Visual self-assembly and stimuli-responsive materials based on recent phosphorescent platinum(ii) complexes

2020 ◽  
Vol 5 (10) ◽  
pp. 1578-1605
Author(s):  
Baoning Li ◽  
Zhenjie Liang ◽  
Huijie Yan ◽  
Yongguang Li
Keyword(s):  
Chemical Sensors ◽  
Self Assembly ◽  
Luminescent Properties ◽  
Optical Devices ◽  
Luminescent Materials ◽  
Stimuli Responsive ◽  
Promising Candidate ◽  
Responsive Materials ◽  
Bio Imaging

Organoplatinum(ii) complexes with various π-conjugated ligands exhibit intriguing luminescent properties and they are a promising candidate to construct smart luminescent materials in optical devices, chemical sensors, and bio-imaging.

scholarly journals pH- and concentration-dependent supramolecular self-assembly of a naturally occurring octapeptide

2020 ◽  
Vol 16 ◽  
pp. 2017-2025
Author(s):  
Goutam Ghosh ◽  
Gustavo Fernández
Keyword(s):  
Self Assembly ◽  
Ph Value ◽  
Secondary Structures ◽  
Random Coil ◽  
Conformational Transformation ◽  
Stimuli Responsive ◽  
Responsive Materials ◽  
Force Microscopy ◽  
Assembly Behavior ◽  
Novel Drug

Peptide-based biopolymers represent highly promising biocompatible materials with multiple applications, such as tailored drug delivery, tissue engineering and regeneration, and as stimuli-responsive materials. Herein, we report the pH- and concentration-dependent self-assembly and conformational transformation of the newly synthesized octapeptide PEP-1. At pH 7.4, PEP-1 forms β-sheet-rich secondary structures into fractal-like morphologies, as verified by circular dichroism (CD), Fourier-transform infrared (FTIR) spectroscopy, thioflavin T (ThT) fluorescence spectroscopy assay, and atomic force microscopy (AFM). Upon changing the pH value (using pH 5.5 and 13.0), PEP-1 forms different types of secondary structures and resulting morphologies due to electrostatic repulsion between charged amino acids. PEP-1 can also form helical or random-coil secondary structures at a relatively low concentration. The obtained pH-sensitive self-assembly behavior of the target octapeptide is expected to contribute to the development of novel drug nanocarrier assemblies.

Synthesis and self-assembly of photoacid-containing block copolymers based on 1-naphthol

2019 ◽  
Vol 10 (41) ◽  
pp. 5602-5616 ◽  
Author(s):  
Felix Wendler ◽  
Jessica C. Tom ◽  
Felix H. Schacher
Keyword(s):  
Block Copolymers ◽  
Self Assembly ◽  
Molecular Switches ◽  
Amphiphilic Block Copolymers ◽  
Strong Increase ◽  
Stimuli Responsive ◽  
Responsive Materials

Photoacids experience a strong increase in acidity when absorbing light and, hence, can be considered as molecular switches. The incorporation into amphiphilic block copolymers leads to novel stimuli-responsive materials with great potential.

Facile and fast photosensing of polarity by stimuli-responsive materials based on spiropyran for reusable sensors: a physico-chemical study on the interactions

2017 ◽  
Vol 5 (26) ◽  
pp. 6588-6600 ◽  
Author(s):  
Amin Abdollahi ◽  
Zeinab Alinejad ◽  
Ali Reza Mahdavian
Keyword(s):  
Data Storage ◽  
Chemical Sensors ◽  
Optical Switching ◽  
Chemical Study ◽  
Optical Data Storage ◽  
Optical Data ◽  
Stimuli Responsive ◽  
Responsive Materials ◽  
Storage Devices ◽  
Physico Chemical

Stimuli-responsive materials based on spiropyran, which show reversible solvatochromism and photochromism under UV irradiation, could be used for advanced devices such as chemical sensors, optical data storage devices, and optical switching displays.

scholarly journals Carbocycle-Based Organogelators: Influence of Chirality and Structural Features on Their Supramolecular Arrangements and Properties

Gels ◽  
2021 ◽  
Vol 7 (2) ◽  
pp. 54
Author(s):  
Rosa M. Ortuño
Keyword(s):  
Smart Materials ◽  
Self Assembly ◽  
Rational Design ◽  
Structural Features ◽  
Stimuli Responsive ◽  
Polycyclic Compounds ◽  
Relative Configuration ◽  
Responsive Materials ◽  
Self Assembling ◽  
Donor Acceptor

The rational design and engineer of organogel-based smart materials and stimuli-responsive materials with tuned properties requires the control of the non-covalent forces driving the hierarchical self-assembly. Chirality, as well as cis/trans relative configuration, also plays a crucial role promoting the morphology and characteristics of the aggregates. Cycloalkane derivatives can provide chiral chemical platforms allowing the incorporation of functional groups and hydrophobic structural units able for a convenient molecular stacking leading to gels. Restriction of the conformational freedom imposed by the ring strain is also a contributing issue that can be modulated by the inclusion of flexible segments. In addition, donor/acceptor moieties can also be incorporated favoring the interactions with light or with charged species. This review offers a perspective on the abilities and properties of carbocycle-based organogelators starting from simple cycloalkane derivatives, which were the key to establish the basis for an effective self-assembling, to sophisticated polycyclic compounds with manifold properties and applications.

Luminescent properties of Eu3+-doped SmBa3B9O18

2013 ◽  
Vol 28 (S1) ◽  
pp. S41-S44 ◽  
Author(s):  
Ming He ◽  
Z.H. Zhang ◽  
Y.Z. Zhu ◽  
Y.G. Tang ◽  
Z. Song
Keyword(s):  
Luminescent Properties ◽  
Optical Devices ◽  
Concentration Quenching ◽  
Solid State Reactions ◽  
Luminescent Materials ◽  
Photoluminescence Spectra ◽  
Photoluminescence Properties ◽  
X Ray Diffraction ◽  
X Ray ◽  
Scanning Electron

Eu3+-doped SmBa3B9O18 luminescent materials were synthesized by high temperature solid state reactions. The structure and photoluminescence properties of Sm(1−x)EuxBa3B9O18 (x = 0.2, 0.4, and 0.6) were investigated by X-ray diffraction, scanning electron microscopy, energy dispersive X-ray spectroscopy, and photoluminescence spectra. The results show that doping of Eu3+ ions does not change the structure of SmBa3B9O18. The luminescence is mainly the characteristic Eu3+ ion luminescence. No concentration quenching processes occur with the increment of Eu3+ concentration. The work implies that SmBa3B9O18 is a potential host material and europium-doped SmBa3B9O18 may find application in display and optical devices.

scholarly journals Anthracene-induced formation of highly twisted metallacycle and its crystal structure and tunable assembly behaviors

2021 ◽  
Vol 118 (27) ◽  
pp. e2102602118
Author(s):  
Chongyi Chen ◽  
Yan Sun ◽  
Yue Zhao ◽  
Ryan T. VanderLinden ◽  
Wei Tuo ◽  
...  
Keyword(s):  
Self Assembly ◽  
Luminescent Materials ◽  
Ordered Structure ◽  
X Ray Diffraction ◽  
Promising Candidate ◽  
X Ray ◽  
Metal Organic Complex ◽  
Polycyclic Aromatic ◽  
Metal Organic ◽  
Selective Integration

Polycyclic aromatic hydrocarbons (PAHs) continue to attract increasing interest with respect to their applications as luminescent materials. The ordered structure of the metal−organic complex facilitates the selective integration of PAHs that can be tuned to function cooperatively. Here, a unique highly twisted anthracene-based organoplatinum metallacycle was prepared via coordination-driven self-assembly. Single-crystal X-ray diffraction analysis revealed that the metallacycle was twisted through the cooperation of strong π···π stacking interactions and steric hindrance between two anthracene-based ligands. Notably, the intramolecular twist and aggregation behavior introduced restrictions to the conformational change of anthracenes, which resulted in increased emission intensity of the metallacycle in solution. The emission behaviors and suprastructures based on the highly twisted metallacycle can be modulated by the introduction of different solvents. This study demonstrates that this metallacycle with highly twisted structure is a promising candidate for sensing and bioimaging applications.

CO2-responsive polymeric materials: synthesis, self-assembly, and functional applications

2016 ◽  
Vol 45 (15) ◽  
pp. 4391-4436 ◽  
Author(s):  
Ali Darabi ◽  
Philip G. Jessop ◽  
Michael F. Cunningham
Keyword(s):  
Self Assembly ◽  
Polymeric Materials ◽  
Stimuli Responsive ◽  
Materials Synthesis ◽  
Responsive Materials ◽  
Functional Applications ◽  
System P

CO2is an ideal trigger for switchable or stimuli-responsive materials because it is benign, inexpensive, green, abundant, and does not accumulate in the system.

Cyclic aminomethylphosphines as ligands. Rational design and unpredicted findings

2017 ◽  
Vol 89 (3) ◽  
pp. 293-309 ◽  
Author(s):  
Andrey A. Karasik ◽  
Elvira I. Musina ◽  
Anna S. Balueva ◽  
Igor D. Strelnik ◽  
Oleg G. Sinyashin
Keyword(s):  
Transition Metal Complexes ◽  
Rational Design ◽  
Luminescent Properties ◽  
Luminescent Materials ◽  
Chelating Ligands ◽  
Stimuli Responsive ◽  
Transitional Metals ◽  
Spontaneous Formation ◽  
Macrocyclic Molecules ◽  
High Influence

Abstract:Rational design of title ligands and their transition metal complexes gave the high effective catalysts for hydrogen economy and perspective “stimuli-responsive” luminescent materials. Together with the above novel cyclic aminomehtylphospine ligands have showed a row of unpredicted properties like spontaneous formation of macrocyclic molecules, unique reversible slitting of macrocycles on to the smaller cycles, rapid interconversion of the isomers catalyzed by both acids and transitional metals, bridging behavior of usually chelating ligands and unexpected high influence of handling substituents on N-atoms on to the catalytic and luminescent properties of P-complexes.

scholarly journals A Stimuli-Responsive Pillar[5]arene-Based Hybrid Material with Enhanced Tunable Multicolor Luminescence and Ion Sensing Ability

2020 ◽  
Author(s):  
Xin-Yue Lou ◽  
Nan Song ◽  
Ying-Wei Yang
Keyword(s):  
Hybrid Material ◽  
Luminescent Properties ◽  
Building Blocks ◽  
Luminescent Materials ◽  
Stimuli Responsive ◽  
Fluorescent Properties ◽  
Ion Sensing ◽  
Efficient Charge ◽  
Application Potential ◽  
External Stimuli

Abstract Tunable luminescent materials are becoming more and more important owing to their broad application potential in various fields. Here we construct a pillar[5]arene-based hybrid material with stimuli-responsive luminescent properties and ion sensing abilities from a pyridine-modified conjugated pillar[5]arene and a planar chromophore oligo(phenylenevinylene) upon coordination of Cd (II) metal cores. This new material not only shows an optimized luminescence due to the minimized π-π stacking and efficient charge transfer (CT) properties benefitting from the existence of pillar[5]arene rings, but also exhibits tunable multicolor emission induced by different external stimuli including solvent, ions, and acid, indicating great application potential as a fluorescent sensory material especially for Fe3+. With this pillar[5]arene-based dual-ligand hybrid material, valid optimization and regulation on the fluorescence of the original chromophore have been achieved, which demonstrates a plausible strategy for the design of tunable solid-state luminescent materials and also a prototypical model for the effective regulation of fluorescent properties of planar π systems using synthetic macrocycles-based building blocks.

Synthesis, self-assembly, and degradation of amphiphilic triblock copolymers with fully photodegradable hydrophobic blocks

2015 ◽  
Vol 93 (1) ◽  
pp. 126-133 ◽  
Author(s):  
J. Trevor McIntosh ◽  
Ali Nazemi ◽  
Colin V. Bonduelle ◽  
Sebastien Lecommandoux ◽  
Elizabeth R. Gillies
Keyword(s):  
Electron Microscopy ◽  
Light Scattering ◽  
Self Assembly ◽  
Uv Light ◽  
Triblock Copolymers ◽  
Weight Fraction ◽  
Stimuli Responsive ◽  
Responsive Materials ◽  
Poly Ethylene ◽  
Imaging Sensors

The development of stimuli-responsive materials is of significant interest for many applications including drug delivery, medical imaging, sensors, and microfluidic devices. Among the available stimuli, light is particularly attractive as it can be applied with high spatial and temporal resolution. We describe here the synthesis of amphiphilic triblock copolymers composed of poly(ethylene glycol) and a hydrophobic block containing o-nitrobenzyl esters throughout the backbone using copper-catalyzed azide–alkyne cycloaddition chemistry. These materials were designed to have a high weight fraction of the hydrophobic block to favour nonmicellar aggregates. The self-assembly in water was studied using nanoprecipitation and the resulting assemblies were characterized by dynamic light scattering and transmission electron microscopy. Under optimized conditions, it was possible to prepare polymer vesicles, commonly referred to as polymersomes, with diameters of approximately 100 nm. The degradation of these materials in response to UV light was studied by spectroscopy, light scattering, and electron microscopy, demonstrating that the vesicles were broken down. These results suggest the potential of these materials for applications such as encapsulation and release.

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