Crystal Engineering through Halogen Bonding: Complexes of Nitrogen Heterocycles with Organic Iodides
Cryst. Growth Des. 2001, 1, 165
R. B. Walsh, C. W. Padgett, P. Metrangolo, G. Resnati, T. W. Hanks, W. T. Pennington
Single crystal X-ray structure of the halogen-bonded complex between 4,4
Single crystal X-ray structure of the halogen-bonded complex between 4,4'-bis-pyridil-ethane and 1,4-dibromotetrafluorobenzene.
ABSTRACT
X-ray analysis has revealed that 4,4?-bipyridine, 1,2-bis(4-pyridyl)ethylene, and hexamethylenetetramine form donor-acceptor complexes with 1,4-diiodobenzene, 1,4 diiodotetrafluorobenzene, and tetraiodoethylene wherein the N···I distances are longer than the ones for corresponding I2 complexes. Steric and electronic effects influence the strength of the N···I interaction and the crystal packing. An additional complex of 1,2-bis(4-pyridyl)ethane and 1,4-dibromotetrafluorobenzene has also been investigated for comparison of N···I and N···Br interactions.