FERROMAGNETIC BEHAVIOR OF DECAMETHYLCHROMOCENIUM TETRACYANOETHANIDE [CRCP2-ASTERISK][TCNE]

Studies on the magnetic properties of decamethylchromocenium tetracyan oethanide, [CrCp2][TCNE] are reported herein. Near-zero field (H = 15 0 mG) data indicates a ferromagnetic transition with T(c) = 3.65 K. Th e temperature dependence below T(c) can be fit to a mean-field result M = M0(l - T/T(c))1/2 and the data above T(c) gives a critical exponen t gamma = 1.2 for the dc magnetic susceptibility. Data at higher tempe rature indicates a strong 1-D ferromagnetic behavior. Magnetizations a t different H and T at low temperature can be scaled to a universal fu nction with M = f (H/T3.2). The reduction in T(c) in [CrCp2][TCNE] co mpared with [FeCp2][TCNE] indicates a competition between the couplin g constants and the residing spins.