Compound [Ag S (StBu) (CF COO) (CO )](CO ) ⋅CH Cl ⋅4CH OH⋅9DMF (1) has been obtained and well defined. It consists of a multi-shell structure involving two Ag centres, one Ag S pentagram, two Ag S pentagons and one Ag S shell. Compound 1 has been characterized by XPS, FT-IR, PXRD, TGA, NMR, MS, UV/Vis spectrum, TEM and cyclic voltammetry. Temperature-sensitive luminescent property of 1 has also been investigated.
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http://dx.doi.org/10.1002/asia.201901146 | DOI Listing |
ACS Biomater Sci Eng
November 2024
National Engineering Laboratory for Advanced Yarn and Fabric Formation and Clean Production, Technology Institute, Wuhan Textile University, Wuhan, Hubei 430200, China.
Developing aggregation-induced emission (AIE)-based hydrogels that exhibit fluorescence enhancement as to thermal properties is an interesting and challenging task. In this work, we employed the fluorophore 2'-hydroxychalcone (HC), fluorescence properties of which are easily influenced by the excited-state intramolecular proton transfer and twisted intramolecular charge transfer (TICT) effects, to develop a novel type of temperature-sensitive polymers, hydroxychalcone-based polymers (HCPs). By controlling the temperature-dependent water microenvironments in HCPs, the intramolecular hydrogen bonds between water and HCPs can be regulated, thereby influencing the TICT process and leading to thermo-induced fluorescence enhancement, which shows a contrary tendency compared to typical AIEgens that always exhibit fluorescence attenuation as the thermal energy accelerates the molecular motion.
View Article and Find Full Text PDFACS Appl Mater Interfaces
October 2024
The Hong Kong Polytechnic University Shenzhen Research Institute, Shenzhen 518000, China.
As the landscape of information storage and security continues to evolve, the deployment of sophisticated anticounterfeiting strategies with robust security features and multimodal luminescent capabilities becomes imperative. In this work, Eu and Er ions are codoped into CaF phosphors to achieve multimodel optical output. The self-reduction of Eu within the CaF matrix gives rise to the coexistence of Eu and Eu ions, which manifests as a color transition from orange to blue as the excitation wavelength is varied from 300 to 335 nm.
View Article and Find Full Text PDFJ Fluoresc
October 2024
Institute of Chemistry, Far Eastern Branch of the Russian Academy of Sciences, Prosp. 100 Letiya Vladivostoka, 159, Vladivostok, Russian Federation.
ACS Appl Mater Interfaces
September 2024
School of Mechanical Engineering, Institute for Advanced Materials, Deformation and Damage from Multi-Scale, Chengdu University, Chengdu 610106, China.
Cryogenic detection technology is essential to ensure safety and effectiveness in fields such as medical refrigeration, cold chain transport, and cryogenic bioengineering. In this paper, a time-responsive visual cryogenic detection strategy is developed based on the storage properties of CaZnOS: Pb, Pr phosphors with shallow traps. Since the carrier release rate from the trap center receives the influence of ambient temperature and storage time, the storage time of the temperature-sensitive product can be determined by the different optical signals of CaZnOS: Pb, Pr phosphors obtained under 980 nm laser irradiation.
View Article and Find Full Text PDFChem Asian J
December 2024
Department of Materials Science, Graduate School of Engineering, The University of Shiga Prefecture, 2500 Hassaka-cho, Hikone, Shiga, 522-8533, Japan.
Three thienopyrrole-fused thiadiazole (TPT) fluorescent dyes featuring a common amide linker and different alkoxy substituents on peripheral trialkoxybenzene moieties were synthesized, and their self-assembly behavior in solution was investigated. The obtained results revealed a substantial steric effect of the alkoxy substituents on the supramolecular polymerization mechanism, which results from a combination of π-stacking and hydrogen (H)-bonding interactions. Detailed spectroscopic measurements revealed that with increasing steric demand of the substituents, the supramolecular polymerization processes in pure methylcyclohexane (MCH) or a mixture of MCH and toluene become temperature-sensitive and enthalpically favorable, resulting in a change from the isodesmic assembly mechanism to the cooperative mechanism.
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