Two anisotropic Heisenberg linear chain manganese compounds

Isopropylammonium trichloromanganate(II) dihydrate

“…The magnetic coupling between the Mn 2+ ions in the dimer is determined principally by the bridging Mn--C1--Mn angle. The observed angle of 94.58 ° leads to very weak antiferromagnetic coupling, as evidenced by the results on (CsHsNH)MnC13.H20 and (C9HvNH)MnC13.H20 (Richards, Quinn & Morosin, 1973;Caputo, Willett & Morosin, 1978) as well as (CHa)3NHMnCla.2H20 (Merchant, McClearney, Shankle & Carlin, 1974). All of these linear chain salts contain similar bi-bridged geometries, and the exchange coupling, 2J, is of the order of-0.03 to --0.05 mm -1.…”

Trimethylammonium manganese(II) chloride dihydrate

“…The lattice parameters for the Co compound are a--16.671, b--7.273, and c = 8.113 A. These are significantly smaller than those for the Mn compound, as would be expected from the decrease in crystal ionic radius going from Mn I~ to Recently, a short account of the magnetic susceptibility of the Mn ~ salt has been published (Merchant, McElearney, Shankle & Carlin, 1974). The magnetic behavior was interpreted in terms of a collection of one-dimensional linear chains, with weak antiferromagnetic coupling along the chain as well as between chains.…”

Long Range Order. Ferromagnetism and Antiferromagnetism

“…2 H 2 0 [75], where, as usual, the g-value anisotropy of manganese(lI) is so small as to make the existence of an important D-M interaction unlikely. 2 H 2 0 [75], where, as usual, the g-value anisotropy of manganese(lI) is so small as to make the existence of an important D-M interaction unlikely.…”