Self-assembled half-sandwich Ir, Rh-based organometallic molecular boxes for reversible trapping of halocarbon molecules
作者:Ying-Feng Han、Yue Fei、Guo-Xin Jin
DOI:10.1039/b925098k
日期:——
Reactions of [Cp*MCl(μ-Cl)]2 (M = Ir or Rh) with 6,11-dihydroxy-5,12-naphthacenedione (H2DHNA) in the presence of base, gave the corresponding binuclear complexes [Cp*2M2(μ-DHNA)Cl2] (M = Ir (1a); M = Rh (1b)), respectively. Treatment of 1a or 1b with bidentate ligands (L) such as pyrazine, 4,4′-dipyridine (bpy), E-1,2-bis(4-pyridyl)ethene (bpe) or 2,5-bis(4-pyridyl)-1,3,5-oxadiazole (bpo) in the presence of AgOTf (OTf = CF3SO3) in CH3OH, gave the corresponding tetranuclear complexes, general formula [Cp*4M4(μ-DHNA)2(μ-L)2](OTf)4 (3a, 4a, 5a, 6a: M = Ir; 3b, 4b, 5b, 6b: M = Rh), respectively. X-Ray analyses of 3a, 3b, 4a, 4b, 5a and 5b revealed that each of the half-sandwich metal centers was connected by pyridyl ligands and bis-bidentate bridging ligands to construct a rectangular cavity with different dimensions, and strong π–π interactions between independent molecules to form rectangular channels in the solid-state. Complexes 3a and 3b based on H2DHNA and pyrazine spacing ligands were found to exhibit selective and reversible small organic molecules adsorption properties. The example of C–H⋯Cl interactions served as a template by an interacted layer of monomeric complex for the creation of intercalated supramolecular arrays has been studied.
用碱处理[ Cp * MCl(μ-Cl)]2 (M = Ir 或 Rh)与6,11-二羟基-5,12-萘酮(H2DHNA)反应,得到相应的双核络合物[ Cp * 2M2(μ-DHNA)Cl2](M = Ir (1a); M = Rh (1b))。将1a或1b与双齿配体(L),如吡嗪、4,4'-二吡啶(bpy)、E-1,2-双(4-吡啶)乙烯(bpe)或2,5-双(4-吡啶)-1,3,5-噁二唑(bpo)在CH3OH中与AgOTf(OTf = CF3SO3)一起处理,得到相应的四核络合物,通式为[ Cp * 4M4(μ-DHNA)2(μ-L)2](OTf)4 (3a, 4a, 5a, 6a: M = Ir; 3b, 4b, 5b, 6b: M = Rh)。对3a、3b、4a、4b、5a和5b的X射线分析表明,每个半三明治金属中心通过吡啶配体和双双齿桥联配体连接,构建出具有不同尺寸的矩形腔体,并且独立分子之间强烈的π-π相互作用形成了固态中的矩形通道。基于H2DHNA和吡嗪间隔配体的络合物3a和3b显示出选择性和可逆的小有机分子吸附特性。作为与单体络合物相互作用层的模板,C–H⋯Cl相互作用的例子被研究用于创建嵌插超分子阵列。