Simple Synthesis, Outstanding Thermal Stability, and Tunable Light-Emitting and Optical-Limiting Properties of Functional Hyperbranched Polyarylenes

Peng, Han; Cheng, Lin; Luo, Jingdong; Xu, Kan; Sun, Qiang; Dong, Yuping; Salhi, Fouad; Lee, Priscilla P. S.; Chen, Junwu; Tang, Ben Zhong

doi:10.1021/ma020180s

Cited by 87 publications

(58 citation statements)

References 24 publications

(21 reference statements)

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“…FHBPs, which incorporate the unique properties of hyperbranched polymers and accessible fluorescence technique, exhibit various kinds of practical applications, such as live-cell imaging [41], drug delivery systems [42], solar cells [43,44], organic light-emitting diodes (OLEDs) [45][46][47][48][49][50][51], non-linear optics [52][53][54] two-photon micro/nano-lithography [55][56][57][58], optical data storage [59], and sensors [17,32,60]. Among the above, FHBPs used for chemical sensors are in a sense young fields and gaining increasing attention.…”

Section: Introductionmentioning

confidence: 99%

Stimulus responsive fluorescent hyperbranched polymers and their applications

et al. 2010

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Fluorescent hyperbranched polymers (FHBPs), which combine the versatile fluorescent property with unique characteristics of hyperbranched architecture, are desirable candidates for stimulus responsive materials. This review demonstrates the structure and environment-dependent emission behaviors of a series of FHBPs. AEE active FHBPs showing opposite performance to ACQ effect are used to sensitively detect explosives and a superamplification effect is found. Specially designed FHBPs can complex with metal ions, leading to fluorescence turn-off due to complex quenching effect. The protonation of amino-containing FHBPs exhibits pH-dependent fluorescence responses to solution acidity. Some FHBPs containing responsive moieties are photo-and thermo-sensitive, and show potential applications as smart materials. fluorescent hyperbranched polymer, explosives and metal ions detection, pH responsive, optical and thermal sensitive

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Section: Introductionmentioning

confidence: 99%

Stimulus responsive fluorescent hyperbranched polymers and their applications

et al. 2010

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“…However, the spectral properties of the synthesized oligomers were not discussed. Later, branched oligoarylenes with phenyl, fluorenyl, carbazole, and thiophene units were prepared [9,10]. The absorption and fluorescence properties were reported in these studies but the relationship of these properties to the molecular structures of the prepared oligomers was not examined.…”

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Fluorescent branched oligomers with polyphenyl and fluorenyl units

et al. 2011

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Absorption spectra and fluorescence parameters (spectra, quantum yields, and lifetimes) were obtained for a number of branched oligophenylenes (OPh) with long-wavelength chromophores such as p-quaterphenyl (OPh4-2), p-pentaphenyl (OPh5), and p-hexaphenyl (OPh6) and for oligofluorenylphenylenes (OFl) in solutions and films. It is demonstrated that the absorption spectrum of OPh4-2 is a superposition of p-quaterphenyl, p-terphenyl, and diphenyl absorption bands taken in a ~3:2:2 ratio. The obtained OPh5 and OPh6 absorption and fluorescence spectra are shown to be determined mainly by the longest-wavelength chromophores, p-pentaphenyl and p-hexaphenyl, respectively. It is demonstrated that the obtained compounds contain traces of impurities with fluorescence at longer wavelengths than that of the base material. The branched oligomers exhibit high fluorescence quantum yields in solutions, those for OPh5 and OPh6 reaching 1. Transparent fluorescent films were produced from all of the synthesized oligomers. Keywords: branched oligophenylenes and oligofluorenylphenylenes, UV absorption, fluorescence, quantum yield, fluorescence lifetime. Introduction. Advances in the chemistry of branched oligomers during the last two decades have made it possible to fabricate luminescent compounds with new molecular structures. Branched oligomers incorporating phenylenevinylene [1], phenyleneacetylene [2], carbazole [3], fluorene [4], thiophene [5], and several other chromophores were synthesized. Homogeneous films based on branched oligomers were used to fabricate new semi-conducting LEDs [6,7]. This, in turn, prompted studies on the preparation of new branched fluorescent oligomers. Let us describe in more detail branched oligophenylenes. One of the first studies [8] dedicated to branched oligophenylenes containing the diphenyl fragment as the chromophore was focused on the determination of the molecular weight distribution, thermophysical properties, and the potential for chemical modification. However, the spectral properties of the synthesized oligomers were not discussed. Later, branched oligoarylenes with phenyl, fluorenyl, carbazole, and thiophene units were prepared [9,10]. The absorption and fluorescence properties were reported in these studies but the relationship of these properties to the molecular structures of the prepared oligomers was not examined. Recently we prepared the branched oligophenylene OPh4-1 and analyzed its structure and spectral and luminescent properties [11]. It was shown that the absorption spectrum was composed of bands from the chromophores p-quaterphenyl (PQP), p-terphenyl (PTP), and diphenyl (DP) (in ~1:2:1 ratio). It was found that two optical centers were responsible for the fluorescence of OPh4-1. An anomalous fluorescent unit, p-hexaphenyl, was observed at a negligibly low concentration in the oligomer.Herein we continue spectral investigations of fluorescent oligophenylenes [11]. Three branched oligomers containing different p-phenyl chromophores (m = 2, 3, 4) and two fluorenylphenylene oli...

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“…However, for practical application, hyperbranched and star polymers showed much more potential over the structurally perfect dendrimers, since the preparation of hyperbranched or star polymers is much easier than that of dendrimers. The structural irregular hyperbranched polymers and star polymers are prepared by one-pot reactions [13][14][15][16][17][18][19][20] , whereas the structural well-defined dendrimers and star-shaped oligomers are synthesized by time-consuming stepwise reactions [21][22][23][24][25][26][27][28] . The preparation and the investigation of the property of conjugated star and hyperbranched polymers have been well documented [13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29] .…”

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confidence: 99%