Isolation and Crystal Structure of (Hexamethylbenzene)gallium(I) Tetrachlorogallate(III), a Mono(arene) Complex of Gallium(I)

Ulf Thewalt, Theodore Zafiropoulos, Hubert Schmidbaur

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Ga2Cl4 reacts with hexamethylbenzene in benzene to give (hexamethylbenzene)gallium(I)-tetrachlorogallate(III), (CH3)6C6Ga' GaCl4, in high yield. The complex crystallizes in the rhombohedral space group R3m with four formula units per cell. Cell constants are a = 12.449(3) A and a = 91.01(2)°. In the structure tetrameric clusters can be identified containing two crystallographically independent formula units, one having 3 m and the other three having m symmetry. In both types of (arene)Ga” cations the Ga atoms are symmetrically positioned over the arene ring, 2.43(3) and 2.51(3) A. respectively, away from the ring plane. Four (arene)Ga+ cations and four GaCl4 anions are aggregated in such a way that the Ga1 atoms are surrounded by six or seven chlorine atoms, respectively, at distances in the range 3.16(1) to 3.67(1) A. The four hexamethylbenzene molecules form an efficient cover around the inorganic [Ga GaCl4]4 framework. Between the tetrameric clusters there are no contacts of the Ga1…Cl Type.

Original languageEnglish
Pages (from-to)1642-1646
Number of pages5
JournalZeitschrift fur Naturforschung - Section B Journal of Chemical Sciences
Issue number12
StatePublished - 1 Dec 1984
Externally publishedYes


  • Arene Complex
  • Crystal Structure
  • Gallium (I) Complex
  • Gallium (I) Tetrachlorogallate(III)
  • Hexamethylbenzene Complex


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