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首页> 外文期刊>Advanced Functional Materials >Ultrathin Luminescent Films of Rigid Dinuclear Ruthenium(Ⅱ) Trisbipyridine Complexes
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Ultrathin Luminescent Films of Rigid Dinuclear Ruthenium(Ⅱ) Trisbipyridine Complexes

机译：刚性双核钌（Ⅱ）三联吡啶配合物的超薄发光膜

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摘要

Two asymmetric, luminescent, bimetallic ruthenium trisbipyridine complexes with the general formula [Ru(bpy)_3-ph_4-Ru(bpy) L_2](PF_6)_4 (bpy = 2,2'-bipyridine, ph = phenyl, L=4,4'-di-n-undecyl-2,2'-bipyridine (1); 4,4'-di-non-1-enyl-2,2'-bipyridine (2)) have been synthesized and characterized. The introduction of two 4,4'-dialkyl-2,2'-bipyridine ligands on one of the ruthenium centers does not influence the electronic structure of the overall complexes to a large extent. Owing to the hydrophobic and hydrophilic nature of the two terminal metal complexes, the compounds 1 and 2 are expected to form Langmuir monolayers at the air/water interface. The film-forming properties of the amphiphilic complexes have been investigated by measuring surface-pressure-molecular-area (π-A) isotherms and recording Brewster-angle microscopy images. Complexes 1 and 2 were shown to form monolayer films at the air/water interface, which have subsequently been transferred to solid substrates using the Lang-muir-Blodgett (LB) technique. The homogeneity of the resulting LB films has been investigated using atomic force microscopy and has been compared with that of LB films of the reference compound [Ru(bpy)_3-ph_4-Ru(bpy)_3](PF_6)_4 (3), which lacks the alkyl chains. The presence of the hydrocarbon chains on one side of the rigid bimetallic complexes was shown to be a prerequisite for the formation of homogeneous monolayers, as with 3 only multilayer formation was obtained. Confocal laser scanning microscopy measurements proved that the LB films of complexes 1 and 2 display a homogeneous red emission upon photoexci-tation. Such important results represent the first step towards the fabrication of mono- or few-molecular-layer electroluminescent devices.
机译：具有通式[Ru（bpy）_3-ph_4-Ru（bpy）L_2]（PF_6）_4（bpy = 2,2'-bipyridine，ph =苯基，L = 4，的两个不对称发光双金属钌三联吡啶配合物，已经合成并表征了4'-二-正十一烷基-2,2'-联吡啶（1）； 4,4'-二-非-1-烯基-2,2'-联吡啶（2）。在钌中心之一上引入两个4,4'-二烷基-2,2'-联吡啶配体不会在很大程度上影响整体配合物的电子结构。由于两种末端金属配合物的疏水性和亲水性，预期化合物1和2在空气/水界面处形成Langmuir单层。通过测量表面压力-分子面积（π-A）等温线并记录布鲁斯特角显微镜图像，已经研究了两亲络合物的成膜性能。配合物1和2已显示在空气/水界面处形成单层膜，随后使用Lang-muir-Blodgett（LB）技术将其转移到固体基质上。已使用原子力显微镜研究了所得LB膜的均匀性，并将其与参考化合物[Ru（bpy）_3-ph_4-Ru（bpy）_3]（PF_6）_4的LB膜的均匀性进行了比较（3），缺少烷基链。硬质双金属配合物一侧的烃链被证明是形成均质单层的前提条件，因为只有3个可以形成多层。共聚焦激光扫描显微镜测量证明，配合物1和2的LB膜在光激发后显示出均匀的红色发射。这样重要的结果代表了制造单分子层或少分子层电致发光器件的第一步。

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