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Selective oxidation of benzyl alcohols to benzaldehydes catalyzed by dioxomolybdenum Schiff base complex: synthesis, spectral characterization, crystal structure, theoretical and computational studies
Transition Metal Chemistry ( IF 1.7 ) Pub Date : 2021-05-06 , DOI: 10.1007/s11243-021-00460-w
Hadi Kargar , Mehdi Fallah-Mehrjardi , Reza Behjatmanesh-Ardakani , Khurram Shahzad Munawar , Muhammad Ashfaq , Muhammad Nawaz Tahir

A novel dioxomolybdenum Schiff base complex, MoO2L·DMF, was synthesized by treating MoO2(acac)2 with an ONO donor Schiff base ligand (H2L) derived by the condensation of 4-aminobenzohydrazide and 3-methoxysalicylaldehyde. The synthesized ligand and complex were characterized by physicochemical and spectroscopic techniques. Single-crystal X-ray analysis was also accomplished to ensure the molecular structure of the complex. The geometry around the central metal atom in MoO2L·DMF was distorted octahedral as revealed by the data collected from diffraction studies. Theoretical calculations of the synthesized compounds were carried out by DFT at B3LYP/Def2-TZVP level of theory, which showed a good correlation with the experimental findings. Moreover, the homogeneous catalytic efficiency of the complex was investigated by the process of selective oxidation of benzylic alcohols using urea hydrogen peroxide (UHP) in acetonitrile under reflux conditions.



中文翻译:

二氧钼钼席夫碱配合物催化苯甲醇选择性氧化为苯甲醛的合成,光谱表征,晶体结构,理论和计算研究

通过用由4-氨基苯甲酰肼与3-甲氧基水杨醛缩合而得的ONO供体席夫碱配体(H 2 L)处理MoO 2(acac)2来合成新型二氧钼席夫碱配合物MoO 2 L·DMF 。合成的配体和配合物通过物理化学和光谱技术进行表征。还完成了单晶X射线分析,以确保配合物的分子结构。MoO 2中中心金属原子周围的几何从衍射研究中收集到的数据表明,L·DMF的八面体变形。DFT在B3LYP / Def2-TZVP的理论水平上对合成化合物进行了理论计算,与实验结果具有良好的相关性。此外,通过在回流条件下使用过氧化氢尿素(UHP)在乙腈中选择性氧化苄醇的方法,研究了配合物的均相催化效率。

更新日期:2021-05-06
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