ABSTRACT
A new series of [ML [H2O]2CL] complexes is prepared, where M = Co [2], Ni [2] or Cu [2] ions and L is monoanionic tridentate hydrazone ligands. The complexes are characterized by elemental and thermogravimetric analysis. The IR-spectra revealed that the bonding of ligands to the metal ion involves the displacement of the proton from the 0-OH of the arylidene rest and coordination to the C = 0 and C = N groups. The shifts of the C = 0 and C = N bands are utilized for the determination of the coordination bond length. Electronic and EPR spectra of the complexes suggested octahedral geometry around Ni [2] or Co [2] ions and elongated octahedral around Cu [2] leading to square planar geometry in extreme state
ABSTRACT
Diamide of L[+]-tartaric acid derivatives were prepared by the reaction of di-O-acetyl-L [+]- tartaric acid anhydride or di-O-benzoyl-L [+]-tartaric acid anhydride or methyl ester of L[+]-tartaric acid with isopropanolamine or ethanolamine. The structure of the compounds was confirmed by spectroscopic data and microanalysis. The compounds, especially di-O-acetyl derivatives, reacted with metal ions [Cu++, Ca++ and Mg++] in methyl alcohol at room temperature producing crystalline, water soluble products. The chelating behavior of the compounds toward some metal ions was studied by spectrophotometric and IR methods. The chelating properties of the compounds were highly affected by the type of O-substitute groups in tartaric acid derivatives
ABSTRACT
The electronic absorption spectra of some hydroxy derivatives of benzylidene benzole hydrazide were investigated in organic solvents of varying polarities and buffer solutions of different pH values. The behaviour in buffer solutions was utilized for the determination of the acid dissociation constant. The important bands in the ir-spectra of the compounds as well as the main signals in the [1] Hnmr spectra were discussed in relation to molecular structure