| 释义 |
polymethine dye
noun
: any of a class of dyes (as cyanines or merocyanines) characterized by a resonance structure containing a conjugated chain of carbon atoms that is at least in part an open chain [as in −CH( = CH−CH)n = ] attached to two polar atoms (as two amino nitrogen atoms either one of which is considered to be positively charged) — see dye table I |