Chinese Journal of Catalysis ›› 2015, Vol. 36 ›› Issue (7): 1101-1108.DOI: 10.1016/S1872-2067(14)60318-1

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Ni(II), Co(II), and Cu(II) complexes incorporating 2-pyrazinecarboxylic acid: Synthesis, characterization, electrochemical evaluation, and catalytic activity for the synthesis of 2H-indazolo[2,1-b]phthalazine-triones

Behnaz Afzaliana, Joel T. Magueb, Maryam Mohamadia, S. Yousef Ebrahimipourc, Behjat Pour amiric, Esmat Tavakolinejad Kermanic   

  1. a Department of Chemistry, Payam Noor University (PNU), 19395-4697 Tehran, Iran;
    b Department of Chemistry, Tulane University, New Orleans, LA 70118, USA;
    c Department of Chemistry, Faculty of Science, Shahid Bahonar University of Kerman, Kerman, Iran
  • Received:2015-01-11 Revised:2015-02-10 Online:2015-06-12 Published:2015-07-30

Abstract:

Three complexes containing 2-pyrazinecarboxylate (pzca-), including [Ni(pzca)2(H2O)2], [Co(pzca)2(H2O)2], and [Cu(pzca)2(H2O)2], have been synthesized and characterized using physicochemical and spectroscopic methods. Furthermore, the structure of each complex was determined by single-crystal X-ray diffraction. All three complexes have an octahedral geometry, where the metal ion chelated by two carboxylate oxygens, two nitrogen atoms belonging to pyrazinic acid molecules, and two oxygen atoms of two water molecules. The catalytic activities of these complexes were also investigated in the green synthesis of 2H-indazolo[2,1-b]phthalazine-triones by the reaction of hydrazine hydrate with an arylaldehyde, phthalic anhydride, and dimedone in acetic acid.

Key words: 2-Pyrazinecarboxylate complexe, ON bidentate ligand, X-ray crystal structure, Cyclic voltammetry, 2H-indazolo[2,1-b]phthalazine-triones