different between biphenanthrene vs diphenanthrene

English

biphenanthrene (plural biphenanthrenes)

(organic chemistry) Any of several isomeric aromatic hydrocarbons composed of two phenanthrene molecules joined by a single bond, but especially 1,1-biphenanthrene (or 9-9-biphenanthrene)

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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