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Silanylidene groups, or silene groups are saturated hydrosilicon functional groups, which means that they consist only of hydrogen and silicon atoms and all bonds are single bonds, except for the joining bond, which is a double bond. By definition, cycles are excluded, so that the silanylidene groups comprise a homologous series of inorganic functional groups with the general chemical formula . Except for the joining atom, which has three bonds, each silicon atom has four bonds (either Si-H or Si-Si bonds), and each hydrogen atom is joined to a silicon atom (H-Si bonds). A series of linked silicon atoms is known as the silicon skeleton or silicon backbone. The simplest possible silanylidene group (the parent functional group) is silylidene, . There is no limit to the number of silicon atoms that can be linked together, the only limitation being that the functional group is acyclic, is saturated, and is a hydrosilicon. == Structure classification == Saturated hydrosilicon functional groups with a double joining bond, can be: *linear (general formula ) wherein the silicon atoms are joined in a snake-like structure *branched (general formula , ''n'' > 3) wherein the silicon backbone splits off in one or more directions *cyclic (general formula , ''n'' > 2) wherein the silicon backbone is linked so as to form a loop. According to the definition by IUPAC, the former two are silanylidene groups, whereas the third group is called cyclosilanylidene groups. Saturated hydrosilicon functional groups with a double joining bond can also combine any of the linear, cyclic (e.g., polycyclic) and branching structures, and they are still silanylidene groups (no general formula) as long as they are acyclic (i.e., having no loops). They also have single covalent bonds between their carbons. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Silanylidene group」の詳細全文を読む スポンサード リンク
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