scholarly journals Narcissistic Self-Sorting and Enhanced Luminescence via Catenation in Water

2021 ◽  
Author(s):  
Qiong Chen ◽  
Ye Lei ◽  
Hongye Wang ◽  
Guangcheng Wu ◽  
Wenwen Xu ◽  
...  
Keyword(s):  
Conceptual Model ◽  
Excited States ◽  
Self Assembly ◽  
Luminescent Materials ◽  
Enhanced Fluorescence ◽  
Enhanced Luminescence ◽  
Intramolecular Motions

Abstract Narcissistic self-sorting, namely that components are able to distinguish “self” from “nonself” during self-assembly, was accomplished via catenation by condensing multiple hydrazides and an aldehyde, or a hydrazide and multiple aldehydes in water. The underneath mechanism of this behavior relies on the corresponding homo [2]catenanes are thermodynamically more favored than their hetero counterparts, because the former containing two identical macrocyclic components are able to maximize the inter-component noncovalent forces. One of these catenanes contains four 4-phenylpyridinium units, which are often considered barely luminescent due to intramolecular rotations and vibrations that lead to nonradiative annihilation of their excited states. These intramolecular motions, however, are restricted upon integrating 4-phenylpyridiniums within the catenane architecture. As a consequence, compared to its non-interlocked counterparts, this catenane exhibits enhanced fluorescence, which represents a novel conceptual model for developing luminescent materials.

Rapid Degradation of Rhodamine B over Cyclodextrin Modified TiO2

2011 ◽  
Vol 694 ◽  
pp. 764-768
Author(s):  
Xu Zhang ◽  
Nan Sheng Deng
Keyword(s):  
Electron Transfer ◽  
Excited States ◽  
Rhodamine B ◽  
Self Assembly ◽  
Initial Rate ◽  
Solar Irradiation ◽  
Pollutant Degradation ◽  
Rapid Degradation ◽  
Hybrid Nanomaterial ◽  
Simulated Solar Irradiation

A novel β-cyclodextrin (β-CD) grafted titanium dioxide (TiO2/β-CD) was synthesized through photo-induced self assembly methods, and its structure was characterized. The TiO2/β-CD hybrid nanomaterial showed high photoactivity under visible light irradiation (λ  400 nm and/or λ  420 nm) and simulated solar irradiation (λ  365 nm). Photodegradation of rhodamine B followed the Langmuir–Hinshelwood kinetics model. The initial rate R0 of rhodamine B degradation increased by 4.6, 2.4 and 1.5 times in the irradiation conditions of λ  420 nm, λ  400 nm and λ  365 nm, respectively. β-CD increased the lifetimes of the excited states of the unreactive guests and facilitated the electron transfer from the excited dye to the TiO2 conduction band, which enhanced the dye pollutant degradation.

DNA Nanoribbon‐Templated Self‐Assembly of Ultrasmall Fluorescent Copper Nanoclusters with Enhanced Luminescence

2020 ◽  
Vol 59 (29) ◽  
pp. 11836-11844 ◽  
Author(s):  
Xiangyuan Ouyang ◽  
Meifang Wang ◽  
Linjie Guo ◽  
Chengjun Cui ◽  
Ting Liu ◽  
...  
Keyword(s):  
Self Assembly ◽  
Copper Nanoclusters ◽  
Enhanced Luminescence

Aurophilic Interactions in the Self‐Assembly of Gold Nanoclusters into Nanoribbons with Enhanced Luminescence

2019 ◽  
Vol 131 (24) ◽  
pp. 8223-8228 ◽  
Author(s):  
Zhennan Wu ◽  
Yonghua Du ◽  
Jiale Liu ◽  
Qiaofeng Yao ◽  
Tiankai Chen ◽  
...  
Keyword(s):  
Self Assembly ◽  
Gold Nanoclusters ◽  
The Self ◽  
Enhanced Luminescence ◽  
Aurophilic Interactions

scholarly journals Supramolecular complexes of cobalt(II), manganese(II) and cadmium(II) with bis(terpyridine) ligand as novel luminescent materials

2013 ◽  
Vol 15 (3) ◽  
pp. 91-95 ◽  
Author(s):  
Monika Wałęsa-Chorab ◽  
Adam Gorczyński ◽  
Damian Marcinkowski ◽  
Zbigniew Hnatejko ◽  
Violetta Patroniak
Keyword(s):  
Transition Metal ◽  
Metal Ions ◽  
Electronic Absorption ◽  
Self Assembly ◽  
Emission Spectra ◽  
Transition Metal Ions ◽  
Supramolecular Complexes ◽  
Luminescent Materials ◽  
Absorption And Emission ◽  
Counter Ions

Abstract Self-assembly of N6-donor bis(terpyridine) ligand L with transition metal ions: Co(II), Mn(II) and Cd(II) leads to a formation of three kinds of supramolecular complexes. In the electronic absorption and emission spectra of supramolecular complexes additional bands were observed what was ascribed to the coordination of ligand molecules to metal ions. Luminescence properties of these complexes strongly depend on the kind of metal ions and counter ions. The effective blue luminescence was observed in the case of Mn(II) and Cd(II) complexes in which all N-donor atoms of ligand molecules coordinate with the metal center

scholarly journals Quantum dots on vertically aligned gold nanorod monolayer: plasmon enhanced fluorescence

Nanoscale ◽  
2014 ◽  
Vol 6 (11) ◽  
pp. 5592-5598 ◽  
Author(s):  
Bo Peng ◽  
Zhenpeng Li ◽  
Evren Mutlugun ◽  
Pedro Ludwig Hernández Martínez ◽  
Dehui Li ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Energy Transfer ◽  
Self Assembly ◽  
Gold Nanorod ◽  
Enhanced Fluorescence ◽  
Plasmon Enhanced Fluorescence ◽  
Evaporation Induced Self Assembly ◽  
Vertically Aligned

A vertically aligned CTAB-coated Au nanorod monolayer was formed by the evaporation-induced self-assembly, which provides a unique anisotropic plasmonic system to investigate the energy transfer between the plasmonic array and fluorophores.

Enhanced Fluorescence Emission of Bonding Type Rare Earth Complexes Eu(MAA)3Phen

2017 ◽  
Vol 898 ◽  
pp. 1839-1843 ◽  
Author(s):  
Bin Wang ◽  
Lu Lu Xiao ◽  
Heng Xue Xiang ◽  
Bin Sun ◽  
Mei Fang Zhu
Keyword(s):  
Rare Earth ◽  
Fluorescence Spectra ◽  
Central Atom ◽  
Fluorescence Emission ◽  
Ion Concentration ◽  
Luminescent Materials ◽  
Enhanced Fluorescence ◽  
Rare Earth Ion ◽  
Element Analysis ◽  
Phenanthroline Monohydrate

Rare earth fluorescent complexes monomer with activated double bonds was synthesized by using Eu as the central atom, Methacrylic acid and 1, 10-Phenanthroline monohydrate as ligand. The structure of resultant Eu (MAA)3Phen was determined by infrared spectrum, ultraviolet spectrum and element analysis, and the fluorescence property of the complexes was tested by fluorescence spectra and fluorescence microscopy. Compared with conventional luminescent materials, this resultant complexes show greater fluorescence intensity. The analysis has revealed that with the increase of rare earth ion concentration from 4×10-5mol·L-1 to 4×10-3mol·L-1, the fluorescence quenching phenomenon appeared in the complexes solution.

Ultra-Large Unilamellar Nanosheets Efficiently Exfoliated from (Y0.95Eu0.05)2(OH)5NO3·nH2O and their Self-Assembly into Oriented Oxide Film with Enhanced Photoluminescence Properties

2014 ◽  
Vol 602-603 ◽  
pp. 1017-1020 ◽  
Author(s):  
Qi Zhu ◽  
J.G. Li ◽  
Xiao Dong Li ◽  
Xu Dong Sun
Keyword(s):  
Rare Earth ◽  
Self Assembly ◽  
Reaction System ◽  
Photoluminescence Properties ◽  
Electronic Components ◽  
High Quality ◽  
Rare Earth Nitrate ◽  
Enhanced Photoluminescence ◽  
Hexagonal Shape ◽  
Enhanced Luminescence

Two dimensional nanophosphors of high quality play an important role in the miniaturization and intelligentization of opto-electronic components. In this present work, ultra-large (30μm) single crystals of (Y0.95Eu0.05)2(OH)5NO3·nH2O layered rare earth hydroxide (LRH) with a hexagonal shape have been synthisized via autoclaving the rare-earth nitrate/NH4OH reaction system in the presence of ammonium nitrate (NH4NO3). The nitrate ions, existing in the interlayer gallery of layered rare earth hydroxide, exhibit facile exchanges with oleate anions by hydrothermal anion exchange. Furthermore, the interlayer distance can thus be expanded from ~0.9 nm for the pristine LRHs to ~3.60 nm for the intercalated ones, which are then efficiently delaminated into unilamellar nanosheets with a lateral size of 10μm and a thickness of ~1.50 nm. The obtained nanosheets are single crystaline. Highly [11 oriented, dense (Y0.95Eu0.05)2O3 phosphor films with excellent optical transparency and a greatly enhanced luminescence intensity have been constructed via self-assembly of ultra-large unilamellar LRH nanosheets, followed by proper annealing.

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