Synthesis, Characterization, Biological Activity and Quantum Chemical Calculations of New Oxadiazole Derivatives
作者:International Marshes Research Center、samia Merdas
DOI:10.21608/ejchem.2021.101574.4720
日期:2021.11.15
The two ligands (E)-3-(2-(5-(2-(5-(2-hydroxyphenyl)-1,3,4-oxadiazol-2-yl)hydrazineyl)-1,3,4-thiadiazol-2-yl) hydrazineylidene)indolin-2-one (L1) ,(E)-5-(5-(2-(5-(2-((1H-pyrrol-2-yl)methylene hydrazinyl)-1,3,4-thiadiazol-2-yl)hydrazinyl)- 1,3,4-oxadiazol-2-y1) benzene-1,2,3-triol (L2) and their Fe(III) and Ni(II) complexes were synthesized by addition and elimination reactions .The ligands and their complexes characterized by spectroscopic methods (FTIR , 1H-NMR , MS ). The ligand acts as a bidentate ligand coordinating through the nitrogen atom of the oxadiazole ring and the nitrogen atom of amino group. This view is further supported by the appearance of a band corresponding to the metal-nitrogen and vibration at 454–688 cm–1 and 314-466 cm-1 in the complexes respectively. The magnetic studies suggest a octahedral and square planar geometry of the complexes. The complex of Fe (III) have shown octahedral geometry, the complex of Ni (II) has shown square planar geometry with prepared ligands. HOMO-LUMO molecular orbitals analysis of these ligands (L1,L2) and some quantum chemical parameters derived from frontier molecular orbitals were studied. The new ligands and their complexes has shown moderate to good activity against three type fungi .
通过加成和消除反应合成了(E)-5-(2-(5-(2-((1H-吡咯-2-基)亚甲基肼基)-1,3,4-噻二唑-2-基)肼基)-1,3,4-恶二唑-2-基)苯-1,2,3-三醇(L2)及其 Fe(III) 和 Ni(II) 复合物。配体及其配合物通过光谱方法(傅立叶变换红外光谱、1H-核磁共振、质谱)进行表征。配体通过噁二唑环的氮原子和氨基的氮原子配位,是一种双齿配体。配合物中分别在 454-688 cm-1 和 314-466 cm-1 处出现了与金属氮和振动相对应的条带,进一步证实了这一观点。磁性研究表明,这些配合物具有八面体和方形几何结构。铁 (III) 复合物呈八面体几何形状,镍 (II) 复合物与配体呈方形几何形状。研究了这些配体的 HOMO-LUMO 分子轨道分析(L1,L2)以及从前沿分子轨道得出的一些量子化学参数。新配体及其配合物对三种真菌具有中等到良好的活性。