XAFS study of copper(II) diethylenetriamine complexes having different coordination geometries

16th International Conference on X-ray Absorption Fine Structure

Gaur, A.^1 ; Klysubun, W.^2 ; Joshi, S.K.^3 ; Soni, Balram^4 ; Shrivastava, B.D.^4 ; Prasad, J.^5 ; Srivastava, K.^5

Institute for Chemical Technology and Polymer Chemistry, Karlsruhe Institute of Technology (KIT), Engesserstrasse 20, Karlsruhe

D-79131, Germany^1

Synchrotron Light Research Institute, 111 University Ave., Nakhon Ratchasima

30000, Thailand^2

Physics Department, Government P G Arts and Science College, Ratlam

457001, India^3

School of Studies in Physics, Vikram University, Ujjain

456010, India^4

Department of Chemistry, University of Allahabad, Allahabad

211002, India^5

关键词: Coordination geometry;    Crystalline form;    Derivative spectra;    Diethylenetriamine;    Exafs analysis;    Square-pyramidal geometry;    White lines;    XANES spectra;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/712/1/012084/pdf
DOI  :  10.1088/1742-6596/712/1/012084

来源: IOP

【 摘 要 】

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.