Journal of Thermal Analysis and Calorimetry

, Volume 124, Issue 1, pp 375–385 | Cite as

Synthesis, spectroscopic, thermal and XRD studies of aminoguanidinium copper and cadmium oxalates

Crystal structure of the copper complex
  • Rajendran Selvakumar
  • Steven J. Geib
  • Thathan PremkumarEmail author
  • Subbiah GovindarajanEmail author


New aminoguanidinium metal oxalate complexes with the formulae (AmgH)2[Cu(C2O4)2] and (AmgH)2[Cd(C2O4)2(H2O)2] have been synthesized and characterized. The copper compound loses aminoguanidine exothermically at 240 °C in DTA, whereas aminoguanidine is lost endothermically at 200 °C in cadmium. Both cases decompose exothermically via their respective metal oxalate intermediates to give metal oxide as the end product. It was also observed that hydrazine is lost exothermically in the hydrazinium copper oxalate hydrate. The single-crystal X-ray diffraction study of the copper complex revealed that aminoguanidinium ions are not involved in coordination but act as charge-compensating cations. It is interesting to note that both oxalates act as bidentate chelating ligands. One oxalate bridges the neighbouring copper atom through its carbonyl oxygen with a bond length of 2.561 Å to form square pyramidal geometry around the copper atom.


Chemical synthesis Inorganic compounds X-ray diffraction Crystal structure 



This paper was supported by the Faculty Research Fund, Sungkyunkwan University, 2013.

Supplementary material

10973_2015_5136_MOESM1_ESM.pdf (198 kb)
Supplementary material 1 (PDF 197 kb)


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Copyright information

© Akadémiai Kiadó, Budapest, Hungary 2015

Authors and Affiliations

  1. 1.Department of ChemistryGovernment College of TechnologyCoimbatoreIndia
  2. 2.Department of ChemistryUniversity of PittsburghPittsburghUSA
  3. 3.The University College, Department of ChemistrySungkyunkwan UniversitySuwonSouth Korea
  4. 4.Department of ChemistryBharathiar UniversityCoimbatoreIndia

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