Photochemical behavior of poly(ethylacryloylacetate) and poly(acryloylacetone) films

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“…[8,11] Moreover, consistent with earlier reports, we observed that the keto fraction in the hydrogel increases with an increasing solvent polarity. [8,11] Moreover, consistent with earlier reports, we observed that the keto fraction in the hydrogel increases with an increasing solvent polarity.…”

“…b-diketone compounds, like acetylacetone, are known to exist in the form of enol and diketo structures, which interconvert through a tautomeric equilibrium, as illustrated in Figure 1. [8] The equilibrium between the diketo and enol forms can be shifted under illumination with UV light, in favor of the diketo form. [9] In the case of AA/AAm/MBAAm hydrogels, UV excitation at 244 nm leads to a decrease in the absorption peak at about 280 nm (corresponding to the ªchelatedº enol form) with irradiation time, as shown in Figure 2.…”

Well‐defined diblock copolymers possessing fluorescent and metal chelating functionalities as novel macromolecular sensors for amines and metal ions

“…We have chosen to combine AnMMA with AEMA, a monomer possessing bidentate β‐dicarbonyl moieties in a diblock copolymer architecture. The well‐known strong affinity of the latter to multivalent cations36 prompted some groups to synthesize polymers with β‐dicarbonyl or β‐ketoester repeating units 37–41. We first used two different routes for the preparation of well‐defined coordinating block copolymers bearing β‐ketoester functionalities involving group transfer polymerization42 and reversible addition‐fragmentation chain transfer (RAFT) polymerization 24.…”

“…The well-known strong affinity of the latter to multivalent cations 36 prompted some groups to synthesize polymers with b-dicarbonyl or b-ketoester repeating units. [37][38][39][40][41] We first used two different routes for the preparation of well-defined coordinating block copolymers bearing b-ketoester functionalities involving group transfer polymerization 42 and reversible addition-fragmentation chain transfer (RAFT) polymerization. 24 RAFT represents a versatile polymerization technique that allows for the preparation of well-defined polymers of various architectures, 43 such as block copolymers, [44][45][46][47][48] star polymers, [49][50][51] graft polymers, 52 hyperbranched polymers, [53][54][55][56] and polymer (co)networks.…”

Light driven isomerization of coordinated ligand andmodulation of fac‐[Re(CO)3(phen)(trans‐bpe)]PF6 photoluminescence in rigid media

“…The present work extends our study on metal complex sensitized intraligand photochemistry by the investigation of fac-[Re(CO) 3 (phen)(trans-bpe)] + † E-mail: neydeiha@iq.usp.br in rigid media aiming the possible use of the photoisomerizable properties of the ligand in the design and development of photochemical molecular devices. [21].…”