Syntheses and Characteristics of Water-Soluble, Pyridine-Based Poly(aryleneethynylene)s

Seehafer, Kai; Bender, Markus; Schwaebel, S. Thimon; Bunz, Uwe H. F.

doi:10.1021/ma5018296

Cited by 15 publications

(5 citation statements)

References 28 publications

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“…The fluorescence of Si-PAMAM added with Hg 2+ decreased to nearly zero, suggesting that the fluorescence of Si-PAMAM was extremely sensitive to Hg 2+ . The reason of quenching for Hg 2+ was probably due to the heavy atom effect, 26 whereas the metal cation complexes led to quenching. In general, heavy atoms quench the fluorescence.…”

Section: Resultsmentioning

confidence: 99%

Controllable photophysical properties and self-assembly of siloxane-poly(amidoamine) dendrimers

Zhang

Feng

2015

Phys. Chem. Chem. Phys.

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Poly(amidoamine) dendrimers are typical luminescent polymers containing unconventional chromophores. A series of novel siloxane-poly(amidoamine) (Si-PAMAM) dendrimers were synthesized and investigated in this study. Their structures and properties were determined by NMR, XPS, LC/MS, and fluorescence spectroscopy. The introduction of Si-O-Si units in Si-PAMAM changed the photophysical properties of the dendrimers. The luminescence of Si-PAMAM was associated with the aggregation of its carbonyl groups, which was caused by N → Si coordination bonds. The strong blue luminescence of Si-PAMAM was also studied in detail, and it was found to be quite different from the ethanediamine-based poly(amidoamine). Results indicated that the luminescence of Si-PAMAM could be controlled by solvents, acids, metal ions, temperature, or degree of aggregation of the carbonyl groups. Moreover, micron-sized tubes composed of Si-PAMAM molecules were generated and found in water/methanol solution.

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Section: Resultsmentioning

confidence: 99%

Controllable photophysical properties and self-assembly of siloxane-poly(amidoamine) dendrimers

Zhang

Feng

2015

Phys. Chem. Chem. Phys.

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“…Furthermore, the decrease in fluorescence intensity is small for the Co 2+ , Ni 2+ , and Cu 2+ ions but becomes more significant for Fe 2+ and Fe 3+ , in particular, for Fe 3+ . Among these metal ions, Fe 3+ can form the strongest interaction with AG-1 because it holds the largest charge/radius ratio; 40 thus, it presents with the largest decrease in fluorescence intensity observed. Moreover, the influence of Fe 3+ concentrations on the luminescence intensity of the polyester was also determined.…”

Section: Acs Sustainable Chemistry and Engineeringmentioning

confidence: 99%

Unanticipated Strong Blue Photoluminescence from Fully Biobased Aliphatic Hyperbranched Polyesters

Yan

Huang

et al. 2017

ACS Sustainable Chem. Eng.

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Nonconventional fluorescent polymers without π-aromatic structure have attracted extensive interest in recent years. Hyperbranched polyesters are generally known because of their industrial applications; however, the luminescent properties of the polyester has not been reported. Herein, we synthesized a series of fully biobased aliphatic hyperbranched polyesters via a one-pot A2 + B3 esterification reaction. Intriguingly, the resultant hyperbranched polyesters carrying no conventional fluorescent units exhibited unexpected bright blue fluorescence under 365 nm UV light. It was found that the fluorescence intensity was enhanced with increasing solution concentrations and molecular weights of the polyesters. Moreover, the results suggested that the luminescence of polyesters could be controlled by solvents and metal ions. In particular, the fluorescence of the polyesters was extremely sensitive to Fe3+. More interesting is that the fluorescence of the polyesters showed an aggregation-induced enhanced emission in the mixture system. Notably, the resulting polyesters displayed a remarkably enhanced quantum yield (16.75%) as compared with that of other types of these polymers. Preliminary results demonstrate that clustering of the carbonyl groups is responsible for the unusual fluorescence in the aliphatic hyperbranched polyesters, namely, clustering-induced emission (CIE). This study provides a novel perspective for the design of biobased luminescent materials to new application areas.

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“…Fe 3+ was selected as the coordinated metal ion because of its large charge/radius. The experiments are presented in the Supporting Information. , Instead of forming six coordination bonds, steric hindrance and entanglement of the polymer chains reduced the efficiency of Fe 3+ coordination and resulted in tough elastomers when the value of n (N + CO)/ n (Fe 3+ ) < 6. The tensile strength of E-11-Fe-3-880 without fillers could reach 3.45 MPa, which is much higher than the tensile strength of previously reported silicon elastomers. − The tensile strengths of the other samples are shown in the Supporting Information.…”

Section: Resultsmentioning

confidence: 99%

Self-Recoverable Dual-Network Silicon Elastomer Applied in Cell Adhesives

Wang³

et al. 2019

ACS Appl. Polym. Mater.

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Dual-network filler-free silicon elastomers with excellent mechanical properties and high tensile strength (>3 MPa) were fabricated through physical and chemical crosslinking via Fe 3+ ion coordination and aza-Michael addition, respectively. Dynamic mechanical analysis and loading− unloading tests were used to analyze the sacrificial bonds and dual networks in the elastomers. Continuous-wave electron paramagnetic resonance results revealed the incomplete coordination and similar chemical environment of Fe(III) ions in the elastomers. The coordination bonds dissipated energy, and the chemical cross-linking maintained the networks; they enhanced tensile strength jointly. The elastomers demonstrated favorable self and shape recoverability due to the dynamic reversibility of the coordination bonds and the stress of the chemical cross-linking in the reshaped elastomers. Such elastomers could be used as intelligent and sustainable materials. Moreover, the materials exhibited good biocompatibility and can be utilized as a type of cell adhesive in bioimaging.

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Syntheses and Characteristics of Water-Soluble, Pyridine-Based Poly(aryleneethynylene)s

Cited by 15 publications

References 28 publications

Controllable photophysical properties and self-assembly of siloxane-poly(amidoamine) dendrimers

Controllable photophysical properties and self-assembly of siloxane-poly(amidoamine) dendrimers

Unanticipated Strong Blue Photoluminescence from Fully Biobased Aliphatic Hyperbranched Polyesters

Self-Recoverable Dual-Network Silicon Elastomer Applied in Cell Adhesives

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