- Structurally characterized homo-trinuclear ZnII and hetero-pentanuclear [ZnII4LnIII] complexes constructed from an octadentate bis(Salamo)-based ligand: Hirshfeld surfaces, fluorescence and catalytic properties
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One homo-trinuclear 3d and five novel windmill-type hetero-pentanuclear 3d-4f complexes [Zn3(L)(OAc)2(H2O)]·CH2Cl2 (1), [Zn4(L)2Sm(NO3)2(EtOH)2]N
- Li, Xiao-Yan,Kang, Quan-Peng,Liu, Chang,Zhang, Yang,Dong, Wen-Kui
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- Sulfonated 2D Covalent Organic Frameworks for Efficient Proton Conduction
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Open 1D channels found in covalent organic frameworks are unique and promising to serve as pathways for proton conduction; how to develop high-rate yet stable transporting systems remains a substantial challenge. Herein, this work reports a strategy for e
- Yang, Zongfan,Chen, Pei,Hao, Wenjing,Xie, Zhen,Feng, Yu,Xing, Guolong,Chen, Long
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- Synthesis and crystal structure of a novel triangular macrocyclic molecule, tris(H2saloph), and its water complex
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Condensation of 2,3-dihydroxybenzene-1,4-dicarbaldehyde and 1,2-phenylenediamine afforded a novel 30-membered macrocyclic hexaimine bearing six hydroxyl groups, in which a water molecule is trapped in the crystalline state.
- Akine, Shigehisa,Taniguchi, Takanori,Nabeshima, Tatsuya
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- A heteropore covalent organic framework for adsorptive removal of Cd(II) from aqueous solutions with high efficiency
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A heteropore covalent organic framework (COF) integrating tetraphenylethene skeleton and catechol segment is designed and synthesized. It exhibits extremely high stability in water under different pH conditions, which makes it an excellent material for adsorptive removal of Cd(II) from aqueous solutions with very fast adsorption kinetics, high uptake capacity, and good recyclability.
- Liu, Na,Shi, Liangfeng,Han, Xianghao,Qi, Qiao-Yan,Wu, Zong-Quan,Zhao, Xin
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- Synthesis and structural characterization of trinuclear Cu2+, Zn2+ and Zn2+-Eu3+ complexes based on 2,3-dihydroxybenzene-1,4-dicarbaldehyde, 1,3-bis(Aminooxy)propane with 3-ethoxysalicylaldehyde
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A novel bis(salamo)-type multipledentate chelating ligand H4L and its three Cu2+, Zn2+ and Zn2+-Eu3+ complexes have been designed and synthesized and characterized by elemental analyses, IR, UV-visibl
- Zhang, Jing,Zhang, Yang,Zhang, Shou-Ting,Dong, Xiu-Yan,Dong, Wen-Kui
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- Four rare structurally characterized hetero-pentanuclear [Zn4Ln] bis(salamo)-type complexes: Syntheses, crystal structures and spectroscopic properties
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Four new hetero-pentanuclear 3d-4f complexes [Zn4(L)2La(NO3)2(OEt)(H2O)] (1), [Zn4(L)2Ce(NO3)2(OMe)(MeOH)] (2), [Zn4(L)2Pr(NO3/s
- Pu, Lu-Mei,Wang, Lan,Li, Xiao-Yan,Sun, Yin-Xia,Kang, Quan-Peng,Long, Hai-Tao,Dong, Wen-Kui,Xu, Wei-Bing
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- Syntheses, luminescences and Hirshfeld surfaces analyses of structurally characterized homo-trinuclear ZnII and hetero-pentanuclear ZnII-LnIII (Ln?=?Eu, Nd) bis(salamo)-like complexes
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Homo-trinuclear [Zn3(L)(μ2-OAc)2(H2O)].CH2Cl2 (1) and hetero-pentanuclear [Zn4(L)2Eu(NO3)3(H2O)] (2) and [Zn4(L)2/sub
- Zhao, Qing,An, Xiao-Xin,Liu, Ling-Zhi,Dong, Wen-Kui
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- Helical metallohost-guest complexes via site-selective transmetalation of homotrinuclear complexes
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We have designed a new type of bis(N2O2) chelate ligand that affords a C-shaped O6 site on the metalation of the N2O2 sites. UV-vis and 1H NMR titration clearly showed that the complexation
- Akine, Shigehisa,Taniguchi, Takanori,Nabeshima, Tatsuya
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- Exceptional dual fluorescent, excited-state intramolecular proton-transfer (ESIPT) columnar liquid crystals characterized by J-stacking and large Stokes shifts
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Excited-State Intramolecular Proton-Transfer (ESIPT) fluorophores are emerging as promising future materials for electronic and biotechnological applications. ESIPT columnar (Col) liquid crystals (LCs) have been especially projected as the apt materials for advanced technological endeavors. But, there are hardly any explorations in this direction and thus, needing immediate attention. Herein we report on the synthesis, characterization, and ESIPT activity of a homologous series of novel phasmidic bis(N-salicylideneaniline) Col LCs. Optical microscopic, calorimetric and powder X-ray diffraction (XRD) studies evidence the occurrence of hexagonal columnar (Colh) phase having p6mm symmetry where the constituent slices result from the self-assembly of a pair of mesogens in a side-by-side manner facilitated by intense longitudinal π-π interactions. X-ray data confirm the absence of both directionally correlated tilting of the slices and transverse core-core interactions within the columns. Fluorescence probing clearly evidence the ESIPT occurring not only in DCM solution of the mesogens but also in their three-condensed states viz., solid, liquid crystal, and isotropic liquid phase; in general, two archetypal emission bands at ~430 nm (weak) and ~ 630 nm (strong) with large Stokes shifts (250–275 nm) of ESIPT phenomenon have been observed. The slow shift of emission maxima of the ESIPT fluorescence as a function of decreasing temperature without photoluminescence quenching coupled with the estimated tilt angle (?) of the slices normal to the columnar axis (37 to 42o), from the XRD data, confirm the formation of so-called Scheibe or J-aggregates. The redox activity, metal ion sensing ability, and solvatochromism of the mesogens have also been investigated. The study suggests that these ESIPT Col LCs with band-gap of about 3 eV can be regarded as wide-bandgap semiconducting materials having the electronic characteristics falling between those of conventional semiconductors and insulators.
- Kanakala, Madhu Babu,Yelamaggad, Channabasaveshwar V.
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- A 3D Anionic Metal Covalent Organic Framework with soc Topology Built from an Octahedral TiIV Complex for Photocatalytic Reactions
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The construction of three-dimensional (3D) covalent organic frameworks (COFs) remains challenging due to the limited types of organic building blocks. With octahedral TiIV complex as the building unit, this study reports on the first 3D anionic
- Chen, Chuan-Jie,Gu, Zhi-Guo,Han, Wang-Kang,Lu, Hui-Shu,Niu, Tengfei,Yan, Xiaodong
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p. 17881 - 17886
(2021/07/16)
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- Alternating Copolymerization of CO2and Cyclohexene Oxide Catalyzed by Cobalt-Lanthanide Mixed Multinuclear Complexes
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Heteromultimetallic complexes consisting of three Co(II) ions and one lanthanide ion were synthesized and applied to the alternating copolymerization of CO2 and cyclohexene oxide. Unlike the conventional cobalt(III) salen complexes, the high thermal stabi
- Asaba, Hiroki,Deng, Jingyuan,Hatazawa, Masahiro,Iwasaki, Takanori,Mashima, Kazushi,Nagae, Haruki,Nozaki, Kyoko
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p. 7928 - 7933
(2020/06/24)
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- BIS-BENZIMIDAZOLE COMPOUNDS AND METHODS OF USING SAME
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Provided herein are compounds and methods for modulating abnormal repeat expansions of gene sequences. More particularly, provided are inhibitors of RNA and the uses of such inhibitors in regulating nucleotide repeat expansions, e.g., to treat Myotonic Dystrophy Type 1 (DM1 ), Myotonic Dystrophy Type 2 (DM2), Fuchs dystrophy, Huntington Disease, Amyotrophic Lateral Sclerosis, or Frontotemporal Dementia.
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- A Novel Strategy for the Construction of Covalent Organic Frameworks from Nonporous Covalent Organic Polymers
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The field of covalent organic frameworks (COFs) has been developed significantly in the past decade on account of their important characteristics and vast application potential. On the other hand, the discovery of novel synthetic methodology is still a ch
- Miao, Zhuang,Liu, Guiyan,Cui, Yumeng,Liu, Zhengyu,Li, Jinheng,Han, Fangwai,Liu, Yu,Sun, Xiaoxiao,Gong, Xuefang,Zhai, Yufeng,Zhao, Yanli,Zeng, Yongfei
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supporting information
p. 4906 - 4910
(2019/03/11)
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- Lanthanide Complexes Supported by a Trizinc Crown Ether as Catalysts for Alternating Copolymerization of Epoxide and CO2: Telomerization Controlled by Carboxylate Anions
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A new family of heterometallic catalysts based on trimetalated macrocyclic tris(salen) ligands and rare-earth metals was prepared and structurally characterized. The LaZn3 system containing anionic ligands such as acetate plays a critical role in catalyzing the alternating copolymerization of cyclohexene oxide (CHO) and CO2 with a high proportion of carbonate linkages. Among the lanthanide metals, the CeZn3 system exhibits high catalytic activity with a turnover frequency (TOF) of over 370 h?1. NMR analysis of the complex and end-group analysis of the polymer suggest that the acetate ligands are rapidly exchanged, not only among coordinated acetates, but also between coordinated acetates and added carboxylate anions. These unique properties make this the first example of telomerization for the copolymerization of CHO and CO2.
- Nagae, Haruki,Aoki, Ryota,Akutagawa, Shin-Nosuke,Kleemann, Julian,Tagawa, Risa,Schindler, Tobias,Choi, Gyeongshin,Spaniol, Thomas P.,Tsurugi, Hayato,Okuda, Jun,Mashima, Kazushi
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supporting information
p. 2492 - 2496
(2018/01/27)
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- Enhanced performance in gas adsorption and Li ion batteries by docking Li+ in a crown ether-based metal-organic framework
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Incorporating supramolecular interaction units, crown ether rings, into metal-organic frameworks enables the docking of metal ions through complexation for enhanced performance in H2 and CO2 adsorption and lithium ion batteries.
- Bai, Linyi,Tu, Binbin,Qi, Yi,Gao, Qiang,Liu, Dong,Liu, Zhizhou,Zhao, Lingzhi,Li, Qiaowei,Zhao, Yanli
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p. 3003 - 3006
(2016/02/19)
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- Designed synthesis of porphyrin-based two-dimensional covalent organic frameworks with highly ordered structures
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Porphyrins are representative functional π-systems; synthesizing their highly ordered structures is an established goal in chemistry. Here, we report the designed synthesis of a series of porphyrin-based covalent organic frameworks with highly ordered structures through polycondensation. The porphyrinbased frameworks exhibited high crystallinity, high porosity, and extended π-conjugation over the polyporphyrin sheets.
- Chen, Xiong,Gao, Jia,Jiang, Donglin
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p. 1257 - 1259
(2015/09/22)
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- Towards covalent organic frameworks with predesignable and aligned open docking sites
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A strategy for the synthesis of covalent organic frameworks with open docking sites is developed. The docking sites are ordered on the channel walls and structurally predesignable for meeting various types of noncovalent interactions, thus opening a way towards designing supramolecular materials based on crystalline porous organic frameworks. This journal is the Partner Organisations 2014.
- Chen, Xiong,Huang, Ning,Gao, Jia,Xu, Hong,Xu, Fei,Jiang, Donglin
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p. 6161 - 6163
(2014/06/09)
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- Liquid crystalline bis(N-salicylideneaniline)s: Synthesis and thermal behavior of constitutional isomers
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The first examples of mesogenic bis(N-salicylideneaniline)s (BSANs), wherein two lipophilic (half-disk shaped) entities are interlinked through the dihydroxydiformylbenzene core, were synthesized and characterized. In particular, three constitutional (positional) isomeric BSANs were prepared by the facile twofold condensation of 3,4,5-tris(alkoxy)anilines with 2,3-dihydroxyterephthalaldehyde, 4,6-dihydroxyisophthalaldehyde, and 2,5-dihydroxyterephthalaldehyde and their structures were established by elemental analyses, FT-IR, 1H NMR, and 13C NMR. Proton NMR experiments demonstrated their existence in enol-imine (OH) form solely. Polarizing optical microscopic, differential scanning calorimetric, and powder X-ray diffraction studies evidenced the occurrence of columnar mesomorphism in two sets of isomers.
- Hiremath, Uma S.
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p. 3419 - 3423
(2013/07/04)
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- Synthesis, crystal structure, and fluorescence of an unexpected dialkoxo-bridged dinuclear copper(II) complex with bis(salen)-type tetraoxime
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An unexpected dinuclear Cu(II) complex, [Cu2(L2) 2] (H2L2=3-methoxysalicylaldehyde O-(2-hydroxyethyl)oxime), has been synthesized via complexation of Cu(II) acetate monohydrate with H4Lsup
- Chai, Lan-Qin,Wang, Gang,Sun, Yin-Xia,Dong, Wen-Kui,Zhao, Li,Gao, Xiong-Hou
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p. 1621 - 1631
(2012/06/01)
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- Synthesis and properties of bimetallic Hoveyda-Grubbs metathesis catalysts
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The catalytic activity of ruthenium Hoveyda-Grubbs complexes in olefin metathesis is a function of complex steric and electronic effects acting on initiation and propagation steps. In order to study the π-electron factors influencing the initiation process, we attempted syntheses of bimetallic complexes with common organic ligands bearing two chelate rings. While most of the studied ligand exchange reactions of the isomeric bis-chelating benzene derivatives gave mixtures of unstable complexes, a homodinuclear derivative of 1,4-dimethoxy-2,5-divinylbenzene was sparingly soluble and precipitated from the reaction mixture in a pure form. The complex was studied with spectroscopic and X-ray methods, which confirmed the symmetrical bimetallic structure. However, in model metathesis reactions the catalyst displayed activity very comparable to the related monometallic complexes. This suggests that in the bimetallic system two consecutive initiation processes of the metathesis catalyst (first, bimetallic complex + olefin → monometallic complex + propagating species; second, monometallic complex + olefin → styrene + propagating species) proceed at similar rates and, thus, no cooperativity between the two steps is displayed. Properties of the family of bimetallic complexes were probed with NMR studies, and π-electronic effects operating in the systems were discussed.
- Grudzien, Krzysztof,Malinska, Maura,Barbasiewicz, Michal
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p. 3636 - 3646
(2012/07/13)
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- Novel endotoxin-sequestering compounds with terephthalaldehyde-bis- guanylhydrazone scaffolds
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We have shown that lipopolyamines bind to the lipid A moiety of lipopolysaccharide, a constituent of Gram-negative bacterial membranes, and neutralize its toxicity in animal models of endotoxic shock. In an effort to identify non-polyamine scaffolds with
- Khownium, Kriangsak,Wood, Stewart J.,Miller, Kelly A.,Balakrishna, Rajalakshmi,Nguyen, Thuan B.,Kimbrell, Matthew R.,Georg, Gunda I.,David, Sunil A.
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p. 1305 - 1308
(2007/10/03)
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