Cyclogallanes and Metalloaromaticity. Synthesis and Molecular Structure of Dipotassium Tris((2,6-dimesitylphenyl)cyclogallene), K2[(Mes2C6H3)Ga]3 (Mes = 2,4,6-Me3C6H2): A Structural and Theoretical Examination - Research portal of Justus Liebig University Giessen:

Journal article

Cyclogallanes and Metalloaromaticity. Synthesis and Molecular Structure of Dipotassium Tris((2,6-dimesitylphenyl)cyclogallene), K2[(Mes2C6H3)Ga]3 (Mes = 2,4,6-Me3C6H2): A Structural and Theoretical Examination

Authors list: Li, XW; Xie, Y; Schreiner, PR; Gripper, KD; Crittendon, RC; Campana, CF; Schaefer, HF; Robinson, GH

Publication year: 1996

Pages: 3798-3803

Journal: Organometallics

Volume number: 15

Issue number: 18

DOI Link: https://doi.org/10.1021/om9605084

Publisher: American Chemical Society

Abstract:

The cyclogallane dipotassium tris((2,6-dimesitylphenyl)cyclogallene), K₂[(Mes₂C₆H₃)Ga]₃ (Mes = 2,4,6-Me₃C₆H₂), has been prepared by either of two distinct synthetic routes. Disproportionation of gallium(II) chloride, Ga₂Cl₄, in the presence of (2,6-dimesitylphenyl)lithium, (Mes₂C₆H₃)Li, followed by potassium metal reduction in Et₂O affords the title compound as large ruby red crystals. Alternatively, K₂[(Mes₂C₆H₃)Ga]₃ may readily be approached by direct alkali metal reduction of (Mes₂C₆H₃)GaCl₂. The title compound was characterized by ¹H and ¹³C NMR, elemental analyses, IR spectroscopy, and single-crystal X-ray diffraction. The cyclogallane resides about the planar Ga₃ triangle constituted by extremely short Ga−Ga bonds: 2.4260(5), 2.4317(5), and 2.4187(5) Å. Theoretical examination of the Ga₃²^- anionic core in [GaH]₃²^-, Na₂[GaH]₃, and K₂[GaH]₃suggests a well-defined π-molecular orbital. Both experimental and theoretical results strongly support the cyclogallene dianion, [(Mes₂C₆H₃)Ga]₃²^-, as a well-defined metalloaromatic systema metallic ring system exhibiting aromatic behavior.

Authors/Editors

- Uni.-Prof. Dr. Peter Richard Schreiner, PhD

Citation Styles

Harvard Citation style: Li, X., Xie, Y., Schreiner, P., Gripper, K., Crittendon, R., Campana, C., et al. (1996) Cyclogallanes and Metalloaromaticity. Synthesis and Molecular Structure of Dipotassium Tris((2,6-dimesitylphenyl)cyclogallene), K2[(Mes2C6H3)Ga]3 (Mes = 2,4,6-Me3C6H2): A Structural and Theoretical Examination, Organometallics, 15(18), pp. 3798-3803. https://doi.org/10.1021/om9605084

APA Citation style: Li, X., Xie, Y., Schreiner, P., Gripper, K., Crittendon, R., Campana, C., Schaefer, H., & Robinson, G. (1996). Cyclogallanes and Metalloaromaticity. Synthesis and Molecular Structure of Dipotassium Tris((2,6-dimesitylphenyl)cyclogallene), K2[(Mes2C6H3)Ga]3 (Mes = 2,4,6-Me3C6H2): A Structural and Theoretical Examination. Organometallics. 15(18), 3798-3803. https://doi.org/10.1021/om9605084