【摘 要】
：
Supramolecular polymer networks (SPNs) have always been the focus of research due to their novel features of good processability,stimuli-responsiveness,self-healing,and recyclability.Herein,we report the preparation of a metallacycle-linked supramolecular
【机 构】
：
College of Material,Chemistry and Chemical Engineering,Hangzhou Normal University,Hangzhou,Zhejiang
论文部分内容阅读
Supramolecular polymer networks (SPNs) have always been the focus of research due to their novel features of good processability,stimuli-responsiveness,self-healing,and recyclability.Herein,we report the preparation of a metallacycle-linked supramolecular gel via orthogonal metal-ligand interactions and host-guest interactions.A triangular metallacycle with three appended 21-crown-7(21C7) units was obtained by the metal coordination of nickel(Ⅱ)-salen-based dipyridyl ligands and platinum(Ⅱ) acceptors.The inte-gration of this metallacycle and traditional copolymer bearing secondary ammonium salts constructed a SPN via host-guest recogni-tion between 21C7 units and ammonium salts,and a supramolecular gel further formed at high concentration.Multiple stimulus re-sponsiveness and self-healing properties of gel were observed.The gel exhibited better stretchability compared to relative gel formed by copolymer alone owing to the synergistic effect of covalent bonds and supramolecular interactions.Moreover,compared to the model gel without metallacycles,the gel showed higher storage and loss moduli,and exhibited stronger stiffness in the self-healing tests performed with rheometer,indicating the metallacycle played an important role in improving the stiffness and self-healing of the gel.Therefore,the feasible approach to the formation of SPNs by the marriage of covalent polymers and metallacycles is ex-pected to open a new way to design novel SPNs.
其他文献
Amicetin and congeners constitute a small family of complex pyrimidine nucleosides,which exhibit strong antibiotic activities against Gram-positive bacteria and notably against strains of Mycobacterium tuberculosis.Herein,we report chemical synthesis of a
In this paper,two novel donor-acceptor (D-A) macrocyclic compounds 5 and 7 were successfully synthesized by post-functionalization of a planar dimer macrocycle (1) and a highly twisted trimer macrocycle (2),respectively,via controllable oxidation of metho
The efficient cleavage of carbon-oxygen (C-O) bond is highly important for the transformation of oxygen-rich biomass and industry chemicals.Herein,an efficient[3+3]annulation of β-ketoethers with cyclopropenones in the presence of catalytic base has been
Polymer-supramolecular double-network hydrogels (PS-DN hydrogels) often show much improved recovery rates than conventional double-network hydrogels because of the fast self-assembling properties,making them attractive candidates for tissue engineering an
Magnifying the controllable directional motions of molecular machines to the macroscopic levels is a significant topic for chemists.Flexible metal-organic frameworks with long-range order and responsive structural transformation under external stimuli may
An HPLC-UV-guided separation was performed and four pairs of unprecedented macathiohydantoin dimers,lepithiohydimerins A-D(1-4) bearing a rare disulfide bond were isolated from the tubers of Maca.Their structures were unambiguously confirmed by NMR spectr
In the present work,an artificial light-harvesting system with fluorescence resonance energy transfer (FRET) is successfully fabricated in aqueous sodium dodecyl sulfonate (SDS) micellar systems.Since the tight and orderly arrangement of dodecyl in the SD
Five novel pterocarpan derivatives (1-5) and three known pterocarpans were isolated from the roots of Sophoraflavescens Ait.Their structures were elucidated based on extensive spectroscopic data (UV,IR,1D and 2D NMR,and HR-ESI-MS).Notably,compounds 1-5 we
A pair of new enantiomeric compounds,(R)/(S)-1,3,5-benzene-triyl-2,2\',2\"-tris(4,5-dihydrothiazole-4-carboxylic acid) (H3LRRR and H3Lsss) are synthesized in one step synthetic route with high yield.Instant photochromism has been investigated to elabo
Three diamines (1,8-diaminooctane/p-phenylenediamine/biphenylenediamine) with different alkyl groups were used to synthesize the functionalized graphene networks.Pd as the common metal catalyst was used to explore the effects of alkyl types of diamines on