scholarly journals Controlling Molecular Aggregation-Induced Emission by Controlled Polymerization

Molecules ◽  
2021 ◽  
Vol 26 (20) ◽  
pp. 6267
Author(s):  
Yinyin Bao
Keyword(s):  
Small Molecules ◽  
Photophysical Properties ◽  
Systematic Investigation ◽  
Future Research ◽  
Structure Property ◽  
Controlled Polymerization ◽  
Polymeric Systems ◽  
Structure Property Relationships ◽  
Macromolecular Systems ◽  
Chain Lengths

In last twenty years, the significant development of AIE materials has been witnessed. A number of small molecules, polymers and composites with AIE activity have been synthesized, with some of these exhibiting great potential in optoelectronics and biomedical applications. Compared to AIE small molecules, macromolecular systems—especially well-defined AIE polymers—have been studied relatively less. Controlled polymerization methods provide the efficient synthesis of well-defined AIE polymers with varied monomers, tunable chain lengths and narrow dispersity. In particular, the preparation of single-fluorophore polymers through AIE molecule-initiated polymerization enables the systematic investigation of the structure–property relationships of AIE polymeric systems. Here, the main polymerization techniques involved in these polymers are summarized and the key parameters that affect their photophysical properties are analyzed. The author endeavored to collect meaningful information from the descriptions of AIE polymer systems in the literature, to find connections by comparing different representative examples, and hopes eventually to provide a set of general guidelines for AIE polymer design, along with personal perspectives on the direction of future research.

Structural modification strategies for the rational design of red/NIR region BODIPYs

2014 ◽  
Vol 43 (13) ◽  
pp. 4778-4823 ◽  
Author(s):  
Hua Lu ◽  
John Mack ◽  
Yongchao Yang ◽  
Zhen Shen
Keyword(s):  
Rational Design ◽  
Structural Modification ◽  
Photophysical Properties ◽  
Structure Property ◽  
Structure Property Relationships

The structure–property relationships of red/NIR region BODIPY dyes is analyzed, so that trends in their photophysical properties can be readily compared.

scholarly journals Barbituric Acid Based Fluorogens: Synthesis, Aggregation-Induced Emission, and Protein Fibril Detection

Molecules ◽  
2019 ◽  
Vol 25 (1) ◽  
pp. 32 ◽  
Author(s):  
Siyang Ding ◽  
Bicheng Yao ◽  
Louis Schobben ◽  
Yuning Hong
Keyword(s):  
Barbituric Acid ◽  
Fluorescent Dyes ◽  
Photophysical Properties ◽  
Wavelength Region ◽  
Structure Property ◽  
Aggregation Induced Emission ◽  
Long Wavelength ◽  
Structure Property Relationships ◽  
Potential Applications ◽  
Protein Fibril

Fluorescent dyes, especially those emitting in the long wavelength region, are excellent candidates in the area of bioassay and bioimaging. In this work, we report a series of simple organic fluorescent dyes consisting of electron-donating aniline groups and electron-withdrawing barbituric acid groups. These dyes are very easy to construct while emitting strongly in the red region in their solid state. The photophysical properties of these dyes, such as solvatochromism and aggregation-induced emission, are systematically characterized. Afterward, the structure–property relationships of these barbituric acid based fluorogens are discussed. Finally, we demonstrate their potential applications for protein amyloid fibril detection.

scholarly journals Combining Defects in a Single Nanographene: A Fully Helical Saddle Ribbon

Synlett ◽  
2019 ◽  
Vol 30 (09) ◽  
pp. 997-1002 ◽  
Author(s):  
Carlos Cruz ◽  
Silvia Castro-Fernández ◽  
Ermelinda Maçôas ◽  
Alba Millán ◽  
Araceli Campaña
Keyword(s):  
Organic Synthesis ◽  
Carbon Nanostructures ◽  
Nonlinear Optical ◽  
Photophysical Properties ◽  
Structure Property ◽  
Chiroptical Properties ◽  
Curved Structures ◽  
Structure Property Relationships ◽  
Linear And Nonlinear ◽  
Controlled Preparation

The controlled preparation of well-defined distorted nanographenes by a bottom-up approach based on organic synthesis permits the direct establishment of unprecedented structure–property relationships in carbon nanostructures. The simultaneous incorporation of various defects in nanographenes affords highly curved structures with novel or enhanced photophysical properties. In this sense, we recently reported a fully helical and saddle-shaped nanographene ribbon containing the first undecabenzo[7]helicene unit. Both its linear and nonlinear optical properties are enhanced in comparison with those of other partially π-extended [7]helicenes. Moreover, the new superhelicene exhibits the highest emission dissymmetry factor (g lum) reported to date for a homochiral nanographene. The combination of both nonlinear and chiroptical properties in nanographenes opens up new possible future applications for those distorted nanostructures.1 Introduction2 Synthesis of Embedded Seven-Membered Rings3 Combination of Defects: Seven-Membered Rings and π-Extended Helicenes4 Conclusions and Outlook

scholarly journals Synthesis and Characterization of Photoluminescence Liquid Crystals Based on Flexible Chain-Bearing Pentafluorinated Bistolanes

Crystals ◽  
2020 ◽  
Vol 10 (7) ◽  
pp. 603
Author(s):  
Shigeyuki Yamada ◽  
Masaya Sato ◽  
Tsutomu Konno
Keyword(s):  
Phase Transition ◽  
Liquid Crystals ◽  
Oxygen Atom ◽  
Liquid Crystalline ◽  
Color Change ◽  
Photophysical Properties ◽  
Structure Property ◽  
Flexible Chain ◽  
Structure Property Relationships ◽  
Chiral Nematic

The liquid-crystalline (LC) and photophysical properties of molecules are very sensitive to their electronic and molecular aggregate structures. Herein, to shed light on the structure–property relationships of pentafluorinated bistolane-based photoluminescence (PL) liquid crystals (PLLCs) previously reported by our group, we synthesized pentafluorinated bistolanes with variable flexible chains and evaluated their LC and photophysical properties. The incorporation of an oxygen atom (to afford a 2-methoxyethoxy unit) or an oxygen atom and a methyl group (to afford a 1-methoxyprop-2-oxy unit) into the flexible butoxy chain significantly decreased the temperature of the crystalline-to-LC phase transition, and a chiral nematic phase comprising helical molecular aggregates was observed for the chiral 1-methoxyprop-2-oxy group–bearing bistolane. The synthesized bistolanes exhibited strong blue PL in both solution and crystalline phases; the featuring PL characteristics were maintained in the LC phase (produced by the crystalline-to-LC phase transition) except for a slight PL color change. Thus, it was concluded that the PL behavior of pentafluorinated bistolanes can be modulated by the choice of a suitable flexible chain, and the obtained insights are believed to facilitate the application of PLLCs in thermosensing PL materials.

The Relations between Polymer Structure and Properties in Urethans

1960 ◽  
Vol 33 (5) ◽  
pp. 1259-1292 ◽  
Author(s):  
J. H. Saunders
Keyword(s):  
Polymer Structure ◽  
Future Research ◽  
Reliable Control ◽  
Structure And Properties ◽  
Structure Property ◽  
Structure Property Relationships ◽  
Precise Knowledge ◽  
Polymer Properties ◽  
Wide Range ◽  
The Many

Abstract Sufficient data are available from studies of urethan foams and elastomers to draw semiquantitative conclusions regarding the effect of any gross structural change on most polymer properties. These relationships apply to other areas of application as well, e.g., coatings, adhesives and sealants. Future research may be expected to provide more reliable control of the many reactions involved in preparing urethans, thus better control over structure. Similarly a more quantitative and extensive knowledge of polymer properties may be expected. The result of these combined efforts will be a more precise knowledge of structure-property relationships and an improved ability to produce polymers having the properties desired for a wide range of applications.

scholarly journals Progress on Exploring the Luminescent Properties of Organic Molecular Aggregates by Multiscale Modeling

2022 ◽  
Vol 9 ◽  
Author(s):  
Jingyi Zhao ◽  
Xiaoyan Zheng
Keyword(s):  
Multiscale Modeling ◽  
Photophysical Properties ◽  
Luminescent Properties ◽  
Molecular Aggregates ◽  
Structure Property ◽  
Structure Property Relationships ◽  
Intrinsic Mechanism ◽  
Potential Applications ◽  
Non Covalent Interactions ◽  
Covalent Interactions

Luminescent molecular aggregates have attracted worldwide attention because of their potential applications in many fields. The luminescent properties of organic aggregates are complicated and highly morphology-dependent, unraveling the intrinsic mechanism behind is urgent. This review summarizes recent works on investigating the structure–property relationships of organic molecular aggregates at different environments, including crystal, cocrystal, amorphous aggregate, and doped systems by multiscale modeling protocol. We aim to explore the influence of intermolecular non-covalent interactions on molecular packing and their photophysical properties and then pave the effective way to design, synthesize, and develop advanced organic luminescent materials.

Structure–property relationships in two-dimensionally extended benzoporphyrin molecules probed using single-molecule fluorescence spectroscopy

2016 ◽  
Vol 18 (10) ◽  
pp. 7521-7526 ◽  
Author(s):  
Sujin Ham ◽  
Sang Hyeon Lee ◽  
Heejae Chung ◽  
Dongho Kim
Keyword(s):  
Fluorescence Spectroscopy ◽  
Single Molecule ◽  
Condensed Phase ◽  
Photophysical Properties ◽  
Structure Property ◽  
Single Molecule Fluorescence ◽  
Structure Property Relationships ◽  
Single Molecule Fluorescence Spectroscopy ◽  
Different Shapes

The photophysical properties of a series of highly π-conjugated benzoporphyrin molecules (BPNs) with different shapes were investigated in the condensed phase using single-molecule fluorescence spectroscopy.

Summary

MRS Bulletin ◽  
1990 ◽  
Vol 15 (12) ◽  
pp. 44-46
Keyword(s):  
Phase Separation ◽  
Future Research ◽  
Initial Structure ◽  
Structure Property ◽  
Structure Property Relationships ◽  
Substantial Progress ◽  
Solvent Systems ◽  
Commercial Applications ◽  
Scientific Accomplishment ◽  
Made In

The development of LDMMs is a significant scientific accomplishment. This article provided an overview of the synthesis, structural characterization, and properties of these materials. Hopefully, the reader gained an appreciation for (1) the diverse morphologies of these materials, (2) their unique structure-property relationships, and (3) the difficulty in simultaneously achieving low densities with small cell sizes. This section will briefly discuss the future development of these materials and their potential commercial applications.Although substantial progress has been made in the scientific understanding of the formation of LDMMs, many important questions remain. As mentioned earlier, LDMMs rarely display an ideal spinodal morphology even though many of these structures have been established by phase-separation of polymer/solvent systems. Such morphologies appear to coarsen after the initial structure is established. The question arises — on what length scales is phase-separation taking place and how does its temporal evolution affect LDMM structure? In aerogel processing, polymerlike gels are formed, but certain sol-gels do not behave in accordance with theories on the swelling of conventional polymer gels. Why is this, and what is the effect on the final aerogel morphology? These and other questions can only be answered with a better understanding of gel structures and the dynamics of their formation. This is an important area for future research because the information gained can be used to tailor LDMMs for specific applications.

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