Magnetic properties of the quasi one-dimensional Heisenberg linear chain antiferromagnet: manganocene

Magnetic susceptibility measurements on the rhombic form of manganocene, Mn(C₅H₅)₂, are reported between 0.94 and 297.5 K. A pronouced minimum in the 1/x^corr_m versus T curve is located at T_min = 141 ± 1 K. The results are well reproduced by the solution of Fisher to the quasi one-dimensional Heisenberg linear chain modified such as to include interchain interaction for J/k = ?14 K, g = 2x = ?5 K. A less accurate approximation to the experimental results has been achieved in terms of the pair model (J/k = ?22.5 K, g = 2.0). The results are in excellent agreement with the zigzag chain structure of C₅H₅Mn units reported for the compound.