Zwei Galliumfluorid-Ammoniakate: Ga(NH3)F3 und Ga(NH3)2F3

✍ Scribed by Meike Roos; Gerd Meyer

• Publisher: John Wiley and Sons
• Year: 1999
• Tongue: German
• Weight: 174 KB
• Volume: 625
• Category: Article
• ISSN: 0372-7874
• DOI: 10.1002/(sici)1521-3749(199907)625:7<1129::aid-zaac1129>3.0.co;2-#

✦ Synopsis

Inhaltsu È bersicht. Die Ammoniakate des Galliumtrifluorids Ga(NH 3 )F 3 und Ga(NH 3 ) 2 F 3 entstehen bei der Oxidation von Gallium mit NH 4 HF 2 (Ga : NH 4 HF 2 = 1 : 1,5) bzw. NH 4 F (Ga : NH 4 F = 1 : 3,5) bei 450 °C bzw. 400 °C neben anderen Produkten als farblose Einkristalle. Ga(NH 3 )F 3 kristallisiert in der azentrischen Raumgruppe Abm2 (a = b = 544,6(2) pm, c = 986,6(4) pm) unter Ausbildung zweidimensionaler Schichten aus [Ga(NH 3 )F 5 ]-Oktaedern. Durch den Einbau eines weiteren NH 3 -Moleku È ls werden in Ga( NH 3 ) 2 F 3 (orthorhombisch,Immm,a = 700,0(3) pm,b = 724,7(2) pm, c = 393,1(1) pm) die so entstehenden [Ga(NH 3 ) 2 F 4 ]-Einheiten zu eindimensionalen Stra È ngen verknu È pft, die parallel [001] verlaufen und entlang [010] ¹auf Lu È ckeª gestapelt sind. IR-Untersuchungen belegen fu È r Ga(NH 3 )F 3 N±H ´´´F-Wasserstoffbru È ckenbindungen, fu È r Ga(NH 3 ) 2 F 3 sind keine eindeutigen Aussagen mo È glich.

Two Gallium Fluoride Ammine Complexes: Ga(NH 3 )F 3 and Ga(NH 3 ) 2 F 3 Abstract. Two gallium trifluoride ammines, Ga(NH 3 )F 3 and Ga(NH 3 ) 2 F 3 , are obtained as single crystals through oxidation of gallium metal with NH 4 HF 2 (Ga : NH 4 HF 2 = 1 : 1.5) and NH 4 F (Ga : NH 4 F = 1 : 3.5), respectively, at 450 °C and 400 °C. Ga(NH 3 )F 3 crystallizes with the non-centrosymmetric space group Abm2 (a = b = 544.6(2) pm, c = 986.6(4) pm) forming two-dimensional layers of [Ga(NH 3 )F 5 ] octahedra. The addition of another NH 3 molecule in Ga(NH 3 ) 2 F 3 (orthorhombic, Immm, a = 700.0(3) pm, b = 724.7(2) pm, c = 393.1(1) pm) leads to one-dimensional rods of [Ga(NH 3 ) 2 F 4 ] octahedra running parallel [001] which are stacked in the [010] direction. Infrared spectra suggest hydrogen bonding (N±H ´´´F) in Ga(NH 3 )F 3 , for Ga(NH 3 ) 2 F 3 an unequivocal statement is not possible.