Luminescent organoboron ladder compounds via directed electrophilic aromatic C-H borylation

Mayyadah Yusuf, Kanglei Liu, Fang Guo, Roger A. Lalancette, Frieder Jäkle

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56 Scopus citations


Luminescent B-N containing conjugated ladder compounds are prepared by directed electrophilic aromatic substitution. Negishi cross-coupling reaction of 2,7-dibromo-9,9-dihexylfluorene with 6-methylpyridin-2-yl(pivaloyloxy)zinc furnishes the dipyridylfluorene precursor (1) in 44% yield. Compound 1 is then subjected to electrophilic borylation with BBr3 in the presence of iPr2NEt as a bulky base to give the tetra-coordinate ladder-type organoboron species 2-Br. Arylation of 2-Br is accomplished by addition of Ph2Zn or C6F5Cu in toluene furnishing the targeted bis(pentafluorophenyl)borane and diphenylborane species 2-Ar (Ar = Ph, C6F5) in 53 and 44% yield respectively. The products show a strong blue emission and undergo multi-step reversible reduction and oxidation processes. The effect of fluorination of the pendant aryl groups on the electronic structure is further examined by DFT methods.

Original languageEnglish (US)
Pages (from-to)4580-4587
Number of pages8
JournalDalton Transactions
Issue number11
StatePublished - 2016

All Science Journal Classification (ASJC) codes

  • Inorganic Chemistry


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