Short, strong halogen bonding in co-crystals of pyridyl bis-urea macrocycles and iodoperfluorocarbons
作者:Michael F. Geer、James Mazzuca、Mark D. Smith、Linda S. Shimizu
DOI:10.1039/c3ce41413b
日期:——
Co-crystals formed from pyridyl bis-urea macrocycles and iodopentafluorobenzene or diiodotetrafluoroethane show surprisingly short, strong halogen bonds. The shortest interactions were observed between the carbonyl oxygen and the iodide and were 78% of the sum of the van der Waals radii for O⋯I, with distances ranging from 2.719(2) to 2.745(2) Å.
Alkali Metal Ions As Probes of Structure and Recognition Properties of Macrocyclic Pyridyl Urea Hosts
作者:Kinkini Roy、Chun Wang、Mark D. Smith、Perry J. Pellechia、Linda S. Shimizu
DOI:10.1021/jo1009596
日期:2010.8.20
one-pot synthesis of three symmetrical macrocyclic pyridyl urea hosts. X-ray crystal studies were used to confirm the structures of the free hosts and their host·guest complexes with alkali metal ions. These solid-state studies revealed the interactions that were important for binding cations (Li+, Na+, and K+). The affinity of these hosts for alkali metal salts were evaluated in solution (CD3CN), and