Polymer-analogue Dyes

PIL, an aprotic analogue with 1,3-dimethylimidazolium counter cations has been prepared as well. Branched polythiophenes with methylimidazolium bromide moieties have been introduced as novel polymeric materials that combine the characteristics of dendritic architecture, conjugated polymers, and IL groups. The IL-functionalization accounted for the good solubility in a room-temperature IL and did not significantly alter the optical absorption properties compared to the parent polythiophene, thus opening possible applications of such polymers in dye-sensitized solar cells or elec-trochromic devices. 

Many benzofuran-2-ones find application as dyes. For example, styryl analogues based on compound 262 were developed as a polymer colorant <2000W00053597>. Compounds 263 and 264 are among several stereoisomeric compounds that are patented as dyes <2000W00024736>. Dibenzofuran 265 is a photochromic compound for use as an ink or in plastic films <2001CNP1328109>. 

ROMP of the azo dye functionalized norbomene monomers 24a,b with Gmbbs catalyst gave the organometallic polymers. The photolytic cleavage of the cyclopen-tadienyliron groups yielded their organic analogues (Scheme 7.8). The M of the... 

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