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chemjl

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专业: 微生物生理与生物化学

[交流] 求助英译汉（化学类配合物纳米材料相关）

Multicarboxyl polymer-functionalized halloysite nanotubes (HNTs) were synthesized by controlled surface-initiated atom transfer radical polymerization (SI-ATRP) of methyl methacrylate (MMA) and/or hydroxyethyl methacrylate (HEMA) to form HNT-(PMMA-b-PHEMA) or HNT-PHEMA hybrids, followed by esteriﬁcation
of the hydroxyl groups on the PHEMA blocks using excessive succinic anhydride in pyridine. The obtained products, HNT-(PMMA-b-PSEMA) or HNT-PSEMA with multicarboxyl groups on the external layers, were coordinated with triplet europium ions (Eu3+) in the presence of 1,10-phenanthroline (phen). For comparison purposes, PSEMA and PMMA-b-PSEMA copolymer were also synthesized via the same procedure and used as macromolecular ligands for coordination with Eu3+. The microstructure and ﬂuorescence properties of the
four kinds of Eu3+ coordination complexes were characterized via FTIR, FESEM, EDS,1H NMR, TGA, and ﬂuorescence spectroscopy. The conversion of hydroxyl groups to carboxyl groups during the esteriﬁcation reactions was up to 100% for the synthesized polymers and modiﬁed HNT-based hybrids. The Eu3+ coordination
HNT-based hybrids exhibited efﬁcient narrow bandwidth emission of red light with high spectral purity when excited at 266 nm. The HNT-(PMMA-b-PSEMA)-Eu complex even gave 1.63 and 1.85 times higher
emission intensities than those of HNT-PSEMA-Eu and (PMMA-b-PSEMA)-Eu complexes, respectively.
The improved luminescence properties of both of the Eu3+ coordination HNT-based hybrids are attributable
to the efﬁcient intramolecular energy transfer from the hybrid ligands and phen to Eu3+ ions, and the rigid
HNTs framework also plays a positive role in the enhancement of the emission intensity. Such photoluminescent
Eu3+ coordination HNT-based hybrids are expected for spectroscopy probes, ﬂuorescent plastics, and
ﬂuoroimmunoassay applications.

出处：J. Phys. Chem. C 2009, 113, 16238–16246
Synthesis and Characterization of Photoluminescent Eu(III) Coordination Halloysite Nanotube-Based Nanohybrids
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slowstar

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多羧基聚合物功能化埃洛石纳米管（HNTs）HNT-(PMMA-b-PHEMA) 或HNT-PHEMA杂合体可通过甲基丙烯酸甲酯（MMA）和/或甲基丙烯酸-2-羟乙酯（HEMA）的受控表面引发原子转移自由基聚合（SI-ATRP）合成得到，然后在吡啶(Py)里用过量的丁二酸酐将PHEMA（聚甲基丙烯酸-2-羟乙酯）嵌段聚合物上的羟基酯化。所得端基含多羧基基团的HNT-(PMMA-b-PSEMA) 或HNT-PSEMA产物再与三价铕离子（Eu3+）在1，10-菲咯啉（phen）存在下配位络合。为了对比，用上述相同的路线合成了PSEMA及PMMA-b-PSEMA的共聚物作为大分子配体与Eu3+了配位络合。用FTIR，FESEM, EDS, 1H NMR, TGA和荧光光谱测定了这四种Eu3+配位络合物的微观结构和荧光性质。对于所合成的聚合物和改性HNT基杂合体，在酯化反应这一步羟基100%转化为了羧基。Eu3+配位的HNT基杂合体在266nm受激发时展现了高效的红光窄带发射并且具有很高的光谱纯度。HNT-(PMMA-b-PSEMA)-Eu络合物甚至具有比HNT-PSEMA-Eu和（PMMA-b-PSEMA）-Eu络合物分别高1.63和1.85倍的发射强度。Eu3+络合物和HNT基杂合体的发光性质的提高可归因于杂化体配体及phen与Eu3+离子间的高效分子内能量转移，同时HNTs的刚性骨架也对发射强度的提高起到了促进作用。这样的光致发光Eu3+配位HNT基杂合体有望应用于光谱探针，荧光塑料以及荧光免疫测定。