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|Section2= |Section7= |Section8= }} Chrysene is a polycyclic aromatic hydrocarbon (PAH) with the molecular formula that consists of four fused benzene rings. It is a natural constituent of coal tar, from which it was first isolated and characterized. It is also found in creosote, a chemical used to preserve wood. The name "chrysene" originates from Greek ''Χρύσoς'' (''chrysos''), meaning "gold", and is due to the golden-yellow color of the crystals of the hydrocarbon, thought to be the proper color of the compound at the time of its isolation and characterization. However, high purity chrysene is colorless, the yellow hue being due to the traces of its yellow-orange isomer tetracene, which cannot be separated easily. Chrysene is formed in small amounts during the burning or distillation of coal, crude oil, and plant material. In February 2014, NASA announced a greatly upgraded database for tracking PAHs, including chrysene, in the universe.〔(NASA Ames PAH IR Spectroscopic Database )〕 According to scientists, more than 20% of the carbon in the universe may be associated with PAHs, possible starting materials for the formation of life. PAHs seem to have been formed shortly after the Big Bang, are widespread throughout the universe, and are associated with new stars and exoplanets. ==Use== Chrysene is used in the manufacture of some dyes. 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「chrysene」の詳細全文を読む スポンサード リンク
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