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SYNTHESIS OF COPPER(II) COORDINATION COMPOUNDS 71
Different d orbital splitting patterns occur in square planar and tetrahedral coordination geometries, so a very large number of arrangements are possible. In most complexes the value of Δ corresponds to the absorption of visible light, accounting for the colored nature of many such compounds in solution and in solids such as CuSO4·5H2O.
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Complexes such as Cu(NH3)62+ have been known and studied since the mid-nineteenth century. and their structures had been mostly worked out by 1900. Although the hybrid orbital model was able to explain how neutral molecules such as water or ammonia could bond to a transition metal ion, it failed to explain many of the special properties of these complexes. Finally, in 1940-60, a model known as ligand field theory was developed that is able to organize and explain most of the observed properties of these compounds. Since that time, coordination complexes have played major roles in cellular biochemistry and inorganic catalysis.
The reaction between pyridoxal hydrochloride (PL•HCl) and aminoguanidine-hydrogencarbonate (AG.H2CO3) in the presence of Na2CO3•10H2O resulted in the formation of pyridoxal-aminoguanidine (PLAG; H2L) ligand. The ligand’s coordination chemistry with CuCl2 yielded a green-brown, octahedral dimmer of Cu (II) with the general formula of [Cu(PLAG)(NCS)2]2. This paper presents the synthesis and the structural analysis of this complex with the Schiff-based ligand.
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The Synthesis and Analysis of Ammine Complexes of Copper …
Synthesis and analysis of cooridnation compounds 6 amount of copper and ligand have been added in the correct ratio, the maximum amount of the
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