Synthesis, Characterization and Quantum Chemical Studies of Some Co(II) and Cu(II) Complexes of Acetoacetic Acid Hydrazide

Abstract

Transition metal complexes of hydrazides have been intensely investigated by coordination chemists because of their interesting structural properties and their wide ranging applications 1-5. Aliphatic carboxylic acid hydrazides among many other uses are employed as metal ion removal from waste waters 6 , aromatic hydrazides are used as stabilizers for rigid PVC against therm-oxidative degradation 7. Hydrazides are also used for the extraction of non-ferrous metals and rare earth from aqueous solutions 8-10,11. The coordinating ability of hydrazides to a variety of elements particularly transition metals afford the study of the metals in such systems. In continuation of our studies on alkyl acetoacetate hydrazides 12,13 we present the results of our investigations on the synthesis, spectral and the theoretical studies of Co(II) and Cu(II) complexes of acetoacetic acid hydrazide. The complexes are new and represent the first systematic study of acetoacetic acid hydrazide series. EXPERIMENTAL Reagents grade cobalt(II) acetate tetrahydrate, cobalt(II) chloride hexahydrate, cobalt(II) sulphate heptahydrate, copper(II) acetate monohydrate, copper(II) chloride dihydrate, copper(II) sulphate pentahydrate, copper(II) nitrate pentahydrate, ethylacetoacetate, hydrazine hydrate, methanol were available from BDH.

Synthesis, characterisation and antibacterial study of copper(ii) complexes of new benzylacetone-benzoylhydrazone and its <i>para</i>-nitro and <i>para</i>-hydroxy substituted analogues

“…This was achieved by reacting appropriate 4-substituted alkyl esters with a solution of hydrazine hydrate under reflux conditions. In the second step, this benzoylhydrazide and its substituted derivatives were subjected to a condensation reaction with benzylacetone, to give the respective hydrazones derivatives (Ajayeoba et al, 2021;Adekunle et al, 2013)…”

Theoretical Study on Structure and Electronic Properties of 4H-Cyclopenta[2,1-b,3;4-b’]dithiopene S-oxide and Its CCl₂ and CF₂ Bridged Derivatives

“…However, monitoring the decrease in band gap as a way of controlling the electric properties of polythiophenes are strongly governed by the intramolecular delocalization of π-electrons along the conjugation chain [8]. This delocalization has been found to depend on the extent of the overlapping between the p z orbitals of the carbon atoms in positions α and α' of adjacent thiophene rings, this is also strongly influenced by substituents [9][10][11][12][13][14][15][16][17][18].…”