Magnetic susceptibility of 1,4-butanediammonium tetrachlorocuprate

Magnetic susceptibility and magnetization measurements have been made on powdered and single-crystal 1,4-butanediammonium tetrachlorocuprate. The compound is found to be nearly a two-dimensional (2D) ferromagnet with a intraplanar exchange of 13.0 ± 0.2 K and an interplanar exchange of -0.16 K. The transition temperature to 3D antiferromagnetic order occurs at 8.85 ± 0.1 K. The preliminary crystal structure is reported with lattice constants of $a=9.094\mathrm{}$, $b=7.571\mathrm{}$, and $c=7.375\mathrm{}$ in the space group $\frac{P{2}_1}{c}$. The crystal is monoclinic with $\beta =13.1\mathrm{}°$. Comparisons between this compound and other members of this series are made.