Single-crystal low-temperature magnetisation studies of Cs2K[Mn(CN)6]

Abstract

The magnetisation in single monoclinic crystals of Cs,K[Mn(CN),] has been measured from 2 to 300 K and from 0.5 to 5 T along the [lOO], [OlO], [OOl] and [Ol I ] crystal directions. The data, with no symmetry approximations, can be fitted by the same general ligand-field model that was used for Cs,K[ Fe(CN),]. Hardly significant changes in the already small ligand-field parameters and appropriate changes in the metal parameters were required. Such approximate transferability of a ligand-field model, between 3d4 and 3d5 low-spin systems which have very different magnetic behaviour, encourages belief in the utility and reality of ligand-field modelling.

Rational Design of Tetranuclear Complexes Employing N‐Imidoylamidine Based Ligands

“…Further examination into the structural metrics of [Mn III (Py 2 ImAm) 3 ] reveal a trigonal distortion in the octahedral geometry of the Mn III ion along the C 3 axis. Not only is this reminiscent of previous examples of low spin Mn III compounds, but it should also be noted that there are only a small number of complexes that exhibit this spin state for an Mn III ion . This distortion results in slight changes to the energy levels of the d ‐orbitals (Figure S7), such that the orbital contribution to the magnetic moment for an S = 1 system should be quenched.…”

Cs2K[Mn(CN)6] at 293, 85 and 10 K

“…They crystallize well and are of interest in inorganic chemistry as classical coordination complexes involving the most covalently bonding of ligands, the cyanide ion, and for which the physical properties are well de®ned. There are previous structural studies of these elpasolites by Xray and neutron diffraction both at room temperature and at lower temperatures, for example, Cs 2 K[Cr(CN) 6 ] (Figgis et al, 1983;Brown et al, 1987), Cs 2 K[Mn(CN) 6 ] (Ziegler et al, 1989;Blake et al, 1994) and Cs 2 K[Fe(CN) 6 ] (Fletcher & Gibb, 1977;Herren et al, 1979;Figgis et al, 1990).…”

“…In particular, for M I = K, magnetic susceptibility and polarized neutron diffraction experiments have been performed on their single crystals (Figgis et al, 1985;Brown et al, 1987;Figgis & Reynolds, 1987;Reynolds et al, 1992;Blake et al, 1994). Also, for M I = Li, the complexities of thermal motion have received attention; see, for example, Chadwick et al (1988) and Ryan & Swanson (1974).…”