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
[...] Read more.
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 [Ag
2(
1)
2]X
2, and two kinds of polymeric structures from a mononuclear complex, [Ag(
1)]
nX
n, and from a dinuclear complex, [Ag
2(
1)X
2]
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, Ag
I–Ag
I interactions were observed with different Ag
I–Ag
I distances which depend on the kind of counter anions and the chemical composition.
Full article