Abstract This research work presents the structural features and biological activities of a novel series of Mn/Fe/Co/Ni/Cu/Zn(II)-(indal-L-his) complexes obtained from indole-3-carboxaldehyde (indal) and L-histidine (L-his). The prepared compounds were characterized by elemental analysis, molar conductivity, magnetic, IR, UV–vis, 1H NMR, mass and ESR spectroscopies, powder XRD and TGA studies. Electronic spectra and magnetic moment data suggest an octahedral geometry for [Mn(II)-(indal-L-his)2(H2O)2] and [Fe(II)-(indal-L-his)2(H2O)2], tetrahedral geometry for [Co(II)-(indal-L-his)2] and [Zn(II)-(indal-L-his)2] and square planar geometry were assigned for [Ni(II)-(indal-L-his)2] and [Cu(II)-(indal-L-his)2]. The photocatalytic efficiency was explored for the synthesized compounds. In vitro antimicrobial activity of synthesized compounds was analyzed against some selected Gram-positive and Gram-negative bacterial and fungal species by disc diffusion technique. The compounds have shown to reveal excellent antibacterial and antifungal activity. Graphical Abstract

中文翻译：

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作为有效杀生物剂的吲哚-3-甲醛和L-组氨酸衍生的席夫碱金属配合物的合成和光谱表征

摘要 本研究工作介绍了从吲哚-3-甲醛 (indal) 和 Mn/Fe/Co/Ni/Cu/Zn(II)-(indal-L-his) 配合物获得的一系列新型 Mn/Fe/Co/Ni/Cu/Zn(II)-(indal-L-his) 配合物的结构特征和生物活性。 L-组氨酸（L-his）。制备的化合物通过元素分析、摩尔电导率、磁性、IR、UV-vis、1H NMR、质量和 ESR 光谱、粉末 XRD 和 TGA 研究进行表征。电子光谱和磁矩数据表明 [Mn(II)-(indal-L-his)2(H2O)2] 和 [Fe(II)-(indal-L-his)2(H2O)2] 的八面体几何结构, [Co(II)-(indal-L-his)2] 和 [Zn(II)-(indal-L-his)2] 的四面体几何形状和方形平面几何形状分配给 [Ni(II)-(indal -L-his)2]和[Cu(II)-(indal-L-his)2]。研究了合成化合物的光催化效率。通过圆盘扩散技术分析合成化合物对一些选定的革兰氏阳性和革兰氏阴性细菌和真菌物种的体外抗微生物活性。这些化合物已显示出优异的抗菌和抗真菌活性。图形概要