Hydrazone-based switches, metallo-assemblies and sensors
2014
Su, Xin | Aprahamian, Ivan
The hydrazone functional group has been extensively studied and used in the context of supramolecular chemistry. Its pervasiveness and versatility can be attributed to its ease of synthesis, modularity, and most importantly unique structural properties, which enable its integration in different applications. This review provides an overview of the utilization of hydrazones in three supramolecular chemistry related areas: molecular switches, metallo-assemblies and sensors. These topics were chosen because they highlight the diversity of hydrazones, and emphasize their uniqueness vis-à-vis the imine functional group. Discussion entails (i) chemical and light activated switching of hydrazones, and how this can be used in controlling the properties of self-assembled systems, (ii) the use of hydrazones in the formation of dynamic and stimuli responsive metallogrids, and (iii) the use of hydrazones in detecting metal cations (Zn²⁺, Cu²⁺, Hg²⁺, etc.), anions (F⁻, CN⁻, P₂O₇⁴⁻, etc.) and neutral molecules (amines, water, Cys, etc.).
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