Poly[(maleic anhydride)-alt-(vinyl acetate)]: A Pure Oxygenic Nonconjugated Macromolecule with Strong Light Emission and Solvatochromic Effect

Abstract

Organic luminescent materials carrying no phenyl rings have attracted much interest from researchers due to their excellent biocompatibility and good biodegradability, which make them available for potential applications in a variety of biomedical areas, such as fluorescent bioprobe, drug delivery and gene carrier, and provide a new insight into the photophysical process of light emission. In this work, we studied the optical properties of poly[(maleic anhydride)-alt-(vinyl acetate)] (PMV), a pure oxygenic nonconjugated polymer and proved that the origin of its emission was associated with the clustering of the locked carbonyl groups. PMV exhibits solvatochromism: after interaction with electron-rich solvents, its absorption and emission shift to the longer wavelength region due to the formation of polymer/solvent complexes. This enables fine-tuning of its optical property by varying the solvent without the need of changing the chromophore.

Aggregation-induced emission: mechanistic study of the clusteroluminescence of tetrathienylethene

“…Such an effect has been primarily observed in systems with an abundance of oxygen atoms, 36 such as carbonyl and ester functional groups. The well-aligned oxygen atoms and the intensive interactions between the oxygens that have been found in the theoretical packing of the polymer chains, are the major factors that are thought to be responsible for the clusteroluminogenic effect.…”

Synthesis, structures and aggregation-induced emissive properties of copper(I) complexes with 1H-imidazo[4,5-f][1,10]phenanthroline derivative and diphosphine as ligands

“…The lower-energy absorption bands with maximum wavelengths in the range of 411−431 nm and ε in the range of 8320−9640 M −1 cm −1 are assigned to dπ(Cu)→π*(diimine) metal-to-ligand charge transfer (MLCT) transitions, mixing with some charge transfer character from diphosphine ligand to diimine ligands within the cation. Such assignments base on the results of density functional theory (DFT) calculation of complex [Cu(dmbpm)(POP)]BF 4 (dmbpm = 4,4′-dimethyl-2,2′-bipyrimidine), which showed the frontier orbitals of [Cu(dmbpm)(POP)]BF4 , LUMO and LUMO+1 were located mainly at dmbpm, and HOMO and HOMO−1 were mainly centered on the copper and POP[46].…”

Enhanced Fluorescence Properties of Stilbene‐Containing Alternating Copolymers

“…Previous studies on the fluorescence of maleic anhydride or maleimide‐containing polymers attributed the fluorescence to clustering of the locked carbonyl groups or the “space conjugate” of the carbonyl and the neighboring phenyl groups . For our alternating copolymers, it is likely that the fluorescence of 330 nm irradiation also comes from the π–π interactions between the phenyl rings and CO groups from the anhydride groups through space.…”