Pyrene aggregates, as classic luminescent materials, are of great interest from a scientific viewpoint owing to the development of optoelectronic materials. In this study, we designed a compound 1,4,5-triphenyl-2-(pyren-1-yl)-4,5-dihydro-1H-imidazole (IM-PY) which was achieved with two crystalline polymorphs (IMPY-G and IMPY-B). They exhibit the green emission and the blue emission, respectively, both with pyrene serving as the luminescent core. At ambient conditions, both phases exhibit π-π pyrene dimer stacking, but IMPY-B has the obviously smaller overlapping area and slightly shorter distance of pyrene planes than IMPY-G. During compression, the experiment results of photoluminescence, in situ UV-vis absorption, time-resolved emission, and synchrotron angular dispersive X-ray diffraction, combined with theoretical calculations indicate that IMPY-B shows a more pronounced red-shifted photoluminescence spectra and forms excimers at higher pressure than IMPY-G. This fully reflects the influence of different stacking structures on the piezochromic phenomenon of aggregates, which is beneficial for expanding the application of pyrene aggregated state.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1002/chem.202404608 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Photo-Controllable Förster Resonance Energy Transfer Based on Dynamic Chiral Self-Assembly of Sequence-Defined Amphiphilic Alternating Azopeptoids.
Small
January 2025
Shanghai Key Laboratory of Advanced Polymeric Materials, Frontiers Science Center for Materiobiology and Dynamic Chemistry, School of Materials Science and Engineering, East China University of Science and Technology, Shanghai, 200237, China.
Endowing biomimetic sequence-controlled polymers with chiral functionality to construct stimuli-responsive chiral materials offers a promising approach for innovative chiroptical switch, but it remains challenging. Herein, it is reported that the self-assembly of sequence-defined chiral amphiphilic alternating azopeptoids to generate photo-responsive and ultrathin bilayer peptoidosomes with a vesicular thickness of ≈1.50 nm and a diameter of around ≈290 nm.
View Article and Find Full Text PDFBiocompatible 2D Material Inks Enabled by Supramolecular Chemistry: From Synthesis to Applications.
Acc Chem Res
January 2025
Department of Chemistry, The University of Manchester, Manchester M13 9PL, United Kingdom.
ConspectusThe emergence of two-dimensional (2D) materials, such as graphene, transition-metal dichalcogenides (TMDs), and hexagonal boron nitride (h-BN), has sparked significant interest due to their unique physicochemical, optical, electrical, and mechanical properties. Furthermore, their atomically thin nature enables mechanical flexibility, high sensitivity, and simple integration onto flexible substrates, such as paper and plastic.The surface chemistry of a nanomaterial determines many of its properties, such as its chemical and catalytic activity.
View Article and Find Full Text PDFPiezochromic Luminescence of Pyrene Derivatives Polymorphism around Excimer Forming Processs.
Chemistry
January 2025
Northeastern University, Department of Materials Physics and Chemistry, No.11, Wenhua Road, Lane 3,Heping District, 110819, Shenyang, CHINA.
Pyrene aggregates, as classic luminescent materials, are of great interest from a scientific viewpoint owing to the development of optoelectronic materials. In this study, we designed a compound 1,4,5-triphenyl-2-(pyren-1-yl)-4,5-dihydro-1H-imidazole (IM-PY) which was achieved with two crystalline polymorphs (IMPY-G and IMPY-B). They exhibit the green emission and the blue emission, respectively, both with pyrene serving as the luminescent core.
View Article and Find Full Text PDFProbing Macromolecular Conformation in Restricted Geometry by PEF: Application to Hydrophobically Modified PAMAM Dendrimers Isolated Inside Surfactant Micelles.
J Phys Chem B
January 2025
Institute for Polymer Research, Waterloo Institute for Nanotechnology, Department of Chemistry, University of Waterloo, Waterloo, Ontario N2L 3G1, Canada.
The conformation of a series of zero-generation polyamidoamine dendrimers end-labeled with four 1-pyrene-butyroyl, -hexanoyl, -octanoyl, -decanoyl, and -dodecanoyl derivatives, referred to as the PyCX-PAMAM-G0 samples with = 4, 6, 8, 10, and 12, respectively, was characterized in ,-dimethylformamide (DMF), dimethyl sulfoxide (DMSO), and aqueous solutions of 50 mM sodium dodecyl sulfate (SDS) or 50 mM dodecyltrimethylammonium bromide (DTAB). The conformation of the PyCX-PAMAM-G0 samples was determined from the global model-free analysis (MFA) of the fluorescence decays, which yielded the average rate constant (⟨⟩) for pyrene excimer formation (PEF) between an excited and a ground-state pyrenyl labels, with ⟨⟩ being proportional to the local concentration ([Py]) of the pyrenyl labels within the macromolecular volume; ⟨⟩-vs-[Py] plots yielded straight lines passing through the origin in DMF and DMSO, demonstrating that the internal segments of the dendrimers obeyed Gaussian statistics in these two solvents. In aqueous surfactant solutions, the hydrophobic pyrenyl labels induced the interactions of the PyCX-PAMAM-G0 dendrimers with the SDS and DTAB micelles.
View Article and Find Full Text PDFRoom-Temperature Reversible Control of Fluorescently Distinct Polymorphs Using Pressure and E-Field: Writing and Erasing Information without Thermal Treatment.
J Am Chem Soc
January 2025
Department of Chemistry, Dankook University, 119, Dandae-ro, Chungnam 448-701, Korea.
This paper presents the reversible transformation between two polymorphs of a hexacatenar liquid crystal () with distinct fluorescence colors at room temperature (RT). This method utilizes mechanical pressure (mechanochromism) and an electric field (E-field-chromism). The molecule (), designed with a pyrene core and 1,2,3-triazole linkers, exhibits a blue-emissive crystalline (CRY) polymorph () and a green-emissive liquid crystalline (LC) polymorph () at RT, depending on the cooling rate from the liquid phase.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!