- Supramolecular 2D monolayered nanosheets constructed by using synergy of non-covalent interactions
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Here, a straightforward and rational approach to construct supramolecular assemblies with ordered nanostructures in a two-dimensional arrangement is reported. Taking advantage of the synergistic effect of multiple non-covalent interactions (hydrogen bonding and π-π interactions), the designed molecular monomer has a specific orientation in the self-assembly process, thus realizing two-dimensional control. Supramolecular two-dimensional nanosheets with single-layer thickness and controllable dimensions have been obtained, which can be clearly confirmed using TEM, SEM, AFM and XRD and by comparing with the self-assembled structures of the control system. The strategy of collaborative self-assembly proposed here using multiple non-covalent interactions is expected to be extended to the construction of various kinds of unique supramolecular 2D materials. This journal is
- Ding, Qinwen,Dong, Zeyuan,Qi, Shuaiwei,Wang, Wenzhe,Zhang, Chenyang,Zhang, Hongyu,Zhang, Jing
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- Fabricating Covalent Organic Framework Capsules with Commodious Microenvironment for Enzymes
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Enzyme immobilization has been demonstrated to be a favorable protocol to promote industrialization of biomacromolecules. Despite tremendous efforts to develop new strategies and materials to realize this process, maintaining enzyme activity is still a fo
- Andaloussi, Yassin H.,Chen, Yao,Cheng, Peng,Li, Ang,Li, Mingmin,Li, Xia,Ma, Shengqian,Qiao, Shan,Zhang, Zhenjie,Zheng, Yunlong
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- Synthesis and antimicrobial activities of 2,5-substituent hydroquinone derivatives
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A series of 2,5-substituent hydroquinone derivatives were designed and synthesized. Their structures were identified by elemental analysis, 1H NMR, IR spectra. Their assayed antibacterial (Escherichia coli, Bacillus subtilis) and antifungal (Candida albicans) activities were also evaluated by MTT (3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyl tetrazolium bromide) method. The results of biological test showed compounds 1 and 10 have favorable antimicrobial activity with MICs of 20.5, 24.6, 18.9 and 28.6 μg/mL against Escherichia coli and Bacillus subtilis, respectively.
- Liu, Hui-Lian,Wang, Qing-Zhong
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- Alkylation of methyl 4-chloro-3-oxobutanoate with di- and tribromoalkanes
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Alkylation of methyl 4-chloro-3-oxobutanoate with 1,2-dibromoethane, 1,3-dibromopropane, and 1,2,3-tribromopropane afforded the corresponding dimethyl 2,5-dioxocyclohexane-1,4-dicarboxylate enol ethers.
- Ismailov,Ibragimova,Sadykhova,Mamedov,Nagiev,Yusubov
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- Amidation, Esterification, and Thioesterification of a Carboxyl-Functionalized Covalent Organic Framework
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Three new post-synthetic modification reactions, namely amidation, esterification, and thioesterification, were demonstrated on a novel highly crystalline two-dimensional covalent organic framework (COF), COF-616, bearing pre-installed carboxyl groups. Th
- Guo, Lei,Jia, Shang,Diercks, Christian S.,Yang, Xuejing,Alshmimri, Sultan A.,Yaghi, Omar M.
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- Synthesis and Self-Assembly of Mixed-Graft Block Copolymers
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Mixed-graft block copolymers (mGBCPs) consist of two or more types of polymeric side chains grafted on a linear backbone in a random, alternating, or pseudo-alternating sequence. They can phase-separate with the backbone serving as the interface of the bl
- Le, An N.,Liang, Ruiqi,Zhong, Mingjiang
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- EUROPIUM BASED METAL ORGANIC FRAMEWORK FOR PALLADIUM SENSING
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A method of detecting Pd2+ in an aqueous solution is described. The method involves mixing an Eu-based metal organic framework with the aqueous solution and measuring the amount of fluorescence quenching. The fluorescence quenching is specific
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Paragraph 0090
(2021/01/26)
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- Crystal Flexibility Design through Local and Global Motility Cooperation
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Incorporating local mobility into a flexible framework promises to create cooperative properties unattainable in a conventional soft porous crystal. In this study, we propose a design strategy that integrates substituent moieties and a flexible porous crystal framework via intra-framework π–π interactions. This integration not only facilitates framework structural transitions but also gives the porous coordination polymers (PCPs) different guest-free structures that depend on the activation conditions. The incorporated flexibility gives the material the ability to discriminate C6 alkane isomers based on different gate-opening behaviors. Thus, the PCP has potential applications in C6 isomer separation, a critical step in the petroleum refining process to produce gasoline with high octane rating. This strategy, based on ligand designability, offers a new approach to flexible PCP structural and functional design.
- Wang, Ping,Otake, Ken-ichi,Hosono, Nobuhiko,Kitagawa, Susumu
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supporting information
p. 7030 - 7035
(2021/02/26)
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- Fine-tuning the pore structure of metal-organic frameworks by linker substitution for enhanced hydrogen storage and gas separation
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The modification of metal-organic frameworks (MOFs) by functionalizing ligands has been investigated for improved properties. In this study, by introducing substituents to the backbone of organic linkers, isostructural dihydroxy-/dialkoxy-functionalized Zr-MOFs were delicately constructed and sophisticatedly characterized for crystallinity, morphology, porosity and structural defects. Pure-component CO2, CH4, N2, and H2adsorption isotherms on the microporous synthesized materials were investigated under the pressure up to 10 MPa at 303 K. By the ideal adsorbed solution theory (IAST) model, enhanced adsorption selectivity towards CO2/N2, CO2/CH4, CH4/N2and CO2/H2binary mixtures was observed compared to the parent material, and dihydroxy functionalization endows the material with high selectivity towards CO2/H2. Moreover, the diethoxy-functionalized material with narrow cavities exhibits improved high pressure H2adsorption due to structural defects and strong overlapping potentials.
- Han, Xiwei,Yang, Xiaoxian,Yu, Chuan,Lu, Shuyan,Pouya, Ehsan Sadeghi,Bai, Peng,Lyu, Jiafei,Guo, Xianghai
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p. 3026 - 3032
(2021/05/03)
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- An Ultrasensitive and Selective Metal-Organic Framework Chemosensor for Palladium Detection in Water
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A new europium-based metal-organic framework, termed KFUPM-3, was constructed using an allyloxy-functionalized linker. As a result of coordinative interactions between the allyloxy moieties and Pd2+, highly selective changes in both the absorpt
- Helal, Aasif,Nguyen, Ha L.,Al-Ahmed, Amir,Cordova, Kyle E.,Yamani, Zain H.
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supporting information
p. 1738 - 1741
(2019/02/12)
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- Substituent effect on redox potential of terephthalate-based electrode materials for lithium batteries
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The substituent effect on the redox potential of lithium terephthalate was studied using symmetrical dilithium disubstituted-terephthalates incorporating bromo, methoxy and amino groups. All the terephthalate derivatives have been synthesized and evaluated as anode material for lithium-ion batteries. The electrochemical results revealed an increase in the reduction potential in the case of bromo and methoxy groups and almost the same in the case of amino group compared to unmodified dilithium terephthalate. In addition, a very first tendency between the 13C chemical shifts and FTIR signal of the carbonyl and the reduction potential of the studied disubstituted-terephthalates was formulated.
- Lakraychi,Dolhem,Djeda?ni-Pilard,Becuwe
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- Ultrasonic Exfoliation of Hydrophobic and Hydrophilic Metal–Organic Frameworks To Form Nanosheets
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The modular structure of metal–organic framework nanosheets (MONs) provides a convenient route to creating two-dimensional materials with readily tuneable surface properties. Here, the liquid exfoliation of two closely related layered metal–organic framew
- Ashworth, David J.,Cooper, Adam,Trueman, Mollie,Al-Saedi, Rasha W. M.,Smith, Liam D.,Meijer, Anthony J. H. M.,Foster, Jonathan A.
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supporting information
p. 17986 - 17996
(2018/11/23)
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- Liquid exfoliation of alkyl-ether functionalised layered metal-organic frameworks to nanosheets
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We report the synthesis of a 2D-layered metal-organic framework incorporating weakly interacting chains designed to aid exfoliation of the layers into nanosheets. Dispersion of the nanosheets exposes labile metal-sites which are shown to exchange solvent
- Foster, Jonathan A.,Henke, Sebastian,Schneemann, Andreas,Fischer, Roland A.,Cheetham, Anthony K.
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supporting information
p. 10474 - 10477
(2016/09/02)
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- A highly efficient metal-free approach to: Meta - And multiple-substituted phenols via a simple oxidation of cyclohexenones
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A novel and efficient metal-free approach to substituted phenols has been disclosed from simple and readily available cyclohexenones and cyclohexenone equivalents. Dimethyl sulfoxide (DMSO), a simple and common organic reagent, was employed as a mild oxidant in this I2-catalysis, which significantly tolerates various substituents including some easily oxidizable or reducible functionalities. The challenging meta- and multiple-substituted phenols could be well prepared by this method. The metal-free and mild oxidation make this protocol very simple, practical, and easy to handle.
- Liang, Yu-Feng,Song, Song,Ai, Lingsheng,Li, Xinwei,Jiao, Ning
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supporting information
p. 6462 - 6467
(2018/06/08)
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- Zinc-1,4-benzenedicarboxylate-bipyridine frameworks - Linker functionalization impacts network topology during solvothermal synthesis
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Substitution of 1,4-benzenedicarboxylate (bdc) with additional alkoxy chains is the key to construct a family of metal-organic frameworks (MOFs) of the type [Zn2(fu-bdc)2(bipy)]n (fu-bdc = functionalized bdc; bipy = 4,4′-bipyridine) exhibiting a honeycomb-like topology instead of the default pillared square-grid topology. Both the substitution pattern of the phenyl ring of the fu-bdc linker and the chain length of the alkoxy substituents have a major impact on the structure of the derived frameworks. Substitution at positions 2 and 3 leads to the trivial pillared square-grid framework, and substitution at positions 2 and 5 or 2 and 6 yields MOFs with the honeycomb-like topology. Also, simple methoxy substituents lead to the construction of a pillared square-grid topology, whereas longer substituents like ethoxy, n-propoxy, and n-butoxy generate honeycomb-like framework structures. These honeycomb MOFs feature one-dimensional channels, which are tuneable in diameter and functionality by the choice of substituent attached to the bdc-type linker. Pure component sorption isotherms indicate that the honeycomb-like frameworks selectively adsorb CO2 over N 2 and CH4. The Royal Society of Chemistry 2011.
- Henke, Sebastian,Schneemann, Andreas,Kapoor, Shobhna,Winter, Roland,Fischer, Roland A.
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scheme or table
p. 909 - 918
(2012/03/27)
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- PHENOLIC COMPOUNDS WITH ANTIOXIDANT AND ANTI-CANCER PROPERTIES, ANALOGS AND SYNTHESIS THEREOF
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The present document describes a phytochemical isolated from maple syrup and composition comprising the same. More specifically, the document describes an antioxidant phytochemical compound, derivates thereof, and composition comprising the same. The document also describes a process of synthesizing the antioxidant phytochemical compound.
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Page/Page column 54
(2013/02/27)
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- Synthesis and anti-HIV activities of bis-(cycloSaligenyl) pronucleotides derivatives of 3′-fluoro-3′-deoxythymidine and 3′-azido- 3′-deoxythymidine
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Anti-HIV nucleoside monophosphates have limited cellular uptake due to the presence of negatively-charged phosphate group. Bis-(cycloSaligenyl) derivatives containing two anti-HIV nucleosides, 3′-fluoro-3′-deoxythymidine (FLT) and 3′-azido-3′-deoxythymidi
- Ahmadibeni, Yousef,Tiwari, Rakesh,Swepson, Chelsie,Pandhare, Jui,Dash, Chandravanu,Doncel, Gustavo F.,Parang, Keykavous
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supporting information; experimental part
p. 802 - 805
(2011/03/21)
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- 2,5-Dihydroxyterephthalates, 2,5-dichloro-1,4-benzoquinone-3,6- dicarboxylates, and polymorphic 2,5-dichloro-3,6-dihydroxyterephthalates
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Reaction of 2,5-dihydroxycyclohexa-1,4-diene-1,4-dicarboxylates with one equivalent of N-chlorosuccinimide cleanly gives 2,5-dihydroxyterephthalates; reaction with four equivalents of N-chlorosuccinimide gives 2,5-dichloro-l,4- benzoquinone-3,6-dicarboxylates instead. The latter compounds react with sodium dithionite to give 2,5-dichloro-3,6-dihydroxyterephthalates, which will find use in the study of polymorphic phase changes. Georg Thieme Verlag Stuttgart.
- Hintermann, Lukas,Suzuki, Keisuke
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experimental part
p. 2303 - 2306
(2009/04/06)
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- Isolation of bright blue fluorescent substances from sonochemical hydroxylation of methyl p-cyanobenzoate
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Sonochemical hydroxylation of methyl p-cyanobenzoate (1a) in water gave a bright blue fluorescence, which are mainly ascribed to three new fluorescent compounds, 3-hydroxy, 2,3- and 2,5-dihydroxy derivatives of 1a. Other benzenes substituted with electron-withdrawing groups also gave similar fluorescence from their hydroxylated derivatives. Among the fluorescence substances, methyl 2,5-dihydroxybenzoate was supposed to be applicable for a fluorescent chemosensor.
- Yamada, Sachiko,Hokari, Hajime,Akasaka, Shinji,Iwamura, Michiko
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p. 197 - 198
(2007/10/03)
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- 140. Construction of Highly Substituted Nitroaromatic Systems by Cyclocondensation. Part I. Synthesis of 4-Nitro-3-oxobutyrate
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Methyl 4-nitro-3-oxobutyrate (1) is prepared by substitution of 4-bromo- and 4-iodo-3-oxobutyrate enol ether or enol acetate derivatives with nitrite and deprotection of the keto function (Schemes 2 and 3).A much more convenient access to 1 is, however, t
- Duthaler, Rudolf O.
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p. 1475 - 1492
(2007/10/02)
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