Macromol. Rapid Commun. 2/2016

Abstract

Frontispiece: Two blue fluorescence‐emitting hyperbranched polysiloxanes are developed. The –OH rather than –NH2 group of the polymers plays a key role in forming the luminescent centers. The emissive intensity of the one carrying the NPG moiety is stronger than that of the other bearing the MPD moiety. Interestingly, the photoluminescent intensities of the hydrolyzed polymers are enhanced compared to the unhydrolyzed ones. Further details can be found in the article by S. Niu, H. Yan,* Z. Chen, L. Yuan, T. Liu and C. Liu on page 136.

Bright Blue Photoluminescence Emitted from the Novel Hyperbranched Polysiloxane‐Containing Unconventional Chromogens

“…Accordingly, we wonder whether the heteroatom with a lone pair electron in the obtained polymer, namely, oxygen atom from both the functional groups, plays a key role and its tight aggregation acts as the illuminophore in the luminescence. Here, we would like to emphasize the fact that the OH rather than SiOC in HBPSi plays an important role in forming the blue‐fluorescent species, and its dense clustering is responsible for the light emission, which has been proved in our previous work (Figure S10, Supporting Information) . Further, to have an insight into whether the epoxy group in HPHEp plays a part in the fluorescent phenomenon, we also constructed a new HBPSi almost only bearing epoxide groups (C) through the reaction of the excessive OCH 3 from A‐187 with OH from NPG (Figure S11, Supporting Information).…”

“…We recently reported a facile approach for fabricating novel HBPSi by transesterification reaction of ethoxyl groups (OC 2 H 5 ) in tetraethoxysilane with hydroxyl groups (OH) in polyols . Following this well‐proven tactic as a warranty of success, and with the objective of obtaining more functional analogues, we successfully synthesized unexpected blue fluorescence‐emitting HBPSi without bearing any luminophor and teriary amine . However, to the best of our knowledge, the light emission of the particular HBPSi has never been reported before.…”

A multifunctional silicon-containing hyperbranched epoxy: controlled synthesis, toughening bismaleimide and fluorescent properties

“…48 Moreover, linear instead of hyperbranched or dendritic polymers, such as poly(N-vinylpyrrolidone) (PVP), 49 poly[(maleicanhydride)-alt-(vinyl acetate)] (PMV) 50 and poly(ethylenimine) (PEI) 46 are also reported to be highly emissive. 53 In this work, we find that the epoxide and hydroxyl groups simultaneously contribute to the light emission. The luminescence of HBPP is ascribed to the extended p system in the phosphate structure.…”

Emission and Emissive Mechanism of Nonaromatic Oxygen Clusters

“…Unlike conventional luminescent materials containing remarkable conjugates, novel unorthodox luminophores, generally bearing electron rich moieties, have received considerable interest due to their fundamental importance, promising applications, and advantages of prominent biocompatibility, good hydrophilicity, easy preparation, environmental friendliness, etc . Despite the great progress already achieved, the exploration of such novel luminophores is still a challenge.…”

“…Despite the great progress already achieved, the exploration of such novel luminophores is still a challenge. On one hand, most of them were serendipitously discovered because the emission mechanism understanding remains in its infant stage . For instance, linear and hyperbranched poly(amide amine)s (PAMAM), poly(ether amide)s (PEA), and polyethylenimines (PEI) have been reported to be emissive, and several mechanisms, including oxidation, the formation of unsaturated hydroxylamine, and the aggregation of carbonyl groups are suggested.…”