EXAFS Spectroscopy-Fundamentals,Measurement Techniques,Data Evaluation and Applications in the Field of Phthalocyanines

摘要

EXAFS spectroscopy is a useful method for determining the local structure around a specific atom in disordered systems.This technique provides information about the coordination number,the nature of the scattering atoms surrounding a particular absorbing atom,the interatomic distance between the absorbing atom and the backscattering atoms,and Debye-Waller factor.The measurements are done with high energy X-rays,which are normally generated by synchrotron radiation sources.The data analysis is facilitated by specially developed program packages suitable for evaluation purposes.EXAFS spectroscopy is employed in several fields for a variety of applications.Here the structural characterization of a series of amorphous mu-oxo-bridged metallophthalocyanine dimers is presented.It is found that the phthalocyanine macrocycle has significant influence in the spectra and the results obtained are in agreement with the well-known structure of phthalocyanine complexes.