A simple high-yield synthesis of gallium(I) tetrachlorogallate(III) and the reaction of digallium tetrachloride tetrahydrofuran solvate with 1,2-diols

Eva S. Schmidt, Annette Schier, Norbert W. Mitzel, Hubert Schmidbaur

Research output: Contribution to journalArticlepeer-review

17 Scopus citations

Abstract

Gallium(I) tetrachlorogallate(III) Ga[GaCl4] was prepared in quantitative yield by thermal decomposition of dichlorogallane [HGaCl2]2, which is readily available from Et3SiH and [GaCl3]2. The reaction of catechol with solutions of this gallium(I) tetrachlorogallate(III) in tetrahydrofuran leads to the evolution of hydrogen gas and affords a dinuclear gallium(III) complex with penta-coordinate metal atoms chelated and bridged by mono-deprotonated catechol ligands. In the crystalline phase tetrahydrofuran molecules are hydrogen-bonded to the hydroxy groups: [Ga(1,2-OC6H4OH)Cl2(C4H 8O)]2. The reaction with pinacol also gives hydrogen and the analogous product [Ga(OCMe2CMe2OH)Cl2(C4H 8O)]2. The structures of the two compounds have been determined by X-ray diffraction. A mechanism of the new reaction has been proposed which involves oxidative addition of the diol to the solvate (THF)Cl2Ga-GaCl2(THF) present in the tetrahydrofuran solution to give a gallium hydride intermediate.

Original languageEnglish
Pages (from-to)337-341
Number of pages5
JournalZeitschrift fur Naturforschung - Section B Journal of Chemical Sciences
Volume56
Issue number4-5
DOIs
StatePublished - 2001
Externally publishedYes

Keywords

  • Gallium diolates
  • Gallium halides
  • Oxidative addition

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