Abstract
This chapter discusses the function oriented molecular design for crown ether. Knowledge on crown ether chemistry should give a basis of other host-guest systems and strategies for the design of novel supramolecular systems. The chapter describes the methods for evaluation of crown ether complexation includes calorimetric titration, conductivity measurement, electrophoresis, cation-exchange chromatography, and reverses phase liquid chromatography. It reviews the two sensing systems based on crown ethers: ion-selective electrode and optical sensors. It should be pointed out that besides the wide applications of crown ethers in molecular sensing, crown ethers have also been extensively applied in organic synthesis. The crown ethers have found more novel applications recently, in four areas, including controlling complexation by external physical field, combination with novel materials, bioapplications, and building block for novel material. Keywords: crown ethers; function oriented molecular design; chromatography; electrophoresis; molecular sensing
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