Dije  Dehari, Muhamet  Shehabi, Shefket  Dehari, Sevdije  Govori, 
    New Complexes of Co(II) and Cd(II) Using 4-Hydroxy-2-Oxo-2H Chromene-3-Carboxamide as Ligand,
    Research Journal of Applied Sciences,
    Volume 8,Issue 2,
    2013,
    Pages 112-115,
    ISSN 1815-932x,
    rjasci.2013.112.115,
    (https://makhillpublications.co/view-article.php?doi=rjasci.2013.112.115)
    Abstract: New complexes of cobalt(II) and cadmium(II) have been synthesized 
  in the reaction mixture of metals(II) acetate and 4-hydroxy-2-oxo-2H-chromene-3-carboxamide. 
  Diaquabis(4-hydroxy-2-oxo-2H-chromene-3-carboxamidato) cobalt(II) and dihidrokso(4-hydroxy-2-oxo-2H-chromene-3-carboxamide) 
  cadmium(II) were characterized by elemental analysis, IR spectroscopy and ESI 
  mass spectrometry. Elemental analysis and mass spectrometry data of the complexes 
  suggests the stoichiometry is 1:2 (metal-ligand). The results are in accordance 
  with an octahedral environment around the Co(II) ion and tetragonal for cadmium 
  ion.
    Keywords: Coumarin derivative complexes;IR spectroscopy;mass spectrometry;cadmium ion;cobalt(II)