different between acridine vs acridinium

English

acridine (countable and uncountable, plural acridines)

(uncountable, organic chemistry) A tricyclic aromatic heterocycle, dibenzopyridine, obtained from coal tar; it is used in the manufacture of dyes and drugs
(countable, organic chemistry) Any of many derivatives of this compound

acridine f

acridine +? -ium

acridinium (plural acridiniums)

(organic chemistry, especially in combination) Any cation produced by protonation of an acridine.

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