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Large Molecular Cavities for Small Ions—Double Bridging of Three Bipyridine Units
Author(s) -
Grammenudi Smaragda,
Vögtle Fritz
Publication year - 1986
Publication title -
angewandte chemie international edition in english
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 0570-0833
DOI - 10.1002/anie.198611221
Subject(s) - octahedron , ion , crystallography , chemistry , bridging (networking) , ligand (biochemistry) , bridging ligand , bipyridine , stereochemistry , inorganic chemistry , crystal structure , receptor , organic chemistry , computer science , computer network , biochemistry
Nearly octahedral coordination of cations has been achieved with the novel ligand 1 . A prime example of such a complex is 1 . Fe 2⊕ ; its red color is so intense that the complex may prove useful for colorimetric Fe 2⊕ determination. Fe 3⊕ , Co 2⊕ , Ni 2⊕ , Cu 2⊕ , and Cu ⊕ , on the other hand, give colorless solutions. Competition experiments show that 1 ·Fe 2⊕ is much more stable than open‐chain analogues. For example, even a 1000‐fold excess of EDTA is not able to release the iron from 1 ·Fe 2⊕ (Rbenzyl).