Near‐infrared bis(indolium heptamethine cyanine) dyes with a spacer derived from oligo(ethylene glycol)

Abstract magnified image Synthesis of a series of near‐infrared dimeric dyes is presented. The intramolecular dimers contain two chromophores linked with a conformationally flexible ether or oligoether bridge. Optical properties of the dyes are discussed. J. Heterocyclic Chem., (2009).