Synthesis of a new series of Ni(<scp>ii</scp>), Cu(<scp>ii</scp>), Co(<scp>ii</scp>) and Pd(<scp>ii</scp>) complexes with an ONS donor Schiff base: crystal structure, DFT study and catalytic investigation of palladium and nickel complexes towards deacylative sulfenylation of active methylenes and regioselective 3-sulfenylation of indoles <i>via</i> thiouronium salt formation
作者:Namita Devi、Kuladip Sarma、Rajjakfur Rahaman、Pranjit Barman
DOI:10.1039/c7dt04635a
日期:——
series of Ni(II), Cu(II), Co(II), and Pd(II) complexes have been synthesized with a chelating Schiff base ligand coordinated to a metal center with ONS donor atoms. The ligand and complexes are characterized by elemental analysis and spectroscopic techniques like FT-IR, 1H-NMR, and UV–Visible spectroscopy. The single crystal structure of the Pd(II) complex is obtained by X-ray diffraction analysis and
已经合成了一系列Ni(II),Cu(II),Co(II)和Pd(II)配合物,其螯合席夫碱配体与具有ONS供体原子的金属中心配位。配体和配合物的特征在于元素分析和光谱技术,例如FT-IR,1 H-NMR和UV-Visible光谱。Pd(II)配合物的单晶结构是通过X射线衍射分析获得的,呈现出略微扭曲的正方形平面几何形状。通过DFT,TD-DFT计算对结构进行了优化,以详细阐述电子结构和NBO,用于Pd(II)配合物的电荷分布分析。合成钯(II)和Ni(II)配合物作为催化剂,已在吲哚与活性亚甲基的CS交叉偶联中进行了研究。金属推动的区域选择性转化提供了3-亚磺酰化的吲哚,而β-二酮则通过硫代尿nium盐的形成以优异的产率偏爱了脱酰基的单亚磺酰基酮。Pd(II)配合物显示出更好的反应性,而Ni(II)配合物则具有成本效益。就催化剂的高反应性,使用无毒溶剂以及较便宜的芳基卤化物和硫脲替代常规的