Coordination-Enhanced Luminescence on Tetra-Phenylethylene-Based Supramolecular Assemblies.

Coordination-Enhanced Luminescence on Tetra-Phenylethylene-Based Supramolecular Assemblies.
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基于四苯乙烯的超分子组装体的配位增强发光

DOI:
10.3390/molecules23020363
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发表时间:
2018-02-09
期刊:
Molecules (Basel, Switzerland)
影响因子:
--
通讯作者:
Sun QF
Sun QF
中科院分区:
其他
文献类型:
--
作者:
Yan QQ;Hu SJ;Zhang GL;Zhang T;Zhou LP;Sun QF

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具有聚集诱导发光(AIE)性质的材料由于其在发光器件、化学/生物传感器和生物医学诊断等方面的潜在应用而受到越来越多的关注。通常,AIE需要由不良溶剂或共价连接到聚合物链的AIEgens的紧密排列诱导的AIEgens的强制聚集。在这里,我们报告了两个协调增强的荧光超分子配合物,其特点是通过自组装的四苯乙烯(TPE)为基础的四齿(La)和二齿(Lb)配体和顺式Pd(en)(NO3)2(en =乙二胺)单元的分级限制的分子内运动。虽然自由配体在稀溶液中是不发射的,并且在混合溶剂体系和固态中均显示出典型的AIE性质,但自组装配合物在溶液状态下保持其荧光性质。特别是,Pd 4(La)2配合物在稀溶液中显示出比La显着的6倍荧光增强。我们预计这类配位增强的发射超分子将在生物医学传感或标记中找到应用。
Materials with aggregation-induced emission (AIE) properties have received increased attention recently due to their potential applications in light-emitting devices, chemo/biosensors and biomedical diagnostics. In general, AIE requires the forced aggregation of the AIEgens induced by the poor solvent or close arrangement of AIEgens covalently attached to polymer chains. Here, we report two coordination-enhanced fluorescent supramolecular complexes featuring hierarchically restricted intramolecular motions via the self-assembly of tetraphenylethylene (TPE)-based tetra-dentate (La) and bidentate (Lb) ligands and the cis-Pd(en)(NO3)2 (en = ethylenediamine) unit. While the free ligands are non-emissive in dilute solution and show typical AIE properties in both mixed solvent system and the solid state, the self-assembled complexes maintain their fluorescent nature in the solution state. In particular, the Pd4(La)2 complex shows remarkable 6-fold fluorescent enhancement over La in dilute solution. We anticipate that these kinds of coordination-enhanced emissive supramolecules will find applications in biomedical sensing or labeling.
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发表时间: 1996-01-01
影响因子: 4.3
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