Crystal structure and magnetic properties of linear chain potassium aquotetrafluoromanganate(III)

• Published in: Journal of solid state chemistry 1988-09, Vol.76 (1), p.33-39
• Main Authors: Palacio, Fernando, Andres, Mercedes, Esteban-Calderon, C., Martinez-Ripoll, M., Garcia-Blanco, S.
• Format: Article
• Language: English
• Subjects: Condensed matter: structure, mechanical and thermal properties; Exact sciences and technology; Halides, chalcogenides and analogous compounds of group vb; Inorganic compounds; Physics; Structure of solids and liquids; crystallography; Structure of specific crystalline solids
• ISSN: 0022-4596; 1095-726X
• DOI: 10.1016/0022-4596(88)90190-9

The crystal structure and single-crystal ac magnetic susceptibilities of KMnF 4·H 2O are reported. The structure, which is isomorphous to that of RbMnF 4·H 2O, consists of chains of alternating trans-[ MnF 4F 2 2 ] 2− and trans-[ MnF 2F 2 2 ( H 2O ) 2] tetragonally elongated octahedra connected to each other by shared apical fluorine atoms. Crystal data: Space group C2 c , a = 13.907(1) Å, b = 6.2136(2) Å, c = 10.492(1)Å, β = 104.69(1)°, V = 877.0(2) Å 3, D c = 2.85 g cm −3, Z = 8, R = 0.044. Magnetic susceptibility measurements show a broad maximum around 52 K indicative of lower dimensionality behavior. The data may be fit to a Heisenberg S = 2 linear chain model with J k B = −6.5 K and g = 2.05. At 8.45 K a sharp peak in the susceptibility data parallel to the chains indicates weak ferromagnetic behavior.