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- W1977001565 abstract "Four unsymmetrically substituted tris(N-alkyl,N′-hydroxyethyldithiocarbamato) iron(III) complexes, [(OHCH2CH2)RNCS2]3Fe with R=CH3, C2H5, n-C3H7 and n-C4H9 have been synthesized and characterized by IR, electronic, Mössbauer spectral and magnetic moment studies. Room temperature Mössbauer spectra of all the complexes exhibit an asymmetric doublet which could be resolved into two doublets corresponding to high and low spin states in equilibrium. Variable temperature Mössbauer spectral and magnetic moment studies suggest that all the complexes tend to become nearly low spin at 77 K. Isomer shift (δ) values show little variation in the two spin states of the complexes but ΔEQ increases with increasing chain length from CH3 to n-C4H9. Mössbauer spectra of heated products at 500 and 700 °C exhibit a doublet with sextet and sextet only, respectively, corresponding to the formation of Fe2O3. In no case was Fe2S3 found to be formed. All the complexes undergo decomposition in two stages finally yielding Fe2O3, but during the first stage it is a first order process. Various kinetic and thermodynamic parameters were calculated. It is observed that the activation energy values increase with the molecular weight of the alkyl groups attached to the N atom. There seems to occur an intramolecular rearrangement with restriction on the vibrational degrees of freedom." @default.
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- W1977001565 date "2002-11-01" @default.
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- W1977001565 title "Mössbauer spectral, magnetic moment and thermal decomposition studies of unsymmetrically substituted (N-alkyl,N′-hydroxyethyldithiocarbamato) iron(III) complexes" @default.
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- W1977001565 doi "https://doi.org/10.1016/s0277-5387(02)01231-7" @default.
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