Palladium(II) complexes of N-(pyridin-2-yl)-1,2-azol-3-carboxamide derived NNN-pincer ligands: Synthesis, unusual complexation and high-turnover catalysis in water

IF 2.4 3区化学 Q2 CHEMISTRY, INORGANIC & NUCLEAR

Polyhedron Pub Date : 2024-10-10 DOI:10.1016/j.poly.2024.117249

Nikolay A. Bumagin , Irina A. Kolesnik , Vladimir I. Potkin , Evgeniy A. Dikusar , Alexander S. Lyakhov , Ludmila S. Ivashkevich , Hongwei Zhou , Wenliang Li

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Abstract

Synthesis, characterization, and catalytic activity of palladium(II) complexes containing tridentate N-(pyridin-2-yl)-1,2-azol-3-carboxamide ligands with various length amide linkers [CONH(CH₂)_n, n = 0,1,2] is reported. Complexation of previously undescribed mixed pyridin-azol-carboxamide ligands with PdCl₂ occurs unusually by deprotonation of the amide group and elimination of HCl affording the palladium(II) pincer complexes [(k³-NNN)PdCl]_n (n = 1, 2), which was proven by single crystal X-ray diffraction. The first time synthesized complexes are high-turnover catalysts, as was shown during the evaluation in Suzuki reaction between aryl halides and arylboronic acids: substituted biaryls, including practically significant, were obtained with up to quantitative yields under Green Chemistry conditions.

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N-(吡啶-2-基)-1,2-偶氮唑-3-甲酰胺衍生 NNN-钳配体的钯(II)配合物：合成、不寻常络合和水中高周转催化作用

报告了含有三叉 N-(吡啶-2-基)-1,2-氮唑-3-甲酰胺配体和不同长度酰胺连接体 [CONH(CH2)n, n = 0,1,2] 的钯（II）配合物的合成、表征和催化活性。以前未曾描述过的吡啶-偶氮唑-3-甲酰胺混合配体与 PdCl2 的络合异常地通过酰胺基团的去质子化和 HCl 的消除而发生，从而得到钯（II）钳形配合物 [(k3-NNN)PdCl]n (n = 1, 2)，单晶 X 射线衍射证明了这一点。在芳基卤化物和芳基硼酸的铃木反应中进行的评估表明，首次合成的配合物是一种高转化率催化剂：在绿色化学条件下，得到的取代双芳基（包括实际上重要的取代双芳基）的产率高达定量。

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来源期刊

Polyhedron 化学-晶体学

CiteScore

4.90

自引率

7.70%

发文量

515

审稿时长

2 months

期刊介绍： Polyhedron publishes original, fundamental, experimental and theoretical work of the highest quality in all the major areas of inorganic chemistry. This includes synthetic chemistry, coordination chemistry, organometallic chemistry, bioinorganic chemistry, and solid-state and materials chemistry. Papers should be significant pieces of work, and all new compounds must be appropriately characterized. The inclusion of single-crystal X-ray structural data is strongly encouraged, but papers reporting only the X-ray structure determination of a single compound will usually not be considered. Papers on solid-state or materials chemistry will be expected to have a significant molecular chemistry component (such as the synthesis and characterization of the molecular precursors and/or a systematic study of the use of different precursors or reaction conditions) or demonstrate a cutting-edge application (for example inorganic materials for energy applications). Papers dealing only with stability constants are not considered.