Mössbauer spectroscopic and thermal decomposition studies of alkylamine and nitrogen heterocyclic substituted pentacyanoferrate(II) complexes
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説明
Abstract Substituted pentacyanoferrate(II) complexes Na 3 [Fe(CN) 5 L]· x H 2 O have been obtained for di- sec -butylamine, tri- n -amylamine, pyrazole, pyrazine, pyrrole, and 2-,3- and 4-cyanopyridine. Microanalysis, UV-visible, infrared, and Mossbauer spectroscopies, TGA-DTG and XRD were used to characterize the complexes. Each complex has an absorption band in the visible region that is assigned to a d-d transition. Mossbauer parameters are used to classify the various ligands according to their σ- and π- bonding abilities. The Mossbauer spectra of these complexes exhibit a quadrupole doublet, ΔE Q = 0.71–0.84 mm s −1 at room temperature. The isomer shift (δ) values fall within 0.00 ± 0.02 mm s −1 which suggests that the iron atom is in a + 2 low-spin state. Thermolysis of the solids leads to water release, ligand release and/or decomposition, yielding elemental metal, metal carbides, haematite and magnetite.
収録刊行物
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- Thermochimica Acta
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Thermochimica Acta 287 111-129, 1996-09-01
Elsevier BV