Coumarin-containing methacrylate

Several coumarin-containing methacrylate (8) side-chain polymers have been prepared [106]. The optimum poling temperatures for these side-chain polymers were well above the Tg, a characteristic that is attributed to the absence of flexible spacers between the polymer chain and the bulky cou-marin chromophore. A stable of 13 pm V at 1.064 jxm was obtained at room temperature. A strong dispersion of r.vi, ranging from 2 to 12 pm V in the wavelength range 477 to 1115 nm, was observed in the electrode-poled polymers. 

This was utilized by Tian et al. [168] to prepare a new class of liquid crystal homopolymers of poly ll-[4-(3-ethoxycarbonyl-coumarin-7-oxy)-carbonyl-phenyloxy]-undecyl methacrylate] containing a coumarin moiety as a photocross-linkable unit. The preparations included polymers of various chain lengths. Also, hquid crystaUine-coil diblock and hquid crystalline-coil-liquid crystalline triblock copolymers with polystyrene as the coil segment were formed. The polymers were reported to have been synthesized with the aid of atom transfer radical polymerization. The dimerization of the coumarin moieties takes place upon irradiation with light of A > 300 nm to yield cross-linked network structures. 

Scheme 16.17 (A) Asymmetrical, bifunctional dendrimer 69 containing 16 mannose units and two coumarin chromopbores and (B) poly(methacrylate)-based glycopolymer 70 prepared by CuAAC and used for lectin binding studies with concanavalin A...

Bogdal, D. Stepien, L Sanetra, J. Gondek, E. Microwave-assisted synthesis and copolymerization of photo- and electroluminescent methacrylates containing carbazole and coumarin pendant groups. 

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