Indium alkyls

Bis(pyrazolyl)hydroborato indium alkyl derivatives with both one and two [Bp] ligands, e.g., [Bp]InMe(Cl) and [Bp]2InMe, have been prepared by the reactions of MeInCl2 with one and two equivalents of K[Bp], respectively (Scheme 16) (113). Likewise, the dimethyl derivative [Bp]InMe2 is prepared by the reaction of Me2InCl with K[Bp] [Eq. (22)]. 

The conventional method of CVD growth of In-V thin films is to use indium alkyl precursors (Table 8), preferably Me3In. However, early problems in the growth of InP and InGaAs were... 

Trimethylindium is a glassy-white crystalline solid due to its unique tet-rameric nature. In the vapor phase it is monomeric, and has the highest vapor pressure of all the indium alkyls mp 88°C, bp 135°C. It ignites spontaneously in air (pyrophoric) and decomposes violently in water. It can be stored... 

Pyrazine reacts with triethylborane and other such gallium or indium alkyls in the presence of sodium to afford persistent radical complexes 260 also somewhat similar aluminum and silicon complexes.457... 

A recent study on the stability of various indium alkyl derivatives has been performed using differential scanning calorimetry (DSC), which provides a comprehensive thermal fingerprint of the compounds. In addition, when this method of thermal analyses is used in conjunction with thermogravimetric analysis coupled to FTIR and/or GCMS evolved gas analysis, it can provide a complete mechanism for the decomposition pathway of prospective compounds. ... 

The products of the reactions of silanetriols with gallium [41] and indium alkyls [42] are very similar to those obtained from aluminum alkyls described above. The interest in Ga containing siloxanes stems from the known catalytic activity of Ga-doped zeolites in the dehydrogenation reactions of alkanes. The reactions of silanetriols 15 and 16 with GaMej or InMes in refluxing hexane/1,4-dioxane lead to the cubic Ga/In siloxanes [RSi03M-THF]4 (M = Ga 38, 39 In 40, 41), respectively. In the resulting products, the Ga and In centers are coordinated to a dioxane solvent molecule These compounds have a very similar structure to that of aluminosiloxanes 30-33 shown in Scheme 7. 

This method has the advantage over the use of ethereal solutions of magnesium and lithium alkyls in that the metal alkyls can be prepared ether-free. In certain cases, however, not all the alkyl groups of RSA1 are available. Thus in the preparation of gallium and indium alkyls the reaction proceeds according to the following equation (142) ... 

Whereas aluminium alkyls react with most hydroxy compounds (imless there are steric complications) with loss of all three alkyl groups, such reactions tend to stop after one or two alkyl groups have been eliminated from gallium and indium alkyls. Thallium trialkyls are hydrolysed only as far as R2TIOH, and to R2T1 cations in add solution (these are considered later). 

---