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X‐ray K absorption spectroscopic study of some Schiff‐base polymers of cobalt
Author(s) -
Mujumdar P. V.,
Deshmukh Prabodhachandra C.,
Sapre V. B.,
Bhave N. S.
Publication year - 1988
Publication title -
x‐ray spectrometry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.447
H-Index - 45
eISSN - 1097-4539
pISSN - 0049-8246
DOI - 10.1002/xrs.1300170404
Subject(s) - cobalt , extended x ray absorption fine structure , xanes , bond length , absorption (acoustics) , crystallography , chemistry , muscovite , absorption spectroscopy , coordination number , coordination sphere , materials science , analytical chemistry (journal) , crystal structure , inorganic chemistry , optics , spectroscopy , ion , physics , organic chemistry , quartz , composite material , quantum mechanics
The results of a study of the x‐ray K absorption spectrum of cobalt in the elemental form and in some of its Schiff‐base coordination polymers are presented. The K absorption discontinuity of cobalt was recorded together with the x‐ray absorption near‐edge structure (XANES) and extended x‐ray absorption fine structure (EXAFS) associated with it by employing a 0.4 m Cauchois‐type bent‐crystal spectrograph. The (100) planes of a muscovite mica analyser crystal were used for reflection of x‐radiation, the source of which was the tungsten target of a Chirana conventional x‐ray tube. Measurements were made of the chemical shift, edge width, XANES and EXAFS associated with the discontinuity. Levy's theory and the graphical method based on the theory of Stern and coworkers were employed to determine the average radius of the first coordination sphere surrounding the cobalt atom in all the systems studied. The results are discussed in terms of the bond length, bond ionicity, coordination geometry and some other parameters related to the local environment of the absorbing cobalt atom.