Supramolecular Assembly of U(IV) Clusters and Superatoms

2020 ◽  
Author(s):  
Ian Colliard ◽  
Gregory Morrosin ◽  
Hans-Conrad zur Loye ◽  
May Nyman
Keyword(s):  
Quantum Dots ◽  
Supramolecular Assembly ◽  
Emergent Properties ◽  
Organic Media ◽  
Body Centered Cubic ◽  
Cluster Anions ◽  
Charge Balance ◽  
Interpenetrating Networks ◽  
Hierarchical Assembly ◽  
Two Parameters

Superatoms are nanometer-sized molecules or particles that can form ordered lattices, mimicking their atomic counterparts. Hierarchical assembly of superatoms gives rise to emergent properties in superlattices of quantum-dots, p-block clusters, and fullerenes. Here, we introduce a family of uranium-oxysulfate cluster anions whose hierarchical assembly in water is controlled by two parameters; acidity and the countercation. In acid, larger Ln<sup>III</sup> (Ln=La-Ho) link hexamer (U<sub>6</sub>) oxoclusters into body-centered cubic frameworks, while smaller Ln<sup>III</sup> (Ln=Er-Lu &Y) promote linking of fourteen U<sub>6</sub>-clusters into hollow superclusters (U<sub>84</sub> superatoms). U<sub>84</sub> assembles into superlattices including cubic-closest packed, body-centered cubic, and interpenetrating networks, bridged by interstitial countercations, and U<sub>6</sub>-clusters. Divalent transition metals (TM=Mn<sup>II </sup>and Zn<sup>II</sup>), with no added acid, charge-balance and promote the fusion of 10 U<sub>6</sub> and 10 U-monomers into a wheel–shaped cluster (U<sub>70</sub>). Dissolution of U<sub>70</sub> in organic media reveals (by small-angle Xray scattering) that differing supramolecular assemblies are accessed, controlled by TM-linking of U<sub>70</sub>-clusters. <br>

Supramolecular Assembly of U(IV) Clusters and Superatoms

2020 ◽  
Author(s):  
Ian Colliard ◽  
Gregory Morrosin ◽  
Hans-Conrad zur Loye ◽  
May Nyman
Keyword(s):  
Quantum Dots ◽  
Supramolecular Assembly ◽  
Emergent Properties ◽  
Organic Media ◽  
Body Centered Cubic ◽  
Cluster Anions ◽  
Charge Balance ◽  
Interpenetrating Networks ◽  
Hierarchical Assembly ◽  
Two Parameters

Superatoms are nanometer-sized molecules or particles that can form ordered lattices, mimicking their atomic counterparts. Hierarchical assembly of superatoms gives rise to emergent properties in superlattices of quantum-dots, p-block clusters, and fullerenes. Here, we introduce a family of uranium-oxysulfate cluster anions whose hierarchical assembly in water is controlled by two parameters; acidity and the countercation. In acid, larger Ln<sup>III</sup> (Ln=La-Ho) link hexamer (U<sub>6</sub>) oxoclusters into body-centered cubic frameworks, while smaller Ln<sup>III</sup> (Ln=Er-Lu &Y) promote linking of fourteen U<sub>6</sub>-clusters into hollow superclusters (U<sub>84</sub> superatoms). U<sub>84</sub> assembles into superlattices including cubic-closest packed, body-centered cubic, and interpenetrating networks, bridged by interstitial countercations, and U<sub>6</sub>-clusters. Divalent transition metals (TM=Mn<sup>II </sup>and Zn<sup>II</sup>), with no added acid, charge-balance and promote the fusion of 10 U<sub>6</sub> and 10 U-monomers into a wheel–shaped cluster (U<sub>70</sub>). Dissolution of U<sub>70</sub> in organic media reveals (by small-angle Xray scattering) that differing supramolecular assemblies are accessed, controlled by TM-linking of U<sub>70</sub>-clusters. <br>

Templated and Hierarchical Assembly of CdSe/ZnS Quantum Dots

2004 ◽  
Vol 16 (15) ◽  
pp. 1341-1345 ◽  
Author(s):  
Y. Babayan ◽  
J. E. Barton ◽  
E. C. Greyson ◽  
T. W. Odom
Keyword(s):  
Quantum Dots ◽  
Hierarchical Assembly

A biocompatible cobaltporphyrin-based complex micelle constructed via supramolecular assembly for oxygen transfer

2016 ◽  
Vol 4 (5) ◽  
pp. 857-862 ◽  
Author(s):  
Liangliang Shen ◽  
Rui Qu ◽  
Hejin Shi ◽  
Fan Huang ◽  
Yingli An ◽  
...  
Keyword(s):  
Ethylene Glycol ◽  
Diblock Copolymer ◽  
Oxygen Transfer ◽  
Supramolecular Assembly ◽  
Poly Ethylene Glycol ◽  
Hierarchical Assembly ◽  
Poly Ethylene ◽  
Copolymer Poly

Herein, a complex micelle as an oxygen nano-carrier is constructed through the hierarchical assembly of the diblock copolymer poly(ethylene glycol)-block-poly(l-lysine) (PEG-b-PLys), tetrakis(4-sulfonatophenyl)porphinato cobalt(ii) (Co(ii)TPPS), a heptapeptide (Cys-His-His-His-His-His-His) and heptakis(2,3,6-tri-O-methyl)-β-cyclodextrin (TM-β-CD).

The pathway and kinetics of hierarchical assembly of ionic oligomers into a lyotropic columnar phase

Soft Matter ◽  
2019 ◽  
Vol 15 (22) ◽  
pp. 4460-4466
Author(s):  
Weiheng Huang ◽  
Shenghui Wei ◽  
Daan Frenkel ◽  
Ningdong Huang
Keyword(s):  
Liquid Crystal ◽  
Supramolecular Assembly ◽  
Lyotropic Liquid Crystal ◽  
Crystal Phase ◽  
Liquid Crystal Phase ◽  
Hierarchical Assembly ◽  
Columnar Phase ◽  
Kinetics Of

In situ investigations on the formation of a lyotropic liquid crystal phase through supramolecular assembly in solution suggest a multi-step pathway.

scholarly journals Binding Energy of Exciton in Quantum Dots with the Central-cell Correction Depending on the Dot Sizes

2007 ◽  
Vol 14 (2) ◽  
pp. 95-99 ◽  
Author(s):  
To Thi Thao ◽  
Nguyen Ai Viet
Keyword(s):  
Quantum Dots ◽  
Binding Energy ◽  
Variational Methods ◽  
Effective Mass ◽  
Short Range ◽  
Central Cell ◽  
Short Range Potential ◽  
Two Parameters ◽  
Center Cell ◽  
Good Agreement

The binding energy of exciton in quantum dots with a parabolic confinement potential was calculated by variational methods beyond the Kohn-Luttinger effective mass theory, when the central-cell correction was taken into account.We have assumed that a short range potential with two parameters for strength and range for exciton, representing the center-cell effect also depends on dot size. Our result is in good agreement with experiment.

Optical detection of quantum entanglement between two quantum dots mear a metal nanoparticle

2013 ◽  
Vol 13 (3&4) ◽  
pp. 324-333
Author(s):  
Yong He ◽  
Ka-Di Zhu
Keyword(s):  
Quantum Dots ◽  
Quantum Entanglement ◽  
Energy Difference ◽  
Pump Intensity ◽  
Limited Range ◽  
Metal Nanoparticle ◽  
Entangled State ◽  
Destructive Interference ◽  
Novel Approach ◽  
Two Parameters

We theoretically study the interaction between two semiconductor quantum dots (SQDs) and a metal nanoparticle\ (MNP) within the quantum description. The plasmon field produced in the MNP excited by the external field can play the platform of F\"{o}rster energy transfer between two SQDs which gives rise to the generation of entangled states. The Fano effect can be shown in the energy absorption spectrum of MNP, which originates from constructive or destructive interference between two competing optical pathways. Since the generated entangled state is in one pathway, the steady-state concurrence of entanglement can be evaluated by the observation of Fano profile. Because the concurrence of two SQDs is determined by both the pump intensity and the energy difference, one can properly choose these two parameters for detecting the non-negligible entanglement. When the pump intensity is very strong, there is no entanglement. The method to observe entanglement with the Fano profile, so, has a limited range of applicability. The optical observation is a novel approach to reveal entanglement. It may be used to optically detect quantum entanglement in many solid-state systems.

Hierarchical assembly of metal nanoparticles, quantum dots and organic dyes using DNA origami scaffolds

2013 ◽  
Vol 9 (1) ◽  
pp. 74-78 ◽  
Author(s):  
Robert Schreiber ◽  
Jaekwon Do ◽  
Eva-Maria Roller ◽  
Tao Zhang ◽  
Verena J. Schüller ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Metal Nanoparticles ◽  
Organic Dyes ◽  
Dna Origami ◽  
Hierarchical Assembly

scholarly journals Controllable modulation of precursor reactivity using chemical additives for systematic synthesis of high-quality quantum dots

2020 ◽  
Vol 11 (1) ◽  
Author(s):  
Joonhyuck Park ◽  
Arun Jayaraman ◽  
Alex W. Schrader ◽  
Gyu Weon Hwang ◽  
Hee-Sun Han
Keyword(s):  
Quantum Dots ◽  
Reaction Temperature ◽  
Structural Characteristics ◽  
Size Control ◽  
Precursor Chemistry ◽  
Structural Quality ◽  
Chemical Additives ◽  
High Quality ◽  
Surface Reaction Kinetics ◽  
Two Parameters

AbstractThe optical and electronic performance of quantum dots (QDs) are affected by their size distribution and structural quality. Although the synthetic strategies for size control are well established and widely applicable to various QD systems, the structural characteristics of QDs, such as morphology and crystallinity, are tuned mostly by trial and error in a material-specific manner. Here, we show that reaction temperature and precursor reactivity, the two parameters governing the surface-reaction kinetics during growth, govern the structural quality of QDs. For conventional precursors, their reactivity is determined by their chemical structure. Therefore, a variation of precursor reactivity requires the synthesis of different precursor molecules. As a result, existing precursor selections often have significant gaps in reactivity or require synthesis of precursor libraries comprising a large number of variants. We designed a sulfur precursor employing a boron-sulfur bond, which enables controllable modulation of their reactivity using commercially available Lewis bases. This precursor chemistry allows systematic optimization of the reaction temperature and precursor reactivity using a single precursor and grows high-quality QDs from cores of various sizes and materials. This work provides critical insights into the nanoparticle growth process and precursor designs, enabling the systematic preparation of high-quality QD of any sizes and materials.

Role of Anion–π Interactions in the Supramolecular Assembly of Salts Containing Asymmetrical Bis(pyridyl) Cations

2014 ◽  
Vol 67 (10) ◽  
pp. 1504
Author(s):  
Zhu-Yan Zhang ◽  
Zhao-Peng Deng ◽  
Li-Hua Huo ◽  
Shu-E Zhang ◽  
Hui Zhao ◽  
...  
Keyword(s):  
Hydrogen Bonds ◽  
Self Assembly ◽  
Supramolecular Assembly ◽  
Interpenetrating Networks ◽  
Π Interactions ◽  
Supramolecular Architectures ◽  
Left Handed ◽  
Inorganic Acids ◽  
Thermal Stability Of

Self-assembly of three flexible bis(pyridyl) molecules with different inorganic acids (HPF6, HClO4, and HNO3) leads to the formation of eight salts, which exhibit diverse architectures involving hydrogen bonding and anion–π interactions. The three types of inorganic anions in these salts formed anion–π interactions with HM+ and H2M2+ except for 2, in which the six F atoms were involved in hydrogen bonds. Anion–π interactions produced diverse motifs of one (anion)-to-one (cation) in 1, 3, 4, and 6, two (anion)-to-one (cation) in 5 and 7, and (4,4) layer in 8. Hydrogen bonds resulted in interesting supramolecular architectures, such as right- and left-handed helical chains in 3, 2-fold interpenetrating networks in 5, and 3-fold interpenetrating networks in 8. Structural analyses indicated that the conformations of the three flexible asymmetrical bis(pyridyl) molecules and the non-covalent bonding interactions, such as hydrogen bonds and anion···π interactions, play crucial roles in the final architectures of these salts. Thermogravimetric analyses indicated that the thermal stability of the eight salts decreased in the order of perchlorates, hexafluorophosphates, and nitrates. The emission intensity of the perchlorates is much stronger than that of the hexafluorophosphates, nitrates, and their corresponding organic molecules in the solid state at room temperature.

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