Digallane structures

Figure 16 Structural comparison of analogously substituted digallane and diindane.

Figure 21 Structures of digallane adducts illustrating the different coordination modes of carboxylic and triazenato ligands.

Fig. 12.3. The molecular structures of tetramethyldialane (CH3)4Al2(ix—H)2 and digallane H4Ga2( x-H)2.

A report on the synthesis, properties and structure of gallaborane was published in 1990 [47]. Since then, a number of articles appeared reporting calculations [7,28,36,48,49] and experimental studies [7]. Table 5 shows the results of our calculations, together with two of the most recent calculations found in the literature [7,36]. Our geometries are in good agreement with experiment [47], with a precision about the same as the calculations on diborane and digallane. Electron... 

Studies of how the intensities of bands vary as a function of concentration or pressure have been important in determining the identities of reaction products (e.g. Xc2 from XeF" and elemental xenon (Section 12.2.2)). Variations as a function of temperature have been used to estimate the enthalpy changes of various reactions, such as the dissociation of digallane (Ga2Hs) into two monogaUane molecules (GaHa) [17]. An alternative approach has been to trap vapors of equilibrium mixtures of molecules with different conformations or different structures held at different temperatures in cold matrices (Section 2.8.1). Data from IR spectra have then been used to determine equilibrium constants and associated thermodynamic properties for systems such as ds-FC(0)0F trani-FC(0)OF [18]. 

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