Abstract
The reaction of L (MAD) with Cu2+ and Co2+ chlorides affords new metal complexes. The isolated solid complexes were synthesized by two different techniques i.e., chemical and tribochemical methods. Four new complexes were synthesized by direct chemical reactions of MCl2 (M = Co2+ and Cu2+) with MAD in absolute EtOH. The isolated solid complexes were used as starting compounds to synthesize another four new complexes using tribochemical technique by grinding the previous complexes in the solid state with excess KI in agate mortar. The results of the isolated complexes indicate the substitution of the chloride by iodide ions during grinding and extraction of the complexes by a mixture of solvents (EtOH + MeOH). Also, the results suggest that no reduction of Cu2+ or oxidation of Co2+ complexes is observed. The IR spectra of the complexes suggest that L acts in a bidentate manner. Moreover, the results of electronic spectra and magnetic measurements for the chloride and iodide complexes suggest distorted-octahedral and/or tetrahedral for Cu2+ and high-spin octahedral and/or tetrahedral structures around the Co2+ ion, respectively.
Highlights
Malonic acid dihydrazide (MDH; L) is a vital class of ligands in coordination chemistry and finds extensive applications in different fields [1]
An increasing number of transition metal complexes of dihydrazides have been studied in details [17]
The aim of present work is to study the synthesis of novel Cu2+ and Co2+ complexes derived from L (MAH) by both chemical and tribochemical reactions and the isolated solid complexes were characterized by elemental analyses, spectral (IR, 1H-NMR and UV-vis.) and magnetic measurements
Summary
Malonic acid dihydrazide (MDH; L) is a vital class of ligands in coordination chemistry and finds extensive applications in different fields [1]. Earlier work illustrated that some drugs show increased activity when administered as metal chelates rather in the form of original organic compounds [7] [8]. These complexes play an important role in bioinorganic chemistry and redox enzyme systems [9] [10] [11]. The goal of synthesis of complexes by tribochemical is to study the role of KI on substitution and the oxidation and/or reduction of the metal ions. This method gives high yield and is considered as a cheap and new method for synthesis of new types of complexes
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