Transition metal halide salts of N-methylmorpholine: Synthesis, crystal structures and magnetic properties of N-methylmorpholinium salts of copper(II), cobalt(II) and manganese(II)

A family of complexes of N-methylmorpholinium metal halides has been synthesized and analyzed using X-ray crystallography and temperature dependant magnetic susceptibility. The compounds produced include (nmmH)2[CuCl4] (1), (nmmH)2[CoCl4] (2), (nmmH)2[MnCl4] (3), (nmmH)2[CuBr4] (4), (nmmH)2[CoBr4] (5), and (nmmH)2[MnBr4] (6) [nmmH = N-methylmorpholinium]. The compounds are all isomorphous and exhibit weak one dimensional antiferromagnetic interactions, with a contribution from single-ion anisotropy in the case of the cobalt complexes.