Dimethylamineâgallane is relatively slow to decompose in a closed system and vaporises at low temperature primarily as Me2(H)N·GaH3 molecules which can be trapped in a solid Ar matrix and characterised by their IR spectrum. Under the conditions needed to secure a useful gas electron diffraction (GED) pattern, however, the vapour was found to consist of dimeric dimethylamidogallane molecules, [Me2NGaH2]2, formed from the secondary amine adduct by elimination of H2, and the most reliable structure for which has been determined. Salient structural parameters (rhl structure) were found to be: r(GaâN) 202.6(2), r(GaâH) 155.6(8), r(NâC) 148.0(3), r(CâH) 111.2(6) pm; GaâNâGa 90.7(1), CâNâC 109.3(5), NâCâH 109.9(10) and HâGaâH 119.4(42)°.
二甲胺基
镓烷在封闭系统中的分解速度相对较慢,在低温下主要以 Me2(H)NÂ-
GaH3 分子的形式蒸发,这些分子可以被困在固体 Ar 基质中,并通过其红外光谱进行表征。然而,在获得有用的气体电子衍射(GED)模式所需的条件下,我们发现蒸气由二聚体二甲基
氨基
镓烷分子 [Me2NGaH2]2 组成,它是由仲胺加合物通过消除 H2 形成的,其最可靠的结构已经确定。主要结构参数(rhl 结构)为:r(GaâN) 202.6(2),r(GaâH) 155.6(8),r(NâC) 148.0(3),r(CâH) 111.2(6) pm;GaâNâGa 90.7(1),CâNâC 109.3(5),NâCâH 109.9(10),HâGaâH 119.4(42)°。