Preparation and characterization of a copper(II) compound with a new glycine Schiff base containing an ester function

Summary A new Schiff base was obtained from glycine and ethyl--ketocyclopentylcarboxylate. This forms a potassium salt K(Rgly)·H₂O, where Rgly=C₁₀H₁₄O₄N. From this salt a new copper(II) complex was prepared, Cu(Rgly)·2H₂O, where Rgly=C₁₀H₁₃O₄N (deprotonated Schiff base). The compounds were characterized by i.r. spectroscopy, differential thermal analysis (d.t.a.) and thermogravimetric analysis (t.g.). The activation energy corresponding to the dehydration process for compounds was determined. On the basis of spectral data, the copper compound is believed to be pentacoordinate and square pyramidal.