Conformational dynamics of a bispyridinium cyclophane.
A complete study of the conformational behavior of 4,8-diaza-3(1,4),9(4,1)-dipyridina-1,6(1,4)-dibenzenacyclodecaphan-3(1),9(1)-bis(ilium) bishexafluorophosphate is described. This study allows us to conclude that the process observed by which the different chemical shifts of the pyridinium protons show coalescence at a high-temperature 1H NMR is the rotation around the C-N bond, whereas the conformational equilibrium between the four conformers is produced at low temperature.
Departamento de Química Farmacéutica y Orgánica, Facultad de Farmacia, c/ Campus de Cartuja s/n, 18071 Granada, Spain aespinos@ugr.es
Ana
A
Conejo-García
Joaquín M
JM
Campos
Antonio
A
Entrena
Rosario M
RM
Sánchez-Martín
Miguel A
MA
Gallo
Antonio
A
Espinosa