Silanol
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General
Silanols are compounds containing silicon atoms to which hydroxy substituents bond directly. They are considered to be heavier analogues of alcohols.
Silanols are named, when the hydroxy group is the principal one, by adding the suffix –ol to their mother name. If the hydroxy group is not the principal one, silanols are named by using the prefix hydroxy- according to the substitutive nomenclature. These rules are almost the same as those of alcohol, with the exception that silane is used as the mother hydride.
History
Silanols were first synthesized in 1871 by Albert Ladenburg. The first example was triethylsilanol. At that time, they were called silicols, a word that he coined.
Synthesis
Silanols are generally synthesized by hydrolysis of halosilane, alkoxysilane, or aminosilane; by oxidation of hydrosilane; or by hydrolysis of arylsilane in the presence of strong acid.
Properties
Silanols are generally dehydrated very easily, giving disiloxanes in the presence of acid, base, or even heat. Because of this property of self-condensation, the synthesis and isolation of silanols are difficult.
Silanols have hydroxy substituents, and so they have hydrogen bonding to each other in solution and even in crystals.
Silanols exist not only as chemical compounds but also on the surface of silica. From the viewpoint of organometallic chemistry, silica can be considered as an enormous ligand, and it is used as supports for catalysts of many reactions.
See also
Acknowledgement and Attribution Regarding Sources of Content
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