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The prefix thio-, when applied to a chemical, such as an ion, means that an oxygen atom in the compound has been replaced by a sulfur atom. This term is often used in organic chemistry. For example, the word ether refers to an oxygen-containing compound having the general chemical structure R-O-R', where R and R' are organic residues and O is an oxygen atom. Thioether refers to an analogous compound with the general structure R-S-R' where S is a sulfur atom covalently bonded to two organic residues. A chemical reaction involving the replacement of oxygen to sulfur is called thionation or thiation. Thio- can be prefixed with di- and tri- in chemical nomenclature. The word derives from Greek ''theîon'' = "sulfur" (which occurs in Greek epic poetry as ''théweion'' and may come from the same root as Latin ''fumus'' (Indo-European ''dh-w'') and may have originally meant "fumigation substance".) ==Examples== * Thioamide * Thiocyanate * Thioether * Thioketone * Thiol * Thiophene * Thiourea * Thiosulfate 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「Thio-」の詳細全文を読む スポンサード リンク
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