A series of diarylethenes with substituents of different size and chemical nature was synthesised showing that beside some intermolecular interactions involving the central diarylethene core, lateral groups clearly play a key role in the crystal packing arrangements. These structural features were further analyzed in relation to the thermal data obtained by differential scanning calorimetry (DSC) and monitored using FT-IR spectroscopy, thus providing a rationalization of the observed thermal transitions processes. The role of van der Waals interactions is crucial in driving crystal packing formation towards loosely packed arrangements characterized by large hydrophobic contact areas. Interestingly, some functional substituents favour an amorphous state after thermal treatment, a peculiar feature that can be exploited to design uniform photochromic layers. (C) 2016 Elsevier B.V. All rights reserved.
Rossella Castagna, Valentina Nardone, Giorgio Pariani, Emilio Parisini, Andrea Bianco (2016). The interplay of soft-hard substituents in photochromic diarylethenes. JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY. A, CHEMISTRY, 325, 45-54 [10.1016/j.jphotochem.2016.04.001].
The interplay of soft-hard substituents in photochromic diarylethenes
Emilio Parisini;
2016
Abstract
A series of diarylethenes with substituents of different size and chemical nature was synthesised showing that beside some intermolecular interactions involving the central diarylethene core, lateral groups clearly play a key role in the crystal packing arrangements. These structural features were further analyzed in relation to the thermal data obtained by differential scanning calorimetry (DSC) and monitored using FT-IR spectroscopy, thus providing a rationalization of the observed thermal transitions processes. The role of van der Waals interactions is crucial in driving crystal packing formation towards loosely packed arrangements characterized by large hydrophobic contact areas. Interestingly, some functional substituents favour an amorphous state after thermal treatment, a peculiar feature that can be exploited to design uniform photochromic layers. (C) 2016 Elsevier B.V. All rights reserved.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
