Analysis of Copper (II) Mixed Ligand Complexes Using Extended X-ray Absorption Fine Structure Data

Abstract

X-ray absorption fine structure (XAFS) has been studied at the K-edge of copper in copper(II) complexes: Cu(L¹)₂Cl₂·2H₂O (1), Cu(L²)₂SO₄·5H₂O (2), Cu(L³)₂SO₄·5H₂O (3) and Cu(L⁴)₂SO₄·5H₂O (4), where L¹ = salicylaldehyde benzoyl hydrazine (SBH), L² = 5-nitro SBH, L³ = 5-methyl SBH, and L⁴ = 5‑bromo SBH. Cu K-Edge EXAFS beamline (BL-09) at 2.5 GeV established at Indus-2, RRCAT, Indore, India, was used to describe the data. Using the published crystal structures of each of these complexes, theoretical models have been created individually. Coordination numbers and bond length are among the characteristics of the structural that have been identified by fitting these theoretical models to the corresponding experimental EXAFS data. The first peak’s position in the Fourier transform, as well as the graphical technique of Levy, Lytle, and L.S.S., provide the value of the first shell bond length. The bond lengths of the complexes in study have been experimentally determined using the Levy, Lytle, and L.S.S. approach. These approaches’ outcomes have been compared to those of a theoretical approach.