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Zheng H, Tong X, Zhang Y, Yin P, Yi J, Chen Z, Lai H, Zhou W, Zhong L, Zhuo H, Peng X. Controllable and Reversible Assembly of Nanofiber from Natural Macromolecules via Protonation and Deprotonation. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2024; 20:e2304196. [PMID: 37665232 DOI: 10.1002/smll.202304196] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/19/2023] [Revised: 07/18/2023] [Indexed: 09/05/2023]
Abstract
Nanofiber is the critical building block for many biological systems to perform various functions. Artificial assembly of molecules into nanofibers in a controllable and reversible manner will create "smart" functions to mimic those of their natural analogues and fabricate new functional materials, but remains an open challenge especially for nature macromolecules. Herein, the controllable and reversible assembly of nanofiber (CSNF) from natural macromolecules with oppositely charged groups are successfully realized by protonation and deprotonation of charged groups. By controlling the electrostatic interaction via protonation and deprotonation, the size and morphology of the assembled nanostructures can be precisely controlled. A strong electrostatic interaction contributes to large nanofiber with high strength, while poor electrostatic interaction produces finer nanofiber or nanoparticle. And especially, the assembly, disassembly, and reassembly of the nanofiber occurs reversibly through protonation and deprotonation, thereby paving a new way for precisely controlling the assembly process and structure of nanofiber. The reversible assembly allows the nanostructure to dynamically reorganize in response to subtle perturbation of environment. The as-prepared CSNF is mechanical strong and can be used as a nano building block to fabricate high-strength film, wire, and straw. This study offers many opportunities for the biomimetic synthesis of new functional materials.
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Affiliation(s)
- Hongzhi Zheng
- State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, Guangzhou, 510641, China
| | - Xing Tong
- Department of Chemistry, UBC Faculty of Science, Vancouver Campus, 2036 Main Mall, Vancouver, BC, V6T 1Z1, Canada
| | - Yuping Zhang
- State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, Guangzhou, 510641, China
| | - Panchao Yin
- South China Advanced Institute for Soft Matter Science and Technology, South China University of Technology, Guangzhou, 510641, China
| | - Jiwang Yi
- State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, Guangzhou, 510641, China
| | - Zehong Chen
- State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, Guangzhou, 510641, China
| | - Haihong Lai
- State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, Guangzhou, 510641, China
| | - Wei Zhou
- Department of Mechanical Engineering, National University of Singapore, 3 Engineering Drive 2, Singapore, 117576, Singapore
| | - Linxin Zhong
- State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, Guangzhou, 510641, China
| | - Hao Zhuo
- Department of Mechanical Engineering, National University of Singapore, 3 Engineering Drive 2, Singapore, 117576, Singapore
| | - Xinwen Peng
- State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, Guangzhou, 510641, China
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Rupf SM, Moshtaha AL, Malischewski M. A decacationic ferrocene-based metallostar. Chem Sci 2023; 14:1132-1137. [PMID: 36756324 PMCID: PMC9891387 DOI: 10.1039/d2sc06151a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2022] [Accepted: 12/27/2022] [Indexed: 12/29/2022] Open
Abstract
Decacationic metallostars have been prepared by the reaction of permercurated ferrocene FeC10(HgO2CCF3)10 with superacidic (C5F5NH)(SbF6) (pK a = -11 estimated in H2O) in multigram scale. In the resulting compound, [FeC10Hg10(NC5F5) n ][SbF6]10, the labile pentafluoropyridine ligands are readily displaced by acetonitrile (MeCN) or tetrahydrothiophene (THT). In the X-ray structure of [FeC10Hg10(THT)10][SbF6]10·24 MeCN no cation-anion contacts between mercury and fluorine were observed. Moreover, cyclic voltammetry measurements of [FeC10(Hg(MeCN))10]10+ and [FeC10(Hg(THT))10]10+ revealed a (quasi)reversible one-electron oxidation of Fe(ii) to Fe(iii). From the reaction of [FeC10(Hg(MeCN))10]10+ with MoF6 as oxidant the ferrocenium cation [FeC10(Hg(MeCN))10]11+ was obtained and characterized via single crystal XRD. These electrophilic metallostars are promising potential building blocks for the synthesis of dendritic architectures containing a robust, tenfold functionalized ferrocene core.
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Fan X, Liu X, Liu F, Gu H. Thermo/β-cyclodextrin-responsive ferrocenyl hydrogels constructed by ROMP reaction. POLYMER 2023. [DOI: 10.1016/j.polymer.2023.125671] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
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Straube A, Coburger P, Michak M, Ringenberg MR, Hey-Hawkins E. The core of the matter - arene substitution determines the coordination and catalytic behaviour of tris(1-phosphanyl-1'-ferrocenylene)arene gold(I) complexes. Dalton Trans 2020; 49:16667-16682. [PMID: 33084677 DOI: 10.1039/d0dt02743j] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
Changing the aromatic core of C3-symmetric tris(ferrocenyl)arene-based tris-phosphanes has profound effects on their coordination behaviour towards gold(i). Depending on the arene (s-triazine, benzene, or trifluorobenzene), four different coordination modes can be distinguished and their preference has been rationalised using computational methods. The corresponding 1 : 1 ligand-to-metal complexes, studied by variable-temperature NMR spectroscopy, revealed fluctional behaviour in solution. Given the presence of up to three or six ferrocenylene spacers per complex, their electrochemistry was investigated. The redox-responsive nature of the complexes can be advantageously exploited in the catalytic ring-closing isomerisation of N-(2-propyn-1-yl)benzamide, where the benzene-based 2 : 3 ligand-to-metal complex has been shown to display multiple activity states depending on the degree of (reversible) oxidation in a preliminary trial.
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Affiliation(s)
- Axel Straube
- Institute of Inorganic Chemistry, Universität Leipzig, Johannisallee 29, D-04103 Leipzig, Germany.
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