Indium, Trimethyl

Studies of the pyrolysis of these three alkyls may conveniently be discussed in a combined section. The decompositions were carried out in a conventional toluene carrier flow system using contact times of 1-2 sec120,122,123. The conditions used satisfy both plug flow and thermal equilibrium requirements68,69. Toluene to alkyl ratios greater than 50 in the trimethyl gallium system and greater than 200 in the trimethyl indium and thallium studies were required to obtain first-order dependence in terms of the alkyl concentration. Under these conditions methane and ethane are produced by the reactions... 

Fig. 5. The Arrhenius plot of kl/k2i. e, dimethyl zinc O, trimethyl gallium , trimethyl indium. % figures are in terms of the theoretical yield of methyl radicals that would be obtained if all methyl-metal bonds were broken. All points are corrected to 13 torr pressure (toluene+0.3-2.5 % alkyl).

An ethereal solution of methyllithum (84 mL of 1.0 M solution, 84 mmol as close to a 3 1 ratio as possible) is added dropwise, and the solution is heated under reflux, cooled, and filtered as described for the trimethyl indium preparation. Toluene (70 mL), dppe (5.53 g, 13.9 mmol), and a stirrer bar are... 

The list of precursors for indium contains indium trichloride (InCfi) [96-109], indium trifluoride (InFj) [110], indium acetate (In(ac)2(OH)) [111], indium acetylace-tonate (In(acac)j) [112-115], tris-2,2,6,6-tetramethyl-3,5-heptanedionate indium (In(thd)3) [116, 117], trimethyl indium (ln(CH3)3) [116, 118], trimethyl indium diethyletherate ((CH3)3ln(0(CH2CH3)2)) [119], indium 2-ethylhexanoate... 

Lithium alkylamides react with dimethyltin dichloride to give the cyclotristannazane, which is methylated by trimethyl-aluminum, -gallium, or -indium, giving the metal stannylamides, which are coordinatively dimerized (Equation (167)).503... 

The reaction of toluene solutions of indium trichloride and tris(trimethylsilyl)arsine resulted in the formation of a very fine dark-brown powder subsequently annealed up to 400°C to drive to completion the elimination of trimethyl-silyl-chloride. Nanocrystalline InAs was obtained. Similar reactions with InBr3 and Inl3 and P compounds have been discussed. Previously a similar reaction was described by Uchida et al. (1993) (reaction of indium acetylacetonate with tris(trimethylsilyl)arsine in refluxing triglyme). Subsequently the reaction with InCl3 was used by Guzelian et al. (1996) in the preparation of nano-crystal quantum dots. They compared different preparation methods and techniques useful to isolate specific size distributions. 

Dimethylpropynylindium (XLVIII) can be prepared by the reaction of dimethylindium chloride or bromide with sodium propynide as a colorless, crystalline substance 148). Whereas indium trimethyl is monomeric in benzene, the alkynyl compound is dimeric, but only sparingly soluble in this and other aprotic noncoordinating solvents. Improved solubility has been observed in diethyl ether due to the formation of a weak adduct 148). According to crystallographic data 148), compound XLVIII can be regarded as a coordination polymer in the solid state, as indicated in Fig. 10. The axial positions on the trigonal bipyramidal coordination polyhedron of each... 

In 2004 an indium-NHC complex was reported which was prepared from an air stable imidazolium salt precursor.29 Reaction of one equivalent of imidazolium salt with InMe3 affords (NHC)InMe2Cl 18 (Scheme 12). The indium-NHC bond distance of 2.267(2) A is shorter than that of InH3(NHC), though longer than the bis-NHC InBr3(NHC)2. Mono-triflate (19) and bis-triflate (20) complexes can also be prepared by treatment of 18 with trimethyl silyl triflate and treatment of 19 with triflic acid respectively. 

In analogy to Be(ii) and Al(iii), also gallium(iii) and indium(iii) form stable complexes with organophosphorus ligands. Illustrative examples are the hexakis(trimethyl phosphate)-gallium(iil) and -indium(iii) complexes which have been recently examined. (146)... 

Inis, Indium iodide, 24 87 InSi3Ci2H]], Indium(III), tris[(trimethyl-silyl)methyl]-, 24 89 IrCIF6N408S2C6H,8, Iridium(III), chlo-robis( 1,2-ethanediamine)(trifluoro-methanesuIfonato-O)-, trans-, trifluoro-methanesulfonate, 24 289 IrQOPCi7H22, Iridium(I), carbonylchlo-robis(dimethylphenylphosphine)-, trans-, 21 97... 

The dilFerence in these reorganization energies cannot wholly account for the variation of /-- 12kcal in the heats of addition reactions. This variation must be, in part, due to a weaker o-bond between phosphorus and boron atoms than between nitrogen and boron atoms. This can be shown from the heats of addition reactions between gallium trimethyl and either trimethylamine or tri-methyl pho sphine. These heats are shown in Table 7, together with similar data for indium trimethyl. 

Heats of addition, reactions. Boron, gaUium and indium trimethyl... 

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