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- W67094106 abstract "The polynuclear heterometallic (iron, cobalt) dioximates FeCoD/sub 2/Cl/sub 2/(C/sub 5/H/sub 5/N)/sub 2/ x 2H/sub 2/O (I), Fe/sub 2/CoD/sub 2/(DH)/sub 2/Cl/sub 3/(H/sub 2/O)/sub 3/ (II), and Fe/sub 2/CoD/sub 2/(DH)/sub 2/Cl/sub 2/(4-CH/sub 3/C/sub 5/H/sub 4/N)/sub 2/(H/sub 2/O)/sub 2/ (III) (DH/sub 2/ stands for dimethylglyoxime) have been synthesized. An investigation of I-III by Moessbauer spectroscopy has shown that high-spin Fe(III) ions appear in an octahedral hexaoxygen or mixed oxygen-halide environment involving the oxygen atoms of the hydroxyimino groups of DH/sub 2/ and the water molecules as well as the chloride ions. In III along with the Fe(III) ions there are Fe(II) ions in an Fe(III): Fe(II) ratio equal to 1:1 in a low-spin state in an environment of six nitrogen atoms from the DH/sub 2/ and 4-CH/sub 3/C/sub 5/H/sub 4/N molecules. An analysis of the IR spectra (400-4000 cm/sup -1/) has provided evidence of the presence of an MN/sub 4/ dioximate chelate grouping and coordinated molecules of the amine and evidence of the absence of intramolecular hydrogen bonding in I-III. The values of ..mu../sub eff/ for I-III (295/sup 0/K) correspond to Fe(III) with S = 5/2. A thermogravimetric investigation of I-III has shown that the temperature for their complete decomposition ranges from 195more » to 240 /sup 0/C. The elimination of 4-CH/sub 3/C/sub 5/H/sub 4/N has been characterized by kinetic parameters.« less" @default.
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- W67094106 date "1988-04-01" @default.
- W67094106 modified "2023-09-24" @default.
- W67094106 title "Heterometallic (iron, cobalt) dioximates" @default.
- W67094106 hasPublicationYear "1988" @default.
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