The synthesis and deep purification of GaEt3. Reversible complexation of adducts MAlk3 (M = Al, Ga, In; Alk = Me, Et) with phenylphosphines

Coordination chemistry of the main group elements with phosphine, arsine and stibine ligands

“…The syntheses are straightforward involving combining the GaR 3 with ER 3 either in a hydrocarbon or without a solvent [141,194,196,198,199,201]. Triarylgallium examples are fewer but generally similar [198,203].…”

“…Di-and poly-phosphine adducts are also known [141,146,202] and all contain only a single phosphorus donor bonded to each gallium centre. The adducts with involatile phosphines have been used to store the GaR 3 , and since the GaR 3 is liberated on heating in vacuo, this also affords a means of purifying the GaR 3 for electronic materials applications [141,146]. A considerable number of compounds have been characterised by X-ray diffraction (Table 7), all contain four-coordinate distorted tetrahedral gallium.…”

“…Pnictogen ligand adducts of trialkylindiums are generally similar to their lighter analogues, although less extensively studied [141,146,149,190,196,[237][238][239][240][241]. All are distorted tetrahedral and even with tri-and tetra-dentate phosphines only one phosphine donor group coordinates to each indium centre [146].…”

“…Industry has focused on dual source routes for MOCVD utilising the MR 3 (M = Al, Ga or In) and PH 3 or AsH 3 , and less frequently primary or secondary phosphines. This work requires ultrapure MR 3 , and purification can be achieved by formation of adducts with phosphines or amines, from which the MR 3 is subsequently released by heating [141,146]. Single source precursors are of interest in specific areas including deposition of thin films, deposition into patterned substrates or formation of nanoparticles.…”

The Al(ORF)3/H2O/Phosphane [RF = C(CF3)3] System – Protonation of Phosphanes and Absolute Brønsted Acidity

“…The Al-P distances range from 244.1(1) in 1 to 244.7(2) pm in 2 and are significantly shorter than those in other R 3 Al-phosphane adducts owing to the strong electronwithdrawing effect of the fluorinated alkoxy ligands at the aluminum atom [R = Me 253.29(6) pm, R = Et 254.13(4) pm, [46] R = PhSe, 2*Me 251.7(1) pm]. [47] The shortening of the Al-P bond length by 0.6 pm in 1 compared to that in 2 can be explained by the additional inductive effect of the methyl group and the reduced Tolman cone angle (136 vs. 145°).…”