Fluorescence Investigations of Oxygen‐Doped Simple Amine Compared with Fluorescent PAMAM Dendrimer

Abstract

Blue emission of oxygen-doped tertiary amine (triethylamine), a key unit of fluorescent poly(amido amine) dendrimer, was demonstrated. It was found that the fluorescence intensity could be further enhanced if the tertiary amines locate densely in the dendrimer interior as the branching sites. Moreover, a solvatochromic phenol blue, instead of oxygen, is able to induce the blue fluorescence of the tertiary amino-branching sites based on a guaranteed host-guest complexation of phenol blue molecules and dendrimer interior.

Synthesis and Fluorescent Properties of Biodegradable Hyperbranched Poly(amido amine)s

“…This indicates that the tertiary amine inside the hyperbranched structure of HPAMAM plays a key role for the photoluminescence, which is similar to the result reported. [15] The fluorescence did not disappear completely in Figure 1b, probably because the quaternization of amine in the hyperbranched polymers was not completed, as shown by the weak proton signals of methylene groups next to tertiary N atoms still remaining in Figure S3B.…”

“…As we know, the higher the molecular weight of the hyperbranched polymers, the tighter the structures of the polymer formed, the tertiary amines inside the tight hyperbranched interior lead to strong photoluminescence and a red-shifted emission. [15] To study the effect of the HPAMAM concentration on fluorescence, the UV-Vis and fluorescence spectra of the HPAMAMs with various concentrations were measured, and the results are shown in Figure 2c and d. Interestingly, the absorption band at 360 nm strengthened and the emission intensity at 470 nm increased with increasing polymer concentration, and strong fluorescence was observed even in the solid state. Probably, HPAMAM at high concentration contains more tertiary amine units, and the increase of HPAMAM concentration does not significantly affect the photoluminescence of the fluorescent units inside the hyperbranched polymers; thus, strong fluorescence for the HPAMAM solution with high concentration was observed.…”

Luminescent Polymers Containing Unconventional Chromophores

“…(B) pH dependent fluorescent behavior of hydroxyl functionalized PAMAM-G4 aqueous solution [6] 2007 年, 复旦大学府寿宽教授课题组也注意到 hb-PAMAM 的荧光发射现象. Cao 等 [7] 采用二乙基三胺 与丙烯酸甲酯在不同配料比下进行反应, 获得一系列 [9] . 证明脂肪胺中的胺基是发光活性中心的更直接证 据来自 2007 年西班牙巴伦西亚大学 Stiriba 课题组 [10] 对 超支化聚乙二胺(hb-PEIs)和线性聚乙二胺(l-PEIs)发光 行为的研究.…”

Unraveling the Photoluminescence Puzzle of PAMAM Dendrimers

“…[4] However, the utilization potential of PAMAM dendrimers is still hindered by a key problem: a photoluminescence puzzle of PAMAM dendriA C H T U N G T R E N N U N G mers treated with peroxide reagents. [5] Herein, we first demonstrate the photoluminescence of PAMAM dendrimers from an unsaturated hydroxylamine, which was generated from oxidizermediated breakdown of dendritic structures through a cascade of oxidation and subsequent elimination reactions (Scheme 1).…”