Syntheses, structural characterizations and microbial activities of Ni(II) and Zn(II) 5-aminoisophthalate coordination polymers

Abstract

<p>Two coordination polymers with 5-aminoisophthalic acid (H₂aip), [Ni(μ-aip)(H₂O)₂(tmeda)]_n (<b>1</b>) and {H₂dap[Zn₂(μ-aip)(μ₃-aip)₂]∙9H₂O}_n (<b>2</b>) (H₂ai<i>p</i> = 5-aminoisophthalic acid, tmeda = N,N,N′-N′-tetramethylethylenediamine, da<i>p</i> = 1,3-diaminopropane) have been synthesized. Elemental and thermal analyses, magnetic susceptibilities, IR, AAS, mass and UV–vis spectroscopic studies have been performed to characterize the compounds. Nickel(II) has octahedral geometry by two oxygens of different carboxylates, bidentate, tmeda as bidentate chelating and two water ligands. Zn(II) has tetrahedral geometry by three oxygens of different carboxylate groups and one nitrogen by amine of aip. <b>1</b> crystallizes in the orthorhombic crystal system with space group Pccn and <b>2</b> in monoclinic crystal system with space group P2₁/c. Complex <b>2</b> exhibits photoluminescence properties in the solid state at room temperature. This study determined the susceptibility patterns of <b>1</b> and <b>2</b> against bacterial, yeast and mold micro-organisms. Antimicrobial activities were done on 12 different micro-organisms using the micro-dilution method. Tested microbial species were inhibited by <b>1</b> with a Minimum inhibitory concentrations (MIC) of 375–3000 μg mL⁻¹. Compound <b>2</b> showed antimicrobial activities against tested micro-organisms with a MIC of 188–1500 μg mL⁻¹. Compound <b>2</b> showed antibacterial activity against <i>Legionella pneumophila</i> sg1 375 μg mL⁻¹ (MIC value).</p