Data: 07 de Outubro de 2024

 

Horário: 16h

 

Palestrante: Prof. Dr. Robert Hein – University of Munster

 

Local: Anfiteatro “Prof. Edson Rodrigues” – Instituto de Química de São Carlos, Edifício Q1 – Térreo

 

Resumo:

“Molecular switches are highly sought after to enable the reversible modulation of various molecular properties such as electronic structure, charge or conformation, which facilitates numerous applications in sensing, (opto)electronics, energy storage or molecular machines. Herein, a range of dynamic redox switches, which undergo a secondary (switching) process following a redox event, will be discussed. This includes redox-active supramolecular hosts in which various non-covalent interactions, such as hydrogen, halogen or chalcogen bonding can be judiciously turned ON or OFF, thereby reversible taking up, or ejecting, an ionic guest. This enables the construction of redox-switchable ion receptors which also serve as powerful electrochemical sensors. For example, their integration into self-assembled monolayers enables highly tunable, sensitive, real-time, continuous flow ion sensing. Additionally, redox-driven conformational switches based on overcrowded alkenes, such as bisthioxanthylidenes, will be discussed. These systems undergo significant geometric changes following redox stimulation, which is also associated with highly reversible and pathway-dependent multi-state switching of color, fluorescence, polarity, geometry and (anti)aromaticity.”