《Balancing Charge Transfer and Frenkel Exciton Coupling Leads to Excimer Formation in Molecular Dimers: Implications for Singlet Fission》 was published in Journal of Physical Chemistry A in 2020. These research results belong to Bae, Youn Jue; Shimizu, Daiki; Schultz, Jonathan D.; Kang, Gyeongwon; Zhou, Jiawang; Schatz, George C.; Osuka, Atsuhiro; Wasielewski, Michael R.. Formula: C6H4BrI The article mentions the following:
Photoexcitation of mol. chromophore aggregates can form excimer states that play a significant role in photophys. processes such as charge and energy transfer as well as singlet fission. An excimer state is commonly defined as a superposition of Frenkel exciton and charge transfer states. The dynamics were studied of excimer formation and decay in π-stacked 9,10-bis(phenylethynyl)anthracene (BPEA) covalent dimers appended to a xanthene spacer, where the electronic coupling between the 2 BPEA mols. is adjusted by changing their longitudinal mol. slip distances. Using exciton coupling calculations, the authors quantify the relative contributions of Frenkel excitons and charge transfer states and find that there is an upper and lower threshold of the charge transfer contribution for efficient excimer formation to occur. Knowing these thresholds can aid the design of mol. aggregates that optimize singlet fission. In addition to this study using 1-Bromo-4-iodobenzene, there are many other studies that have used 1-Bromo-4-iodobenzene(cas: 589-87-7Formula: C6H4BrI) was used in this study.
1-Bromo-4-iodobenzene(cas: 589-87-7) has been employed as reagent for in situ desilylation and coupling of silylated alkynes, as starting reagent in the total syntheses of ent-conduramine A and ent-7-deoxypancratistatin (alkaloids), as substrate in copper-free Sonogashira coupling in aqueous acetone in synthesis of β,β,dibromostyrenesFormula: C6H4BrI
Referemce:
Iodide – Wikipedia,
Iodide – an overview | ScienceDirect Topics – ScienceDirect.com