Abstract
XAFS of three Cu(II) diethylenetriamine complexes (in crystalline form) having different coordination geometries have been investigated. First complex has distorted tetragonal pyramidal, second has distorted square planar and third has distorted square pyramidal geometry. The difference in coordination geometries has been inferred from the differences in pre-edge peak, rising part of edge and in shape of white line, which are seen clearly in the derivative XANES spectra. The distortion in geometry has been correlated with the intensity of peaks in derivative spectra. These inferences have been corroborated from EXAFS analysis where the different paths have been used in the theoretical fits in R space to show contributions of different scatterers at different distances.
Highlights
The properties of copper (II) sites, catalytic, redox and so forth, generally depend upon the particular copper(II) geometrical arrangement [1]
It can be inferred that the order of distortion is 1 > 2(square planar) > 3(square pyramidal)
The intensity of peak A is larger in 1 than 2 and 3 showing that distortion is maximum in tetragonal pyramidal geometry
Summary
The properties of copper (II) sites, catalytic, redox and so forth, generally depend upon the particular copper(II) geometrical arrangement [1]. Diethylenetriamine (dien) has varied applications, e.g., in removal of transition metal ions in waste waters and in measuring capacities of clays to exchange cation. It forms complexes with metals in aqueous solution. These complexes are stable in air and moisture and it is easy to obtain information about the coordination geometries using their spectroscopic signatures. The study of these complexes is interesting since they are stereochemically flexible and can have wide range of coordination geometries [2]
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