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首页> 外文期刊>Spectrochimica acta, Part A. Molecular and biomolecular spectroscopy >Spectroscopic study of molecular structures of novel Schiff base derived from o-phthaldehyde and 2-aminophenol and its coordination compounds together with their biological activity
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Spectroscopic study of molecular structures of novel Schiff base derived from o-phthaldehyde and 2-aminophenol and its coordination compounds together with their biological activity

机译:邻苯甲醛和2-氨基苯酚及其配位化合物衍生的新型席夫碱分子结构的光谱研究及其生物学活性

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摘要

New Schiff base (H2L) ligand is prepared via condensation of o-phthaldehyde and 2-aminophenol. The metal complexes of Cr(Ill), Mn(II), Fe(II), Fe(III), Co(II), Ni(II), Cu(11) and Zn(Il) with the ligand are prepared in good yield from the reaction of the ligand with the corresponding metal salts. They are characterized based on elemental analyses, IR, solid reflectance, magnetic moment, electron spin resonance (ESR), molar conductance, 1H NMR and thermal analysis (TGA). From the elemental analyses data, the complexes are proposed to have the general formulae [M(L)(H_2O)n].yH_2O (where M = Mn(II) (n = 0,y = 1), Fe(II) (n =y= 0), Co(II) (n=2,y=O), Ni(II)(n=y=2),Cu(11) (n=0,y=2)and Zn(II)(n=y=O),and IMCI(L)(H_2O)]_yH_2O(where M = Cr(III) and Fe(III), y=1-2). The molar conductance data reveal that all the metal chelates are non-electrolytes. IR spectra show that H_2L is coordinated to the metal ions in a bi-negatively tetradentate manner with ONNO donor sites of the azomethine N and deprotonated phenolic-OH. This is supported by the ~1H NMR and ESR data. From the magnetic and solid reflectance spectra, it is found that the geometrical structures of these complexes are octahedral (Cr(III), Fe(III), Co(II) and Ni(II) complexes), tetrahedral (Mn(II), Fe(II) and Zn(II) complexes) and square planar (Cu(II) complex). The thermal behaviour of these chelates is studied and the activation thermodynamic parameters, such as, E~*, ΔH~*, ΔS~* and ΔG~* are calculated from the DrTGA curves using Coats-Redfern method. The parent Schiff base and its eight metal complexes are assayed against two fungal and two bacterial species. With respect to antifungal activity, the parent Schiff base and four metal complexes inhibited the growth of the tested fungi at different rates. Ni(II) complex is the most inhibitory metal complex, followed by Cr(III) complex, parent Schiff base then Co(II) complex. With regard to bacteria, only two of the tested metal complexes (Mn(II) and Fe(II)) weakly inhibit the growth of the two tested bacteria.
机译:新的席夫碱(H2L)配体是通过邻苯甲醛和2-氨基苯酚的缩合制备的。制备了具有配体的Cr(III),Mn(II),Fe(II),Fe(III),Co(II),Ni(II),Cu(11)和Zn(III)的金属配合物配体与相应的金属盐反应得到的产率。它们基于元素分析,红外,固体反射率,磁矩,电子自旋共振(ESR),摩尔电导,1H NMR和热分析(TGA)进行表征。从元素分析数据来看,该配合物的通式为[M(L)(H_2O)n] .yH_2O(其中M = Mn(II)(n = 0,y = 1),Fe(II)( n = y = 0),Co(II)(n = 2,y = O),Ni(II)(n = y = 2),Cu(11)(n = 0,y = 2)和Zn(II )(n = y = O)和IMCI(L)(H_2O)] _ yH_2O(其中M = Cr(III)和Fe(III),y = 1-2)。摩尔电导数据显示所有金属螯合物红外光谱表明,H_2L以双负四齿的方式与金属离子配位,与偶氮甲碱N和去质子化的酚-OH的ONNO供体位点相关,这由〜1H NMR和ESR数据支持。磁性和固体反射光谱,发现这些配合物的几何结构为八面体(Cr(III),Fe(III),Co(II)和Ni(II)配合物),四面体(Mn(II),Fe (II)和Zn(II)配合物)和方形平面(Cu(II)配合物)。研究了这些螯合物的热行为,以及活化热力学参数,如E〜*,ΔH〜*,ΔS〜*和ΔG〜*计算f使用Coats-Redfern方法从DrTGA曲线针对两种真菌和两种细菌对母体席夫碱及其八种金属配合物进行了分析。关于抗真菌活性,母体席夫碱和四种金属配合物以不同的速率抑制了测试真菌的生长。 Ni(II)络合物是最具抑制性的金属络合物,其次是Cr(III)络合物,母体Schiff碱,然后是Co(II)络合物。关于细菌,仅两种测试金属配合物(Mn(II)和Fe(II))弱抑制两种测试细菌的生长。

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