Chakraborty Subhayan, Nguyen Han P Q, Usuba Junichi, Choi Ji Yong, Sun Zhenhuan, Raju Cijil, Sigelmann Gustavo, Qiu Qianfeng, Cho Sungwon, Tenney Stephanie M, Shulenberger Katherine E, Schmidt-Rohr Klaus, Park Jihye, Han Grace G D
Department of Chemistry, Brandeis University, 415 South Street, Waltham, MA 02453, USA.
Department of Chemistry, University of Colorado Boulder, 215 UCB, Boulder, CO 80309, USA.
Chem. 2024 Nov 14;10(11):3309-3322. doi: 10.1016/j.chempr.2024.06.033. Epub 2024 Jul 22.
We introduce donor-acceptor substituted anthracenes as effective molecular solar thermal energy storage compounds that operate exclusively in the solid state. The donor-acceptor anthracenes undergo visible light-induced [4+4] cycloaddition reaction, producing metastable cycloadducts, dianthracenes with quaternary carbons, and storing photon energy. The triggered cycloreversion of dianthracenes to anthracenes discharges the stored energy as heat in the order of 100 kJ/mol (200 J/g). The series of compounds displays remarkable self-heating, or cascading heat release, upon the initial triggering. Such self-activated energy release is enabled by the large energy storage in dianthracenes, low activation energy for their thermal reversion, and effective heat transfer to unreacted molecules in the solid state. This process mirroring the self-ignition of fossil fuels opens up opportunities to use dianthracenes as effective and renewable solid-state fuels that can release energy rapidly and completely upon initial activation.
我们引入供体-受体取代的蒽作为仅在固态下起作用的有效分子太阳能热能存储化合物。供体-受体蒽会发生可见光诱导的[4+4]环加成反应，生成亚稳态环加成物、具有季碳的二蒽，并储存光子能量。二蒽触发的环化逆转将储存的能量以约100 kJ/mol（200 J/g）的热量形式释放出来。该系列化合物在初始触发时表现出显著的自热或级联热释放。这种自激活能量释放是由二蒽中的大量能量存储、其热逆转的低活化能以及向固态中未反应分子的有效热传递实现的。这一类似于化石燃料自燃的过程为将二蒽用作有效且可再生的固态燃料开辟了机会，这些燃料在初始激活时能够快速且完全地释放能量。
