title: Discrete and polymeric, mono- and dinuclear silver complexes of a macrocyclic tetraoxime ligand with AgI-AgI interactions.
abstract: Macrocyclic compounds that can bind cationic species efficiently and selectively with their cyclic cavities have great potential as excellent chemosensors for metal ions. Recently, we have developed a tetraoxime-type tetraazamacrocyclic ligand 1 formed through a facile one-pot cyclization reaction. Aiming to explore and bring out the potential of the tetraoxime macrocycle 1 as a chelating sensor, we report herein the preparation of several kinds of silver complexes of 1 and their unique coordination structures determined by single-crystal X-ray diffraction analyses. As a result, the formation of two kinds of discrete structures, monomeric complexes [Ag(1)X] (X = counter anions) and a dimeric complex [Ag2(1)2]X2, and two kinds of polymeric structures from a mononuclear complex, [Ag(1)]nXn, and from a dinuclear complex, [Ag2(1)X2]n, was demonstrated. In the resulting complexes, the structurally flexible macrocyclic ligand 1 was found to provide several different coordination modes. Notably, in some silver complexes of 1, AgI-AgI interactions were observed with different AgI-AgI distances which depend on the kind of counter anions and the chemical composition.
authors: Department of Chemistry, Graduate School of Science, the University of Tokyo, Tokyo, Japan. tashiro@chem.s.u-tokyo.ac.jp
authors: Shohei
authors: S
authors: Tashiro
authors: Jun-ichiro
authors: J
authors: Tanihira
authors: Mihoko
authors: M
authors: Yamada
authors: Mitsuhiko
authors: M
authors: Shionoya
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