Crown ether 4 as a receptor core for protonated primary amines such as amino acids has been synthesized and incorporated into oligodeoxynucleotides as dangling ends.
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Anionic modulation induces molecular polarity in a three-component crown ether system.
Dalton Trans
January 2025
School of Chemistry and Chemical Engineering, Nanchang University, Nanchang, 330031, People's Republic of China.
Three-component crown ether phase change materials are characterized by a structural phase change in response to external stimuli such as temperature and electric or magnetic fields, resulting in significant changes in physical properties. In this work, we designed and synthesized two novel host-guest crown ether molecules [(PTFMA)(15-crown-5)ClO] (1) and [(PTFMA)(15-crown-5)PF] (2), through the reaction of -trifluoromethylaniline (PTFMA) with 15-crown-5 in perchloric acid or hexafluorophosphoric acid aqueous solution. Compound 1 undergoes a structural change from the non-centrosymmetric space group (2) to the centrosymmetric space group (2/) with increasing temperature.
View Article and Find Full Text PDFRing-in-Ring Assembly Facilitates the Synthesis of a [12]Cycloparaphenylene ABC-Type [3]Catenane.
Angew Chem Int Ed Engl
January 2025
Henan University, Colleg of Chemistry and Molecular Sciences, Jingmin, 475004, Kaifeng, CHINA.
Cycloparaphenylenes (CPPs) represent a significant challenge for the synthesis of mechanically interlocked architectures, because they lack heteroatoms, which precludes traditional active and passive template methods. To circumvent this problem and explore the fundamental and functional properties of CPP rotaxanes and catenanes, researches have resorted to unusual non-covalent and even to labor-intensive covalent template approaches. Herein, we report a ring-in-ring non-covalent template strategy that makes use of the surprisingly strong non-covalent inclusion of crown ethers into suitably sized CPPs.
View Article and Find Full Text PDFLithium complexing strategy based on host-guest recognition for efficient Mg/Li separation.
Water Res
January 2025
College of Environmental Science and Engineering, Donghua University, Shanghai 201620, China; Shanghai Institution Pollution Control & Ecology Security, Shanghai 200092, China. Electronic address:
Ion selective membranes with precise Mg/Li separation have attracted extensive interest in lithium extraction to circumvent the lithium supply shortage. However, realizing this target remains a significant challenge mainly due to a high concentration ratio of Mg/Li as well as the relatively close ionic hydration radius and chemical. Herein, inspired by the host-guest recognition between alkali-metal ions and crown ether (CE), a novel approach was proposed to regulate the membrane internal structure by introducing CE to strengthen the complexation between Li and CE.
View Article and Find Full Text PDFSilacrown ethers as ion transport modifiers and preliminary observations of cardiovascular cell line response.
J Inorg Biochem
December 2024
Rutgers, The State University of New Jersey, Dept of Pharmacology, Physiology & Neuroscience, Newark, NJ, United States of America.
Crown ethers have been shown to have physiological effects ascribed to their ionophoric properties. However, high levels of toxicity precluded interest in their evaluation as therapeutic agents. We prepared new silacrown analogs of crown ethers.
View Article and Find Full Text PDFIsolation of Inner-Sphere Aquo Complexes of Samarium(II).
J Am Chem Soc
January 2025
Department of Chemistry and Nuclear Science & Engineering Center, Colorado School of Mines, Golden, Colorado 80401, United States.
The and isomers of [Sm(dicyclohexano-18-crown-6)(HO)]I exhibiting water molecules bound to the Sm ion have been isolated and characterized. Sm possesses an electrochemical potential sufficient for water reduction, and thus these complexes add to the recent body of evidence that the oxidation of Sm by water can operate by a mechanism that is not straightforward. These complexes are obtained by the direct addition of stoichiometric amounts of water to solutions of the respective Sm(dicyclohexano-18-crown-6)I isomers under an inert atmosphere.
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