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The challenge of cyclic and acyclic schiff bases and related derivatives

机译：环状和非环状席夫碱及其相关衍生物的挑战

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摘要

The use of planar or tridimensional cyclic and acyclic Schiff bases, their polyamine homologues and related derivatives, for the formation of mononuclear and especially polynuclear complexes, is reported. Attention is devoted to the synthetic pathways and to the structural aspects of the resulting systems, particularly the role of the shape of the coordinating ligands and of the different metal ions in directing the synthesis totally or preferentially towards mono-, di- or poly-nuclear entities. Special care is paid to compartmental ligands, owing to their ability to bind two or more metal ions in close proximity. The insertion of asymmetry into these ligands provides important diversification of the coordinating sites and allows for different and well defined recognition processes involving specific ions and/or molecules at the adjacent coordinating sites. New molecular materials, devices and probes for specific recognition and detection in the solid state or solution take advantage of the presence of different metal ions at appropriate distances from each other in a preordered stereochemical environment with variation of oxidation state, magnetic, optical and redox properties. Such polynuclear systems can exhibit unusual reactivity or catalysis.
机译：据报道，使用平面或三维环状和无环的席夫碱，它们的多胺同系物和相关衍生物来形成单核，尤其是多核配合物。注意合成途径和所得系统的结构方面，特别是配位体的形状和不同金属离子在完全或优先将合成导向单，双或多核方面的作用。实体。由于隔室配体能够紧密结合两个或多个金属离子，因此应格外小心。在这些配体中不对称的插入提供了配位点的重要多样化，并允许涉及相邻配位点处的特定离子和/或分子的不同且定义明确的识别过程。用于在固态或溶液中进行特定识别和检测的新型分子材料，设备和探针，利用了在预定的立体化学环境中彼此相距适当距离的不同金属离子的存在，这些金属离子具有氧化态，磁性，光学和氧化还原特性的变化。这样的多核系统可能表现出异常的反应性或催化作用。

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