Transition metal halide salts of 8-methylquinolinium: Synthesis and structures of (8-methylquinolinium)2 MX4·nH2O (M = Cu, Co, Zn; X = Cl, Br; n = 0, 1)

► A family of (8-methylquinolinium)tetrahalometallate salts has been prepared. ► The compounds have been characterized via IR, single-crystal X-ray diffraction and, for the Cu and Co salts, variable temperature magnetic susceptibility. ► The Cu salts show weak antiferromagnetic interactions, while the magnetic behavior of the Co salts is dominated by single ion anisotropy. ► The Zn salts may be isolated in both amorphous and monohydrate forms.