Abstract Four new mononuclear Schiff base manganese(III) and cobalt(III) complexes viz. [Mn(L1)(NCS)] (1), [Mn(L2)(NCS)] (2), [Co(L3)(NCS)] (3), and [Co(L4)(NCS)]·0.5CH3OH·0.5H2O (4), containing thiocyanate as a common pseudohalide ion are reported. The pentadentate Schiff base ligands H2L1, H2L2, H2L3, and H2L4 were obtained by the condensation of substituted salicylaldehydes with N-(3-aminopropyl)-N-methylpropane-1,3-diamine. The syntheses of the complexes have been achieved by the reaction of manganese(II) perchlorate or cobalt(II) perchlorate with the respective Schiff bases in the presence of thiocyanate in methanol medium. Complexes 1–4 have been characterized by microanalytical, spectroscopic, single-crystal X-ray diffraction and other physicochemical studies. Structural studies reveal that 1–4 adopt nearly similar structures containing the MN4O2 (M = Mn, Co) chromophore in which each central M(III) ion adopts a distorted octahedral geometry. Weak intermolecular H-bonding interactions are operative in these complexes to bind the molecular units. The antibacterial activity of 1–4 and their constituent Schiff bases has been tested against some common bacteria. Graphical Abstract

中文翻译：

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含有普通胺和硫氰酸盐五齿席夫碱的锰(III)和钴(III)配合物的合成、晶体结构和抗菌活性

摘要 四种新的单核席夫碱锰(III)和钴(III)配合物即。[Mn(L1)(NCS)] (1)、[Mn(L2)(NCS)] (2)、[Co(L3)(NCS)] (3) 和 [Co(L4)(NCS)]·据报道，0.5CH3OH·0.5H2O (4) 中含有硫氰酸根作为常见的拟卤离子。五齿席夫碱配体 H2L1、H2L2、H2L3 和 H2L4 通过取代水杨醛与 N-(3-氨基丙基)-N-甲基丙烷-1,3-二胺缩合获得。配合物的合成是通过高氯酸锰 (II) 或高氯酸钴 (II) 与各自的席夫碱在硫氰酸盐存在下在甲醇介质中反应来实现的。配合物 1-4 已通过微量分析、光谱、单晶 X 射线衍射和其他物理化学研究进行表征。结构研究表明，1-4 采用几乎相似的结构，其中包含 MN4O2 (M = Mn, Co) 发色团，其中每个中心 M(III) 离子采用扭曲的八面体几何形状。弱分子间氢键相互作用在这些复合物中起作用以结合分子单元。1-4 及其组成的席夫碱的抗菌活性已针对一些常见细菌进行了测试。图形概要