Abstract  Three new supramolecular carboxylato complexes,  (  HdatrzH)[Fe(dipic)2]2- .6H2O (1) (HdatrzH)[Cu(Hdipic)(dipic)].3H2O(2) and (HdatrzH)2[Zn(dipic)2)].4H2O (3) (HdatrzH = 3,5-diamino-1,2,4- triazolium ion, dipic = pyridine- 2,6-dicarboxylate ion) were synthesized and characterized by elemental analyses, spectroscopic methods (IR, UV, 1H NMR and Mass spectroscopy), and single crystal X-ray diffraction technique. The room temperature magnetic susceptibility measurements show magnetic moments of 5.92, 1.67 and 0 B.M at 298K for compounds (1  ), (2  ) and (3  ), respectively indicating that (1  ) and (2  ) are paramagnetic while (3  ) is diamagnetic. The asymmetric unit of (1  ) consists of [Fe(dipic)2-and HdatrzH+ and six molecules of lattice water, compound (2  ) contains two tridentate dipicolinate ligands, one triazolium ion and three water molecules while the asymmetric unit of (3)   contains two tridentate dipicolinate ligands , two triazolium ion, and four water molecules. The coordination environment around the metal ions is such that the two dipiconilate ligands are assembled perpendicular to each other with two axially oriented N atoms and four O atoms on the equatorial positions revealing distorted octahedral geometries for compounds 1-3. The hydrogen bonding, that is O�H���O, O�H���N and N�H���O between carboxylate, (HdatrzH)+and water play significant roles in stabilizing the crystal structures.Compound (2  ) shows a significant free radical scavenging ability while (1  ) and (3 ) show good antimicrobial activities.Keywords: Metal complexes, hydrogen bonding, pyridine-2, 6-dicarboxylic acid, antioxidant and antimicrobial activities.

One-pot synthesis, spectroscopic characterization, crystal structure, and biological activity of supramolecular Fe(III), Cu(II) and Zn(II) compounds obtained from pyridine-dicarboxylic acid and 3,5-diamino-1,2,4- triazole

247th National Meeting (2014)

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