the low temperature magnetic states of the various compounds.