biostudies-literatureUnknown11(51)Wang WAs an ending acceptor unit (A) within acceptor-donor-acceptor (A-D-A)-type small molecule acceptors (SMAs), monobrominated 1,1-dicyanomethylene-3-indanone (IC-Br) plays a critical role on developing high-performance SMAs and polymer acceptors from polymerizing SMAs. IC-Br is usually a mixture (IC-Br-m) consisting of positional isomeric IC-Br-γ and IC-Br-δ (bromine substituted on the γ and δ positions, respectively). The positional isomeric effect of these monobrominated ending groups has been witnessed to take an important role on regulating the photovoltaic performance. Fully investigating this isomeric effect of monobromination would be of great value for SMAs and even polymer acceptors. In this study, benefitting from the separation of IC-Br-γ and IC-Br-δ from IC-Br-m with high yields, RSC advances31992-31999https://www.ebi.ac.uk/biostudies/studies/S-EPMC9042045biostudies-literaturePositional isomeric effect of monobrominated ending groups within small molecule acceptors on photovoltaic performance.PMC9042045Li GLi YZhan CLu XWang WXiao SfalsePositional isomeric effect of monobrominated ending groups within small molecule acceptors on photovoltaic performance.As an ending acceptor unit (A) within acceptor-donor-acceptor (A-D-A)-type small molecule acceptors (SMAs), monobrominated 1,1-dicyanomethylene-3-indanone (IC-Br) plays a critical role on developing high-performance SMAs and polymer acceptors from polymerizing SMAs. IC-Br is usually a mixture (IC-Br-m) consisting of positional isomeric IC-Br-γ and IC-Br-δ (bromine substituted on the γ and δ positions, respectively). The positional isomeric effect of these monobrominated ending groups has been witnessed to take an important role on regulating the photovoltaic performance. Fully investigating this isomeric effect of monobromination would be of great value for SMAs and even polymer acceptors. In this study, benefitting from the separation of IC-Br-γ and IC-Br-δ from IC-Br-m with high yields, 2021-01-01T00:00:00Z2021 Sep2025-04-05T11:08:12.817Z2025-04-05T11:08:12.817ZS-EPMC90420453549553310.1039/d1ra05426k