Quantum chain amplification in nanocrystalline Dewar benzenes by intramolecular sensitization
作者:Edris Rivera、Indrajit Paul、Javier Fajardo、Miguel A. Garcia-Garibay
DOI:10.1039/d3sc01074k
日期:——
mechanism. The triplet-sensitized isomerization of Dewar benzene is known to undergo quantum chain reactions characterized by an adiabatic valence-bond isomerization to the excited state of Hückel benzene, which is able to transfer its triplet energy to a new ground state Dewar benzene that reacts to continue the chain. Given that diffusion-mediated energy transfer is the chain-limiting event in solution
量子链反应的特点是每个吸收的光子形成几个光产物 ( Φ QC> 1) 并构成了一种很有前途的信号放大机制。已知杜瓦苯的三重态敏化异构化会发生量子链反应,其特征是绝热价键异构化为 Hückel 苯的激发态,能够将其三重态能量转移到新的基态杜瓦苯,该反应继续进行连锁,链条。鉴于扩散介导的能量转移是溶液中的链限制事件,我们在此证明,通过假定的激子离域机制利用能量转移,晶体中的反应效率显着提高。使用具有共价连接的高能三线态敏化剂的杜瓦苯,我们通过放大ca的量子产率证明了固态的效率。ΦQC _≈ 76 在乙腈溶液中至ca。Φ QC ≈ 100–120 在通过再沉淀法制备的亚微米尺寸样品中,高达ca。Φ QC ≈ 300,微晶粉末悬浮在水中。