Dhiyaa Kareem Muslem
Four copper (II) and oxovanadium (IV) complexes of some enaminones derived from acetylacetone or trifluoroacetylacetone with methylamine have been prepared and investigated by physicochemical methods. The results have been proposed that the copper and oxovanadium complexes are in (1:2) (metal:ligand) composition and they have a square planer and square pyramidal structure, respectively. Lewis Acid-Base interaction has been studied for the prepared complexes as acceptors with pyridine as donor, and all the reactions were found as 1:1 interactions. Equilibrium consonants (Keq) for these interactions in chloroform have been measured using visible technique at different temperature. These values are within the range 6.58-16.43 L.mol-1. Thermodynamics functions ΔH, ΔG and ΔS for these interactions have also been measured. The ΔH values were within the range (-22.0 to +15.25) KJ.mol-1. The ΔG values were within the range of (−5.47 to −6.62) KJ.mol-1 while the ΔS within −55.47 to 73.38 J.mol-1.K-1.
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