220593-43-1Relevant articles and documents
A convenient and effective synthesis of tris-bridged tricationic azolophanes
Yuan,Jiang,Yan,Gao,Chan,Xie
, p. 4555 - 4561 (2000)
Two new macrobicyclic imidazolium and benzimidazolium phanes were synthesized by direct quaternization of the corresponding tripodal azacycles with tribromide under high dilution condition in excellent yields. The cyclophanes were identified by 1/su
Structural examination of halogen-bonded co-crystals of tritopic acceptors
Andree, Stefan N. L.,Sinha, Abhijeet S.,Aaker y, Christer B.
, (2018/01/18)
A series of tritopic N-heterocyclic compounds containing electrostatically and geometrically equivalent binding sites were synthesized and subjected to systematic co-crystallizations with selected perfluoroiodoarenes in order to map out their structural landscapes. More than 70% of the attempted reactions produced a co-crystal as indicated by IR spectroscopy. Four new crystal structures are reported and in all of them, at least one potential binding site on the acceptor is left vacant. The absence of halogen bonds to all sites can be ascribed primarily due to deactivation of the σ-hole on the iodo-arene donors and partially due to steric hindrance. The tritopic acceptors containing 5,6-dimethylbenzimidazole derivatives yield discrete tetrameric aggregates in the solid state, whereas the pyrazole and imidazole analogues assemble into halogen-bonded 1-D chains.
