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RESEARCH PRODUCT
Near infrared dyes by combination of squaraine and ferrocene chromophores
Ralf PetermannHerbert Meiersubject
chemistry.chemical_classificationChloroformOrganic ChemistryNear-infrared spectroscopyChromophorePhotochemistryBiochemistrychemistry.chemical_compoundchemistryFerroceneDrug DiscoveryAbsorption (chemistry)SolubilityAlkylDichloromethanedescription
Abstract Squaraines represent a class of compounds which attracts a lot of attention in materials science. A synthetic sequence for the preparation of the symmetrical squaraines 12a , b , which contain ferrocene units as electron donors, is described. The compounds exhibit, in dichloromethane or chloroform, two intense absorption bands. One of them is located at 641/650 nm—a normal region for squaraines; however, the other band is strongly shifted to long wavelengths and has its maximum at 921/961 nm. Alkyl sidechains enhance the solubility of 12a , b , which represent a new type of NIR dyes.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2000-07-01 | Tetrahedron Letters |