Synthesis, Characterization, and Properties of Three-Dimensional Analogues of 9-Borafluorenes

Zhang，Chonghe1; Wang，Junyi1,2; Lin，Zhenyang2; Ye，Qing3,4

2022

10.1021/acs.inorgchem.2c03111

INORGANIC CHEMISTRY   Impact Factor & Quartile

0020-1669

1520-510X

Three-dimensional (3D) analogues of 9-borafluorenes, (C2B10H10)2BR (R = Cl (1), Br (2), H (3, merely as ether or silane adduct), phenyl (4), mesityl (5)), were synthesized and fully characterized. Gutmann-Beckett and computational fluoride/hydride ion affinity (FIA/HIA) studies confirmed the Lewis superacidity of 1-4, with the Lewis acidity of 1-3 being higher than that of the corresponding 3D analogues of 9,10-diboraanthracenes (DBA). The phenyl group and the C4B borole unit are nearly coplanar in the solid state, while the rotation of the mesityl group of 5 is hindered, forcing 5 to adopt a large C4B/Mes dihedral angle, which leads to distinct properties: air-stable and bluish-violet fluorescence arising from the intramolecular charge-transfer (ICT) transition. The 29Si NMR spectra indicated a high silylium cation character of 3·Et3SiH. The reaction of 4 with Ph3CBr yielded (Ph3C)+[(C2B10H10)2B(Ph)Br]- (6). The 4/PPh3 Lewis pair was capable of splitting dihydrogen and Si-H bond of triethylsilane.

SCI

English

NI Journal Papers

First

NSFC[22071095] ; Stable Support Plan Program of Shenzhen Natural Science Fund[20200925152822004]

Chemistry

Chemistry, Inorganic & Nuclear

WOS:000898817000001

AMER CHEMICAL SOC

CHEMISTRY

2-s2.0-85141736872

Scopus

1.Department of Chemistry,Southern University of Science and Technology,Shenzhen,518055,China
2.Department of Chemistry,The Hong Kong University of Science and Technology,Kowloon,Clear Water Bay,999077,Hong Kong
3.Institute for Inorganic Chemistry,Julius-Maximilians-Universität Würzburg,Würzburg,Am Hubland,97074,Germany
4.Institute for Sustainable Chemistry & Catalysis with Boron,Julius-Maximilians-Universität Würzburg,Würzburg,Am Hubland,97074,Germany

Zhang，Chonghe,Wang，Junyi,Lin，Zhenyang,et al. Synthesis, Characterization, and Properties of Three-Dimensional Analogues of 9-Borafluorenes[J]. INORGANIC CHEMISTRY,2022,61(45).

Zhang，Chonghe,Wang，Junyi,Lin，Zhenyang,&Ye，Qing.(2022).Synthesis, Characterization, and Properties of Three-Dimensional Analogues of 9-Borafluorenes.INORGANIC CHEMISTRY,61(45).

Zhang，Chonghe,et al."Synthesis, Characterization, and Properties of Three-Dimensional Analogues of 9-Borafluorenes".INORGANIC CHEMISTRY 61.45(2022).