Abstract

The dissociation constances of (RS)-1-isopropyl dihydrogen citrate and the stability constants of its metal complexes with Cu(II), Ca(II) and Zn(II) have been determined in the aqueous state by a potentiometry. The solid-solid phase transition of its Zn(II) complex has been studied by the thermogravimetry/differential thermal analysis (TG/DTA), IR spectrometry and X-ray powder analysis. It was found that the physical properties, this is, the contents of the water molecule of crystallization, the coordination geometries and the crystal structures before and after the transition, were changed.

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