Silver(II) Complexes Containing Heterocyclic Imines and Imine-Carboxylate Ligands : A Literature and Experimental Study
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The lack of silver(II) complexes and characterization data for those derivatives are components that has increased the curiosity in understanding silver(II) compounds. The spectral properties and the strong oxidizing nature of silver(II), is also that of great interest. An experimental approach in the synthesis of silver(II) complexes was conducted and structure and properties were verified. Infrared analysis confirmed that the synthesized compounds had a successful reaction. Using a Varian–Cary Bio 300 spectrophotometer, the electronic structure of the silver(II) compounds were determined. All four–coordinate silver(II) complexes that demonstrated a square–planar geometry showed only one distinct band, a common feature for such complexes. This band represents the d–d transitions. The six–coordinate octahedral complexes, which display distortions due to the bite angle that is formed by the chelating ligands, exhibited more than one band in the electronic analysis. The six–coordinate distorted structure was a result from the fact ligand coordinate themselves in a tridentate fashion when it bonds with the silver2+ atom. In addition, the six–coordinate complexes have a high solubility in water, while the square–planar are not soluble in water, allowed for the molar absorptivity to be calculated. The calculated molar absorptivity further confirmed that the complexes were at the 2+ oxidation state and that the correct compound was formed. The electronic spectra established the motif that silver(II) square–planar complexes will display one band while the octahedral complexes will demonstrate two bands.