different between phenanthrene vs diphenanthrene

English

From phen(o)- +? anthr(ac)ene.

phenanthrene (countable and uncountable, plural phenanthrenes)

(organic chemistry) A tricyclic aromatic hydrocarbon obtained from coal tar; used in the manufacture of dyes, pharmaceuticals and explosives; it is isomeric with anthracene.

di- +? phenanthrene

diphenanthrene (uncountable)

(organic chemistry) Any of several isomeric aromatic hydrocarbons, analogous to biphenyl, formed from two phenanthrene moieties joined by a single bond

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