Silane ligand other ligands

Table 7.2. Bond Dissociation Enthalpies (kcal/mol) of H2, Alkanes, Silanes, and Other Ligands (L) from Various 16e Fragments Measured in Heptane Solution...

Thiols, Phosphines, Amines, and Silanes. With these ligands, ethanol addition clearly gives a precipitate that can be isolated and readily redispersed in toluene or any other non-polar solvent again. 

It appears that ligand exchange in pentacoordinate silicon species involves many pathways. Beside a possible intramolecular isomerization arising from Berry pseudorotation of a trigonal bipyramidal silane, several other processes may take place. The multiplicity of mechanisms comes from the possibility for pentacoordinate silanes to react by associative or dissociative pathways. Isomerization and exchange processes can involve a reduction of the coordination number to four or an expansion to six. 

The photodiemistiy and selective metallization of other ligand UTFs has also been investigated. The EDA silane, consistent with its weak absorption at 193 nm, has been reported to have a photodiemical dose (elimination of the N signal tty XPS anatysis) of 13-15 J/cm (25, 30). However, the PEDA sflane which has a large absorption at 195 nm due to the phenyl diromophore, eriiibits a dose for selective metallization of 300 mJ/on at 193 nm on a Si thermal oxide substrate. 

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