Cu(II) halopropionate complexes

Cu(II) complexes were prepared with the following acids: propionic, α- and β-bromoproionic, α- and β-chloropropionic, α,β-dichloropropionic and β-iodopropionic. On the basis of elemental and thermogravimetric analyses the compositions of the complexes crystallized from water and recrystallized from methanol, acetone and dioxane was determined.

The effect of these solvents on the spectral properties of Cu(II) halopropionates in the UV and IR region was investigated, and it is shown that in solvents of low dielectric constants dimeric structures may occur. IR spectra of the Cu(II) complexes recrystallized form the above mentioned solvents and of their sodium salts were measured. The results obtained indicate that the structure of Cu(II) halopropionates is always dimeric in the solid state, analogous to that of Cu(II) acetate monohydrate. This conclusion is also confirmed by abnormal magnetic moments of these complexes. Temperature dependent magnetic susceptibilities indicative of antiferromagnetic nature were observed.