Heterodinuclear complexes of Co(II)/Zn(II) and Mn(II)/Zn(II) with pyridine-2,6-dicarboxylic acid as a ligand (H2dipic, dipicolinate) have been synthesized yielding of reddish purple colour of Co(II)/Zn(II) dipicolinic crystal and reddish colour of Mn(II)/Zn(II) dipicolinic crystal. The determination of elements composition (%) of complex compound using atomic absorption spectroscopy and CHN elemental analyzer (C = 28.96; H = 3.47; N = 5.42; Co = 10.15 Mn = 9.47 and Zn = 11.26) showed that the molecular formula of Co(II) complex compound is [Zn(H2O)5Co(dipic)2]·2H2O, while that of Mn(II) complex compounds is [Zn(H2O)5Mn(dipic)2]·2H2O. The IR spectrum of the Co(II) and Mn(II) complexes showed a typical vibration absorption in the wavenumber of 3082 cm-1 indicating of Co(II)/Zn(II) dipicolinic and Mn(II)/Zn(II) dipicolinic have been formed. A brine shrimp lethality test (BSLT), used to determine the toxicity of complexes showed that LC50 of Co(II) complex and Mn(II) complexes were 283.71 and 354.94 mg/L, respectively.

Original languageEnglish
Pages (from-to)1773-1776
Number of pages4
JournalAsian Journal of Chemistry
Issue number8
Publication statusPublished - 1 Aug 2016


  • Co(II)
  • Complex compounds
  • Hdipic
  • Heterodinuclear
  • Mn(II)
  • Paramagnetic
  • Toxicity
  • Zn(II)


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