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Host Guest Complex Chemistry Macrocycles - Synthesis, Structures, Applications (Paperback, Softcover reprint of the original 2nd ed. 1985)
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Host Guest Complex Chemistry Macrocycles - Synthesis, Structures, Applications (Paperback, Softcover reprint of the original 2nd ed. 1985)
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The scientific and practical interest in coronands (crown ethers),
cryptands, podands as complexing agents for cations as well as for
anions and neutral low molecular species is undeniable 1,2). The
chemistry of crown compounds is steadily increasing. About 250
original papers dealing with crown chemistry appeared only in 1980.
New molecules. with crown ether properties are constantly
synthesized and new applications discov, ?red. Owing to lack of
space, only a small number of the original publications is men
tioned here. Thus, in the literature compilation only some, but
relevant works are selected for each chapter. Whenever possible,
reference is made to reviews or review-like articles alone by means
of which origin, al works can be consulted. The reviews given under
ref. 1) are considered to be the most relevant. The formulae
presented in the figures should be understood as representative
structures outlining a specific field. 2 Classification of
Oligo-/Multidentate Neutral Ligands and of their Complexes Today, a
distinction is made between the classical ring oligoethers (crown
ethers) and monocyclic coronands, oligocyclic spherical cryptands
and the acyclic podands with respect to topological aspects 3).
This classification and the topology are illustrated in Fig. 1,
each figure representing the minimum number of donor atoms and
chain segments characteristic of each class of compounds.
Multidentate mono cyclic ligands with any type of donor atoms are
called coronands ("crown compounds"), while the term crown ether
should be reserved for cyclic oligoethers exclusively containing
oxygen as donor atom."
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