Three-Coordinate Boron(III) and Diboron(II) Dications

Daniel Franz, Tibor Szilvási, Alexander Pöthig, Franziska Deiser, Shigeyoshi Inoue

Research output: Contribution to journalArticlepeer-review

28 Scopus citations


The enhanced electron-donor properties of the bulky bisimino ligand 1,2-(LMesN)2-C2H4 (1; LMes=1,3-bis(mesityl)-imidazolin-2-ylidene), mesityl=2,4,6-trimethylphenyl) were exploited for the stabilization of elusive electron-deficient and low-coordinate boron dication species. The reaction of 1 with PhBBr2 or (B(Cl)NMe2)2 afforded a dicationic mononuclear boron(III) complex or a dicationic dinuclear boron(II) complex, respectively (42+, 62+). The bonding situations of 42+ and 62+ were examined by means of single crystal X-ray diffraction analysis, as well as theoretical methods. Significant allocation of positive charge density into the ligand system was diagnosed for both dications. However, the metalloid-centered Lewis acidity of the dications was confirmed via hydride transfer reactions.

Original languageEnglish
Pages (from-to)4283-4288
Number of pages6
JournalChemistry - A European Journal
Issue number17
StatePublished - 20 Mar 2018


  • N-heterocyclic imines
  • boron
  • cations
  • diboron
  • subvalent compounds


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