Category: bromides-buliding-blocksIn 2021 ,《Three-State Switching of an Anthracene Extended Bis-thiaxanthylidene with a Highly Stable Diradical State》 was published in Journal of the American Chemical Society. The article was written by Wonink, Marco B. S.; Corbet, Brian P.; Kulago, Artem A.; Boursalian, Gregory B.; de Bruin, Bas; Otten, Edwin; Browne, Wesley R.; Feringa, Ben L.. The article contains the following contents:
A multistable mol. switching system based on an anthracene-extended bis-thiaxanthylidene with three individually addressable states that can be interconverted by electrochem., thermal, and photochem. reactions is reported. Besides reversible switching between an open-shell diradical- and a closed-shell electronic configuration, our findings include a third dicationic state and control by multiple actuators. This dicationic state with an orthogonal conformation can be switched electrochem. with the neutral open-shell triplet state with orthogonal conformation, which was characterized by EPR. The remarkably stable diradical shows kinetic stability as a result of a significant activation barrier for isomerization to a more stable neutral closed-shell folded geometry. We ascribe this activation barrier of ΔG(293 K) = 25.7 kcal mol-1 to steric hindrance in the fjord region of the overcrowded alkene structure. The folded closed-shell state can be converted back to the diradical state by irradiation with 385 nm. The folded state can also be oxidized to the dicationic state. These types of mols. with multiple switchable states and in particular stable diradicals show great potential in the design of new functional materials such as memory devices, logic gates, and OFETs. In the experiment, the researchers used many compounds, for example, 9,10-Dibromoanthracene(cas: 523-27-3Category: bromides-buliding-blocks)
9,10-Dibromoanthracene(cas: 523-27-3) is a dibrominated polycyclic aromatic hydrocarbon (PAH). 9,10-Dibromoanthracene is often used as an energy acceptor and activator in reactions that produce chemiluminescence.Category: bromides-buliding-blocks
Referemce:
Bromide – Wikipedia,
bromide – Wiktionary