Title
The synthesis, spectroscopic and thermal study of oxamic acid compounds of some metal(II) ions The synthesis, spectroscopic and thermal study of oxamic acid compounds of some metal(II) ions
Author
Publication type
article
Publication
Weinheim ,
Subject
Chemistry
Source (journal)
Transition metal chemistry. - Weinheim
Volume/pages
20(1995) :5 , p. 454-459
ISSN
0340-4285
ISI
A1995TF92200009
Carrier
E
Target language
English (eng)
Full text (Publishers DOI)
Abstract
The preparation of oxamic acid complexes of general formula M(H2NCOCOO)(2) . xH(2)O (M = Mn-II, Co-II, Ni-II, Cu-II or Zn-II; x = 1 for Cu-II, x = 2 for the other metals) is reported. The i.r. and Raman spectra are discussed considering a trans-octahedral structure, formed by five-membered chelate rings with the amide oxygen and one carboxylic oxygen as donor atoms. The apical positions are occupied by water molecules. The thermal degradation process is very similar for the different complexes, first losing H2O in one or different steps, then the fragments of the organic ligand to give the metal oxide as residue. The thermal degradation of the Cu-II and Zn-II compounds results in the formation of a new polymeric compound by deprotonation of the primary amide function in an endothermic process, the polymer further decomposes to form the metal oxide.
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