Decamethylmanganocenium tetracyanoethenide, [Mn(C5Me5)2]⊙⊙⊕ [TCNE]⊙⊖—a molecular ferromagnet with an 8.8 K Tc


  • We gratefully acknowledge support from the U.S. Department of Energy Division of Materials Science Grant No. DE-FG02-86ER45271.A000. We appreciate the powder X-ray diffraction analysis kindly provided by C. Foris and G. Hyatt.


Communication: Triplet electron-transfer salts are predicted to exhibit bulk ferromagnetic behavior at higher temperatures than their singlet analogues. To test this expected trend, the title compound, which is isostructural with [FeCpmath image]⊙⊕ [TCNE]⊙⊖ (Cp* = pentamethylcyloopentadienide; TCNE = tetracyanoethylene) which exhibits a Curie temperature, Tc, of 4.8 K has been synthesized. The synthesis and magnetic characterization of the new compound, which is found to have aTc of 8.8 K, are reported.