Inclusion properties, polymorphism and desolvation kineticsin a new 2-pyridyl iminophenol compound with 1D nano-channels

The syntheses, crystal structures and solid-state inclusion properties of 3- and 2-pyridyl 3,5-diphenyl-4-hydroxy iminophenols are reported. Their solid-state organization is based oil supramolecular head-to-tail chains sustained by O-H center dot center dot center dot N hydrogen bonds. It is shown that the position of the pyridinic nitrogen is crucial to determine the inclusion propensity. Although formation of nonsolvated close packed networks is observed for both compounds, the 2-pyridyl iminophenol derivative is also able to form nanochannels hosting arrays of guest molecules (toluene, acetone, chloroform). Most interestingly the toluene solvate occurs ill two concomitant polymorphs, presenting different channel arrangements, whose properties are Studied also by means of high-pressure X-ray diffraction. Thermal analyses arc used to determine the kinetics of desolvation of all solvates, whose thermal behavior is correlated with their supramolecular structures.