Crystal structure and magnetic susceptibility of (CH3)2NH2MnCl3 (DMMC): A low-symmetry analog of (CH3)4NMnCl3 (TMMC)

Abstract

The crystal structure of ${\left(\mathrm{C}{\mathrm{H}}_3\right)}_2$N${\mathrm{H}}_2$Mn${\mathrm{Cl}}_3$ consists of linear chains of face-sharing Mn${\mathrm{Cl}}_6$ octahedra which are hydrogen bonded together by the dimethylammonium ions. The Mn-Cl distances range from 2.514 to 2.582 Å and the bridging Mn-Cl-Mn angles from 77.19° to 79.68°. The compound is monoclinic, $\frac{P{2}_1}{c}$, with $a=8.811\mathrm{}\left(3\right)\mathrm{}$ Å, $b=13.265\mathrm{}\left(4\right)\mathrm{}$ Å, $c=6.460\mathrm{}\left(2\right)\mathrm{}$ Å, and $\beta =99.18\mathrm{}\left(2\right)\mathrm{}$. The magnetic susceptibility shows a broad maximum near 60°K, typical of a one-dimensional antiferromagnet. A fit of the data to a mean-field-corrected Fisher model gives an intrachain exchange coupling of -6.9°K and an interchain coupling of -0.5°K.