A new strategy for controlling the liquid crystalline and photophysical properties of supramolecular mesogens assembled via halogen bonding is reported. Changing the degree of fluorination at the halogen-bond donor of the supramolecular liquid crystal allows for the fine-tuning of the halogen bond strength and thereby provides control over the temperature range of the mesophase. At least three fluorine atoms have to be present to ensure efficient polarization of the halogen-bond donor and the formation of a mesophase. In addition, it was found that stilbazole acceptors are superior to their azopyridine counterparts in promoting stable liquid crystalline phases. The halogen-bond-driven supramolecular liquid crystals between fluorinated azobenzenes and stilbazole/azopyridine acceptors show a rich variety of photoinduced processes driven by azobenzene photoisomerization, dictated not only by the photochemical properties of the molecular components but also by the difference between the operation temperature and the clearing point

Saccone M., Spengler M., Pfletscher M., Kuntze K., Virkki M., Wolper C., et al. (2019). Photoresponsive Halogen-Bonded Liquid Crystals: The Role of Aromatic Fluorine Substitution. CHEMISTRY OF MATERIALS, 31(2), 462-470 [10.1021/acs.chemmater.8b04197].

Photoresponsive Halogen-Bonded Liquid Crystals: The Role of Aromatic Fluorine Substitution

Saccone M.
Supervision
;
2019-01-01

Abstract

A new strategy for controlling the liquid crystalline and photophysical properties of supramolecular mesogens assembled via halogen bonding is reported. Changing the degree of fluorination at the halogen-bond donor of the supramolecular liquid crystal allows for the fine-tuning of the halogen bond strength and thereby provides control over the temperature range of the mesophase. At least three fluorine atoms have to be present to ensure efficient polarization of the halogen-bond donor and the formation of a mesophase. In addition, it was found that stilbazole acceptors are superior to their azopyridine counterparts in promoting stable liquid crystalline phases. The halogen-bond-driven supramolecular liquid crystals between fluorinated azobenzenes and stilbazole/azopyridine acceptors show a rich variety of photoinduced processes driven by azobenzene photoisomerization, dictated not only by the photochemical properties of the molecular components but also by the difference between the operation temperature and the clearing point
Settore CHIM/07 - Fondamenti Chimici Delle Tecnologie
Saccone M., Spengler M., Pfletscher M., Kuntze K., Virkki M., Wolper C., et al. (2019). Photoresponsive Halogen-Bonded Liquid Crystals: The Role of Aromatic Fluorine Substitution. CHEMISTRY OF MATERIALS, 31(2), 462-470 [10.1021/acs.chemmater.8b04197].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10447/398742
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