Synthesis and crystal structures of the chelating ligand 3-[(2,6-dimethylphenyl)hydrazono]-1,1,1-trifluoropentane-2,4-dione and its complex with copper(II)

The new aryl hydrazone ligand, 1, featuring an acetyl group of a previous compound of reference replaced by a trifluoroacetyl moiety and a corresponding Cu(II) complex, 2, have been synthesized and studied by X-ray crystallography. A distinct influence of the fluorine substitution relative to the nonfluorinated parent compound is manifested both in the free ligands and Cu(II) complexes, and in particular has an effect on the packing structures mainly due to C-H center dot center dot center dot F contacts.