《Insights into constitutional isomeric effects on donor-acceptor intermolecular arrangements in non-fullerene organic solar cells》 was published in Journal of Materials Chemistry A: Materials for Energy and Sustainability in 2019. These research results belong to Lee, Jungho; Go, Eun Min; Dharmapurikar, Satej; Xu, Jianqiu; Lee, Sang Myeon; Jeong, Mingyu; Lee, Kyu Cheol; Oh, Jiyeon; Cho, Yongjoon; Zhang, Chunfeng; Xiao, Min; Kwak, Sang Kyu; Yang, Changduk. Formula: C7H5Br2F The article mentions the following:
Donor-acceptor intermol. interactions and/or arrangements are key factors determining the performance of organic solar cells (OSCs). Herein, two ITIC-based isomeric acceptors (o-F-ITIC and m-F-ITIC) with fluorine atoms at ortho and meta positions within the side chains were developed. The developed acceptors showed different interactions and/or arrangements with the donor counterpart (PBDB-T), which caused a significant variation in the power conversion efficiency (PCE) of OSCs. The PCE of the PBDB-T:o-F-ITIC device was 11.11% vs. 8.90% of the PBDB-T:m-F-ITIC device. A detailed theor. anal. of the intermol. complexes formed between F-ITICs and PBDB-T allows a determination of how the two isomeric acceptors interact differently with PBDB-T. Relative to PBDB-T:m-F-ITIC with a preferential DCI-BDD complex, PBDB-T:o-F-ITIC showed a closer donor-acceptor interaction, with a tightly packed parallel-like DCI-BDT complex, resulting in larger interfacial areas. These behavioral characteristics explain in detail the exptl. results obtained from the comparison of the two blend systems relating to elec. and morphol. properties. Moreover, transient absorption spectroscopy of PBDB-T:o-F-ITIC revealed superior hole/electron transfer and separation processes, providing further evidence of the presence of beneficial intermol. complexes. This study facilitates the understanding of the role of constitutional isomerism both in intermol. interactions and in promoting the development of high-performance OSCs. The experimental process involved the reaction of 4-Bromo-1-(bromomethyl)-2-fluorobenzene(cas: 76283-09-5Formula: C7H5Br2F)
4-Bromo-1-(bromomethyl)-2-fluorobenzene(cas: 76283-09-5) belongs to organobromine compounds.The reactivity of organobromine compounds resembles but is intermediate between the reactivity of organochlorine and organoiodine compounds. Formula: C7H5Br2F Dehydrobromination, Grignard reactions, reductive coupling, Wittig reaction, and several nucleophilic substitution reactions are some of the principal reactions which involve organic bromides.
Referemce:
Bromide – Wikipedia,
bromide – Wiktionary