scholarly journals Paramagnetic spherical nanoparticles by the self-assembly of persistent trityl radicals

2016 ◽  
Vol 18 (4) ◽  
pp. 3151-3158 ◽  
Author(s):  
I. Marin-Montesinos ◽  
J. C. Paniagua ◽  
Alejandro Peman ◽  
M. Vilaseca ◽  
F. Luis ◽  
...  
Keyword(s):  
High Spin ◽  
Self Assembly ◽  
Spin Systems ◽  
Water Soluble ◽  
The Self ◽  
Spherical Nanoparticles ◽  
New Class ◽  
Self Association ◽  
Trityl Radical

The self-association of a water-soluble persistent trityl radical gives rise to paramagnetic nanoparticles: a new class of non-metallic high spin systems.

scholarly journals Insight into the Self-Assembly of Water-Soluble Perylene Bisimide Derivatives Through a Combined Computational and Experimental Approach

2019 ◽  
Author(s):  
Emily R. Draper ◽  
Liam Wilbraham ◽  
Dave J. Adams ◽  
Matthew Wallace ◽  
Martijn Zwijnenburg
Keyword(s):  
Density Functional Theory ◽  
Self Assembly ◽  
Density Functional ◽  
Colloidal Stability ◽  
Water Soluble ◽  
The Self ◽  
Functional Theory ◽  
Perylene Bisimide ◽  
Aggregate Growth ◽  
Perylene Bisimides

We use a combination of computational and experimental techniques to study the self-assembly and gelation of water-soluble perylene bisimides derivatised at the imide position with an amino acid. Specifically, we study the likely structure of self-assembled aggregates of the alanine-functionalised perylene bisimide (PBI-A) and the thermodynamics of their formation using density functional theory and predict the UV-vis spectra of such aggregates using time-dependent density functional theory. We compare these predictions to experiments in which we study the evolution of the UV-Vis and NMR spectra and rheology of alkaline PBI-A solutions when gradually decreasing the pH. Based on the combined computational and experimental results, we show that PBI-A self-assembles at all pH values but that aggregates grow in size upon protonation. Gelation is driven not by aggregate growth but reduction of the aggregation surface-charge and a decrease in the colloidal stability of the aggregation with respect to agglomeration.

scholarly journals Insight into the self-assembly of water-soluble perylene bisimide derivatives through a combined computational and experimental approach

Nanoscale ◽  
2019 ◽  
Vol 11 (34) ◽  
pp. 15917-15928 ◽  
Author(s):  
Emily R. Draper ◽  
Liam Wilbraham ◽  
Dave J. Adams ◽  
Matthew Wallace ◽  
Ralf Schweins ◽  
...  
Keyword(s):  
Amino Acid ◽  
Self Assembly ◽  
Experimental Approach ◽  
Water Soluble ◽  
The Self ◽  
Experimental Techniques ◽  
Perylene Bisimide ◽  
Perylene Bisimides ◽  
Insight Into

We use a combination of computational and experimental techniques to study the self-assembly and gelation of amino-acid functionalised water-soluble perylene bisimides.

Nanoparticles as template for porphyrin nanostructure growth

2019 ◽  
Vol 23 (04n05) ◽  
pp. 526-533 ◽  
Author(s):  
Mariana Hamer ◽  
Rolando M. Caraballo ◽  
Peter J. Eaton ◽  
Craig Medforth
Keyword(s):  
Self Assembly ◽  
Soret Band ◽  
Surface Interactions ◽  
Water Soluble ◽  
The Self ◽  
Stacking Interactions ◽  
Aromatic System ◽  
One Pot ◽  
Assembly Mechanism ◽  
Scattering Measurements

Porphyrins and metalloporphyrins are one of the most widely studied platforms for the construction of supramolecular structures. These compounds have an extended aromatic system that allows [Formula: see text]–[Formula: see text] stacking interactions which, together with hydrogen bonds, electrostatic forces and the formation of inter-metallic complexes arising from peripheral groups, offer a versatile platform to control the self-assembly mechanism. In this work, we present the study of nanostructures formed by self-assembly of the water-soluble porphyrins meso-tetra([Formula: see text]-methyl-4-pyridyl)porphyrin (TMPyP) and meso-tetra(4-sulfonatophenyl)porphyrin (TPPS) in the presence of hard nanotemplates. Different nanoparticles (silica, gold, and polystyrene), concentrations and synthetic procedures were explored. The obtained materials were characterized by SEM and AFM microscopies, UV-vis absorption spectroscopy and dynamic light scattering measurements. A clear modification of the SiO2 NP surface roughness using one-pot synthesis was observed. The results were variable depending on the porphyrin–surface interactions and concentrations used. At lower porphyrin concentrations, a shift of the Soret band was observed, while at higher concentrations, free NS were formed. This reflects a competition between surface and solution directed self-assembly.

Case history of porphyrin J-aggregates: a personal point of view

2009 ◽  
Vol 13 (04n05) ◽  
pp. 461-470 ◽  
Author(s):  
Joaquim Crusats ◽  
Zoubir El-Hachemi ◽  
Carlos Escudero ◽  
Josep M. Ribó
Keyword(s):  
Supramolecular Chemistry ◽  
Self Assembly ◽  
Building Blocks ◽  
Point Of View ◽  
Water Soluble ◽  
The Self ◽  
Molecular Building Blocks ◽  
History Of ◽  
J Aggregates ◽  
The University

The formation and structure of the title aggregates are paradigms of the self-assembly of amphiphilic molecular building blocks in supramolecular chemistry. This review summarizes the research in the University of Barcelona on the homoassociation of the water soluble meso 4-sulfonatophenyl-and phenyl substituted porphyrins.

Factors driving the self-assembly of water-soluble calix[4]arene and gemini guests: a combined solution, computational and solid-state study

RSC Advances ◽  
2014 ◽  
Vol 4 (96) ◽  
pp. 53575-53587 ◽  
Author(s):  
Carmela Bonaccorso ◽  
Giovanna Brancatelli ◽  
Giuseppe Forte ◽  
Giuseppe Arena ◽  
Silvano Geremia ◽  
...  
Keyword(s):  
Solid State ◽  
Self Assembly ◽  
Water Soluble ◽  
The Self ◽  
State Study ◽  
Combined Solution

scholarly journals Insight into the Self-Assembly of Water-Soluble Perylene Bisimide Derivatives Through a Combined Computational and Experimental Approach

2019 ◽  
Author(s):  
Emily R. Draper ◽  
Liam Wilbraham ◽  
Dave J. Adams ◽  
Matthew Wallace ◽  
Martijn Zwijnenburg
Keyword(s):  
Density Functional Theory ◽  
Self Assembly ◽  
Density Functional ◽  
Colloidal Stability ◽  
Water Soluble ◽  
The Self ◽  
Functional Theory ◽  
Perylene Bisimide ◽  
Aggregate Growth ◽  
Perylene Bisimides

We use a combination of computational and experimental techniques to study the self-assembly and gelation of water-soluble perylene bisimides derivatised at the imide position with an amino acid. Specifically, we study the likely structure of self-assembled aggregates of the alanine-functionalised perylene bisimide (PBI-A) and the thermodynamics of their formation using density functional theory and predict the UV-vis spectra of such aggregates using time-dependent density functional theory. We compare these predictions to experiments in which we study the evolution of the UV-Vis and NMR spectra and rheology of alkaline PBI-A solutions when gradually decreasing the pH. Based on the combined computational and experimental results, we show that PBI-A self-assembles at all pH values but that aggregates grow in size upon protonation. Gelation is driven not by aggregate growth but reduction of the aggregation surface-charge and a decrease in the colloidal stability of the aggregation with respect to agglomeration.

scholarly journals Self-assembly of an Organometallic Fe9O6 Cluster from Aerobic Oxidation of (tmeda)Fe(CH2tBu)2

2019 ◽  
Author(s):  
Jonathan Kephart ◽  
Zachary Hecht ◽  
Brooke N. Livesay ◽  
Matthew P. Shores ◽  
V. Codrina Popescu ◽  
...  
Keyword(s):  
Solid State ◽  
High Spin ◽  
Self Assembly ◽  
Organometallic Compound ◽  
Aerobic Oxidation ◽  
The Self ◽  
Ferrous Oxide ◽  
Antiferromagnetic Coupling ◽  
Oxide Cluster ◽  
Diamine Ligands

<div><div><div><p>Substoichiometric aerobic oxidation of the high-spin organometallic compound (tmeda)Fe(CH2tBu)2 (tmeda = N,N,N’,N’- tetramethylethylenediamine) in toluene or THF solution leads to the self-assembly of a magic-sized all-ferrous oxide cluster containing the Fe9O6 subunit and bearing organometallic and diamine ligands. Mössbauer studies of the cluster and the reference complex (tmeda)Fe(OCPh3)2 are consistent with the all-ferrous assignment, and magnetometry reveal considerable antiferromagnetic coupling between Fe atoms in the cluster and frustrated antiferromagnetic interactions between clusters in the solid state.</p></div></div></div>

Tuning Morphology and Fluorescence of Aggregated Nanostructures of Derived Perylene Diimide Molecules

2008 ◽  
Vol 8 (4) ◽  
pp. 2005-2010
Author(s):  
Xiaorong He ◽  
Weidong Zhou ◽  
Yuliang Li ◽  
Xiaofeng Liu ◽  
Cuihong Li ◽  
...  
Keyword(s):  
Optical Properties ◽  
Self Assembly ◽  
Water Soluble ◽  
The Self ◽  
Perylene Diimide ◽  
Confocal Raman Microscopy ◽  
Sem Images ◽  
Confocal Raman ◽  
Chloride Salts ◽  
Scanning Electron

In this paper, we report on the self-assembly of water-soluble N,N′-di(N,N′-dimethyl-dodecane-1,12-diamide)-perylene-3,4,9,10-tetracarboxylic diimide (PDDoAM) in formic acid and chloride salts for producing varied nano-aggregates with different optical properties. Interestingly, the self-assembly can lead to nanocubic, microsheet and “tower-like” nanostructures respectively, as demonstrated by Scanning Electron Microscopy (SEM) images. The optical properties of molecular aggregates were investigated by means of Confocal Raman Microscopy, indicating the morphologies and fluorescence of these nanomaterials are dependent on acids, acid concentrations and casting methods.

scholarly journals Solution effects on the self‐association of a water‐soluble peptoid

Biopolymers ◽  
2018 ◽  
Vol 110 (4) ◽  
pp. e23248 ◽  
Author(s):  
Amelia A. Fuller ◽  
Jonathan Huber ◽  
Christian J. Jimenez ◽  
Kalli M. Dowell ◽  
Samuel Hough ◽  
...  
Keyword(s):  
Water Soluble ◽  
The Self ◽  
Self Association

Reversible Vesicle-to-Disk Transitions of Liposomes Induced by the Self-Assembly of Water-Soluble Porphyrins

Langmuir ◽  
2017 ◽  
Vol 33 (4) ◽  
pp. 1023-1029 ◽  
Author(s):  
Kouta Sugikawa ◽  
Yutaro Takamatsu ◽  
Kazuma Yasuhara ◽  
Masafumi Ueda ◽  
Atsushi Ikeda
Keyword(s):  
Self Assembly ◽  
Water Soluble ◽  
The Self
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