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IJPAP Vol.43(07) [July 2005] >


Title: X-ray K-absorption fine structure studies on some copper(II) complexes
Authors: Vyas, R K
Joshi, S K
Shrivastava, B D
Shah, M C
Prasad, J
Keywords: X-ray K-absorption spectra
Copper (II) complexes
Backscattering shift
Issue Date: Jul-2005
Publisher: CSIR
IPC CodeG01J3/28
Abstract:  The X-ray K-absorption spectra of copper and arsenic in complexes [Cu( φ3AsO)2X2] and [Cu( φ3PO)2X2], where X = Cl or Br and φ = C6H5, have been studied using a 40 cm bent crystal spectrograph. Various X-ray absorption parameters such as edge shift, phase parameters and bond-distances have been estimated. Our studies reveal that triphenylarsine oxide is a better s-donor than triphenylphosphine oxide. The splitting of the main edge K into K1 and K2 components have been explained. The existence of the white line have been attributed to the transition of K-electrons into a high density of normally unoccupied states with p symmetry in the neighbourhood of the copper or arsenic atom. Further, our studies on phase shift determination indicate that variation in the first or second coordination environment around the central absorbing atom has a dominant effect on the values of backscattering phase shifts.
Page(s): 509-516
ISSN: 0975-1041 (Online); 0019-5596 (Print)
Source:IJPAP Vol.43(07) [July 2005]

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