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Abstract
This work investigates the X-ray absorption spectra of the Cu K-edge in the layered compounds (C, H;?, +, NH&CuC14 (n=1-3) and their variation with pressure. The XANES spectra show a three peaked structure around 8.98 KeV at zero pressure which is characteristic of Cu2+ complexes in D4., symmetry. Application of hydrostatic pressure induces a progressive reduction of the energy separation between the second and third peaks that has been interpreted in terms of a progressive disappearance of the antiferrodistortive structure exhibited by the Cu2+ complexes in this compound series. The results are compared with recent pressure experiments on Raman and Charge Transfer spectroscopy as well as with Multiple Scattering calculations performed on these layered systems.