Graphite intercalation compounds with Fe and Ni have been investigated by means of EXAFS spectroscopy. Iron atoms have been shown to form π-type complexes where the carbon net acts as a polydentate aromatic ligand. In contrast, nickel atoms form two-dimensional monolayers with close-packed hexagonal structure
Thermal transformations of Fe Ilt maleate, [Fe30(OOCCH=CHCOOH)6]OH 9 3H20 (1), in an autogenerated atmosphere and the change in the short-range surrounding of Fe atoms during thermolysis were studied. The thermal transformations of 1 are accompanied by the folIowing processes: dehydration with simultaneous rearrangement of the ligand environment and formation of maleic acid, and polymerization of the rearranged monomer and its decarboxylation at high temperatures. In the initial stage of decarboxylation, the destruction of the metal-cat-boxylate FejO complex occurs followed by the formation of the Fe--Fe bond (r = 0.246 nm). The oxidation of the Fe atoms is observed when the thermolysis duration increases.
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