characterized. Specifically, the rare MO5N six-coordinated transitionmetal coordination modes have been detected in Co-DTMH and Ni-DTMH, while Ag atoms in Ag-DTMH exhibited three- and five-coordinated geometries with the tuning of specially selected imidazole ligands. Thus-obtained clusters can serve as powerful bifunctional catalysts for both sulfide oxidation and C—C bond construction. Remarkably, Ag-DTMH
双功能催化剂的开发在实现高效可行的催化体系以满足潜在工业应用的多样化需求方面备受关注。为各种催化系统设计稳定和强大的双功能催化剂是非常需要的,但在很大程度上尚未得到满足。在这里,通过pH调节策略成功合成了三种基于十钒酸盐的过渡金属杂化物(DTMH)(即Co-DTMH、Ni-DTMH和Ag-DTMH)并进一步表征。具体来说,稀有的 MO 5已在 Co-DTMH 和 Ni-DTMH 中检测到 N 六配位过渡金属配位模式,而 Ag-DTMH 中的 Ag 原子表现出三配位和五配位几何形状,并调整了特别选择的咪唑配体。由此获得的簇可以作为强大的双功能催化剂,用于硫化物氧化和 CC 键构建。值得注意的是,Ag-DTMH 在硫化物的选择性氧化和 CC 键的构建中表现出优异的多相双功能催化性能(产率高达 99%),能够成功回收三个循环,并保持催化活性和结构稳定性。新设计的具有双功能特性的基于十钒酸盐的过渡
Two inorganic–organic hybrid silver-polyoxometalates as reusable catalysts for one-pot synthesis of propargylamines <i>via</i> a three-component coupling reaction at room temperature
作者:Ming-Yu Dou、Xian-Qiang Huang、Guo-Yu Yang
DOI:10.1039/d0ce00042f
日期:——
Importantly, compound 1 showed high catalytic activities for the three-component coupling reaction of alkynes and secondary amines along with formaldehyde, which resulted in a series of propargylamine derivatives in higher yields (up to 99%). Furthermore, the Ag–POM catalyst was easily recovered by filtration and reused for three cycles without a significant loss in catalytic activity. A tentative mechanism
通过银络合物和Keggin POM的组合,形成了两种新型的无机-有机银-多金属氧酸盐杂化物[Ag 3 L 2(DMSO)2 ] [PW 12 O 40 ]·4DMSO(1)和[(Ag 2 L 2)2 ] [SiW 12 O 40 ]·10DMSO·2H 2 O(2)(L = 4-(2-吡啶基)-6-(4-吡啶基)-2-氨基嘧啶)被合成和表征。有趣的是,化合物1中的银原子与AgNO模型三配位;但是,化合物2的Ag原子被有机配体的四个N原子包围并显示出扭曲的四面体构型。重要的是,化合物1对炔烃和仲胺与甲醛的三组分偶联反应显示出高催化活性,从而以更高的收率(高达99%)产生了一系列炔丙基胺衍生物。此外,Ag-POM催化剂很容易通过过滤回收,并可以重复使用三个循环而不会显着降低催化活性。还为这种转换提出了一种尝试性机制。
Self-assembly of three Ag-polyoxovanadates frameworks for their efficient construction of C N bond and detoxification of simulant sulfur mustard
作者:Xianqiang Huang、Yanan Cui、Jinhong Zhou、Yalin Zhang、Guodong Shen、Qingxia Yao、Jikun Li、Zechun Xue、Guoping Yang
DOI:10.1016/j.cclet.2021.09.042
日期:2022.5
(APFs) with a controllable molar ratio of Ag+ to polyoxovanadates (POVs) [Ag(IM)2]2V4O12·2Ag(IM)2 (APF-1), [Ag2(1-eIM)4]2[Ag(1-eIM)2]3·2Ag(1-eIM)2·3(1-HeIM)[V10O28]2 (APF-2) and [Ag(1-pIM)2]3[HV10O28]·2Ag(1-pIM)2·2H2O (APF-3) (IM = imidazole; 1-eIM = 1-ethylimidazole and 1-pIM = 1-propylimidazole) have been successfully achieved by self-assembly of POVs, Ag+ cations, and three different imidazole derivatives
A 1D Cu(I)-coordination polymer [(CuL1)(CuBr2), 1] carrying external copper bromide moieties was synthesized. The outer-hanging [CuBr2]− moiety is attached to the 1D Cu(I)-CP backbone via a Cu⋯Cu bonding interaction, which makes it look like a coordination polymer supported CuBr2 species. 1 exhibits excellent multifunctional catalytic activity for phenol acetylation, A3-coupling (aldehyde–alkyne–amine)
Postsynthetic modification of metal–organic framework as a highly efficient and recyclable catalyst for three-component (aldehyde–alkyne–amine) coupling reaction
作者:Jin Yang、Pinhua Li、Lei Wang
DOI:10.1016/j.catcom.2012.06.023
日期:2012.10
A MOF-supported Cu(I) catalyst bearing N,O-chelating ligand was prepared through postsynthetic modification of IRMOF-3 and used as an efficient heterogeneous catalyst for three-componentcoupling reaction of aldehyde, alkyne, and amine. The catalyst exhibited both high catalytic activity and stability for the reaction and the framework of Cu(I) catalyst was mainly maintained after the catalyst was