Crystal and molecular structure of tetramethylbis[.mu.-(phenylethynyl)]-digallium

Abstract

Our initial observation that the vinyl group stabilized the electron-deficient bridged dimeric molecule Ga2(CH=CH2)6 lead us to postulate that the stabilization of this dimer resulted from metal-T-electron interactions.1 This stimulated our group, and others, to explore the structures of a variety of compounds including Al2[mirt,y-(/z-CH=CHC(CH3)3)]2(¡-Bu)4,2 Al2(c-Pr)6, Al2(M-C=CPh)2Ph4,4 Al2(,u-C= (1)

Alkyl Abstraction from a Trialkylyttrium Complex [YR3(thf)2] (R = CH2SiMe3) Using a Group‐13 Element Lewis Acid ER3 (E = B, Al, Ga, In) – Structural Characterisation of the Ion Pair [YR2(thf)4]+[GaR4]– and of ER3 (E = B, Al, Ga)

“…[GaEt 3 ] exhibits short intermolecular contacts in the solid-state structure, and [GaMe 3 ] shows a tetrameric arrangement of the molecules in the lattice, the interactions in both compounds being however very weak. [28] Dimeric gallium compounds require electron-donating bridging ligands, such as [{GaMe 2 (µ-CϵCMe)} 2 ], [29] [{Ga(CH=CH 2 ) 3 } 2 ], [30] [{GaMe 2 (µ-CϵCPh)} 2 ], [31] [{Ga(CH 2 Ph) 2 (Figure 7). Thus, the three C-Al-C angles of the alkyl groups composing the "base" of the tetrahedron display very close values [106.43(6)°, 107.32(6)°and 107.58 (6) -(1a) [3] displays a geometry much closer to a regular tetrahedral arrangement.…”

Bis(triphenylphosphin)iminium-Tetrakis(pentafluorphenyl)gallat

“…Die Gallium-Kohlenstoff-Abst~inde variieren geringftigig [1,984(8) (Karipides & Foerst, 1978), Tetrakis(pentafluorphenyl)germanium und Tetrakis(pentafluorphenyl)zinn (Karipides, Forman, Thomas & Reed, 1974) sind wie das Tetrakis(pentafluorphenyl)borat-Anion tetraedrisch aufgebaut. In den sechs bisher strukturell charakterisierten Verbindungen mit ausschliel31icher Verkntipfung des Galliums mit vier C-Atomen Tetramethyl-bis(/.t2-phenylethynyl)digallium (Tecle, Ilsley & Oliver, 1981) (Schmidbaur, Gasser, Krtiger & Sekutowski, 1977) (Lee, Pennington, Laske & Robinson, 1990), Bis(r/5-cyclopentadienyl)-(#2-methyl)dimethyl(#2-o3-cyclohexen-1,1,2-triyl)gallium-zirconium (Erker, Albrecht, Krtiger & Werner, 1992) und Bis(r/5-cyclopentadienyl)-(#2-methyl)-dimethyl-(/.t 2-o -3-benzol-1,1,2-triyl)-gallium-zirconium (Erker et al, 1992) ist das Gallium ausnahmslos Teil eines Ringsystems. Diese Verbindungen sind deshalb mit der hier vorgestellten Struktur nicht vergleichbar.…”

Ligand redistribution reactions of Me2Ga(C5H5) and MeGa(C5H5)2

“…The ligand redistribution reaction between Ga(C 5 H 5 ) 3 and GaMe 3 was investigated further by combining the reagents in a 1:1 ratio in THF, C6 H 6 and CC 4 and by studying the 1H NMR spectra of the resulting solutions. All data are consistent with the occurrence of ligand redistribution reactions …”