| Definition
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Family of cyanine dyes that have a bridge … Family of cyanine dyes that have a bridge of three methine groups joining the two rings; inrelated cyanine, dicarbocyanine, and tricarbocyanine dyes,
this bridge contains 1, 5, and 7 methine groups, respectively. Related dyes can have minor alterations in their ring structure with either an oxygen ("cliO") or a sulfur ("diS") instead of an isopropyl group ((which yields an indole ring and hence the abbreviation "diI'). le ring and hence the abbreviation "diI').
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