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By Dr. Edwin Weber, Prof. Dr. Fritz Vögtle (auth.), Professor Dr. Fritz Vögtle, Dr. Edwin Weber (eds.)

The medical and useful curiosity in coronands (crown ethers), cryptands, podands as complexing brokers for cations in addition to for anions and impartial low molecular species is indisputable 1,2). The chemistry of crown compounds is gradually expanding. approximately 250 unique papers facing crown chemistry seemed merely in 1980. New molecules· with crown ether homes are continually synthesized and new purposes discov,?red. as a result of loss of area, just a small variety of the unique guides is males­ tioned right here. therefore, within the literature compilation just some, yet correct works are chosen for every bankruptcy. at any time when attainable, reference is made to stories or review-like articles by myself through which origin,al works might be consulted. The experiences given lower than ref. 1) are thought of to be the main correct. The formulae provided within the figures could be understood as consultant constructions outlining a selected box. 2 category of Oligo-/Multidentate impartial Ligands and in their Complexes at the present time, a contrast is made among the classical ring oligoethers (crown ethers) and monocyclic coronands, oligocyclic round cryptands and the acyclic podands with admire to topological features 3). This class and the topology are illustrated in Fig. 1, every one determine representing the minimal variety of donor atoms and chain segments attribute of every classification of compounds. Multidentate mono­ cyclic ligands with any kind of donor atoms are referred to as coronands ("crown compounds"), whereas the time period crown ether could be reserved for cyclic oligoethers solely containing oxygen as donor atom.

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