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Khedr, Abdalla M.,Gaber, Mohamed,Abd El‐,Zaher, Eman H. SCIENCE PRESS 2011 CHINESE JOURNAL OF CHEMISTRY Vol.29 No.6
<P><B>Abstract</B></P><P>The synthesis and characterization of new transition metal complexes of Mn(II), Co(II), Ni(II), Cu(II) and Zn(II) with 3‐(2‐hydroxynaph‐1‐ylazo)‐1,2,4‐triazole (<B>HL<SUP>1</SUP></B>) and 3‐(2‐hydroxy‐3‐carboxynaph‐1‐ylazo)‐1,2,4‐triazole (<B>HL<SUP>2</SUP></B>) have been carried out. Their structures were confirmed by elemental analyses, thermal analyses, spectral and magnetic data. The IR and <SUP>1</SUP>H NMR spectra indicated that <B>HL<SUP>1</SUP></B> and <B>HL<SUP>2</SUP></B> coordinated to the metal ions as bidentate monobasic ligands via the hydroxyl O and azo N atoms. The UV‐Vis, ESR spectra and magnetic moment data revealed the formation of octahedral complexes [Mn<B>L<SUP>1</SUP></B>(AcO)(H<SUB>2</SUB>O)<SUB>3</SUB>] (<B>1</B>), [Co<B>L<SUP>1</SUP></B>(AcO)(H<SUB>2</SUB>O)<SUB>3</SUB>]·H<SUB>2</SUB>O (<B>2</B>), [Mn<B>L<SUP>2</SUP></B>(AcO)(H<SUB>2</SUB>O)<SUB>3</SUB>] (<B>6</B>) and [Co<B>L<SUP>2</SUP></B>(AcO)(H<SUB>2</SUB>O)<SUB>3</SUB>] (<B>7</B>), [Ni<B>L<SUP>1</SUP></B>(AcO)(H<SUB>2</SUB>O)] (<B>3</B>), [Zn<B>L<SUP>1</SUP></B>(AcO)(H<SUB>2</SUB>O)]·H<SUB>2</SUB>O (<B>5</B>), [Ni<B>L<SUP>2</SUP></B>(AcO)(H<SUB>2</SUB>O)] (<B>8</B>), [Zn<B>L<SUP>2</SUP></B>(AcO)(H<SUB>2</SUB>O)]·10H<SUB>2</SUB>O (<B>10</B>) have tetrahedral geometry, whereas [Cu<B>L<SUP>1</SUP></B>(AcO)(H<SUB>2</SUB>O)<SUB>2</SUB>] (<B>4</B>) and [Cu<B>L<SUP>2</SUP></B>(AcO)(H<SUB>2</SUB>O)<SUB>2</SUB>]·5H<SUB>2</SUB>O (<B>9</B>) have square pyramidal geometry.. The mass spectra of the complexes under EI‐con‐ ditions showed the highest peaks corresponding to their molecular weights, based on the atomic weights of <SUP>55</SUP>Mn, <SUP>59</SUP>Co, <SUP>58</SUP>Ni, <SUP>63</SUP>Cu and <SUP>64</SUP>Zn isotopes; besides, other peaks containing other isotopes distribution of the metal. Kinetic and thermodynamic parameters of the thermal decomposition stages were computed from the thermal data using Coats‐Redfern method. <B>HL<SUP>2</SUP></B> and complexes <B>6</B>–<B>10</B> were found to have moderate antimicrobial activities against <I>Staphylococcus aureus </I>(gram positive), <I>Escherichia coli </I>(gram negative) and <I>Salmonella </I>sp bacteria, and antifungal activity against <I>Fusarium oxysporum</I>, <I>Aspergillus niger</I> and <I>Candida albicans</I>. Also, in most cases, metallation increased the activity compared with the free ligand.</P>
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