1
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Barlow SR, Akien GR, Evans NH. Hydrogen bond templated synthesis of catenanes and rotaxanes from a single isophthalic acid derivative. Org Biomol Chem 2023; 21:402-414. [PMID: 36525263 DOI: 10.1039/d2ob02019j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Hydrogen bond templated [2]catenanes and [2]rotaxanes have been synthesized using azide precursors derived from a single isophthalic acid derivative precursor. The interlocked molecules were prepared using either stoichiometric or near stoichiometric amounts of macrocycle and CuAAC "click" precursors, with yields of up to 70% for the mechanical bond formation step. Successful preparation of the interlocked structures was confirmed by NMR spectroscopy and mass spectrometry, with detail of co-conformational behaviour being elucidated by a range of 1H NMR spectroscopic experiments.
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Affiliation(s)
- Sean R Barlow
- Department of Chemistry, Lancaster University, Lancaster, LA1 4YB, UK.
| | - Geoffrey R Akien
- Department of Chemistry, Lancaster University, Lancaster, LA1 4YB, UK.
| | - Nicholas H Evans
- Department of Chemistry, Lancaster University, Lancaster, LA1 4YB, UK.
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2
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Chambers LI, Yufit DS, Musa OM, Steed JW. Understanding the Interaction of Gluconamides and Gluconates with Amino Acids in Hair Care. CRYSTAL GROWTH & DESIGN 2022; 22:6190-6200. [PMID: 36217417 PMCID: PMC9542698 DOI: 10.1021/acs.cgd.2c00753] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 07/04/2022] [Revised: 09/07/2022] [Indexed: 06/16/2023]
Abstract
A hair care mixture formed from a gluconamide derivative and 3-hydroxypropyl ammonium gluconate is known to strengthen hair fibers; however, the mechanism by which the mixture affects hair is unknown. To give insight into the aggregation of the target gluconamide and potential interactions between the gluconate-derived mixture and hair fibers, a range of systems were characterized by X-ray crystallography namely two polymorphic forms of the target gluconamide and three salts of 3-hydroxypropylammonium with sulfuric acid, methane sulfonic acid, and oxalic acid. The gluconamide proves to aggregate and becomes a supramolecular gelator in aniline and benzyl alcohol solution. The resulting gels were characterized by rheology, scanning electron microscopy, proton nuclear magnetic resonance, Fourier transform infrared spectroscopy, and powder X-ray diffraction.
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Affiliation(s)
- Luke I. Chambers
- Department
of Chemistry, Lower Mountjoy, Durham University, Stockton Road, Durham DH1 3LE, U.K.
| | - Dmitry S. Yufit
- Department
of Chemistry, Lower Mountjoy, Durham University, Stockton Road, Durham DH1 3LE, U.K.
| | - Osama M. Musa
- Ashland
LLC, 1005 Route 202/206, Bridgewater, New Jersey 08807, United States
| | - Jonathan W. Steed
- Department
of Chemistry, Lower Mountjoy, Durham University, Stockton Road, Durham DH1 3LE, U.K.
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3
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A Review on Synthesis Methods of Phyllosilicate- and Graphene-Filled Composite Hydrogels. JOURNAL OF COMPOSITES SCIENCE 2022. [DOI: 10.3390/jcs6010015] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
This review discusses, in brief, the various synthetic methods of two widely-used nanofillers; phyllosilicate and graphene. Both are 2D fillers introduced into hydrogel matrices to achieve mechanical robustness and water uptake behavior. Both the fillers are inserted by physical and chemical gelation methods where most of the chemical gelation, i.e., covalent approaches, results in better physical properties compared to their physical gels. Physical gels occur due to supramolecular assembly, van der Waals interactions, electrostatic interactions, hydrophobic associations, and H-bonding. For chemical gelation, in situ radical triggered gelation mostly occurs.
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4
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Kitagawa H, Kikuchi M, Sato S, Watanabe H, Umezawa N, Kato M, Hisamatsu Y, Umehara T, Higuchi T. Structure-Based Identification of Potent Lysine-Specific Demethylase 1 Inhibitor Peptides and Temporary Cyclization to Enhance Proteolytic Stability and Cell Growth-Inhibitory Activity. J Med Chem 2021; 64:3707-3719. [PMID: 33754721 DOI: 10.1021/acs.jmedchem.0c01371] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
Peptides are attractive drug candidates, but their utility is greatly limited by their inherent susceptibility to proteolytic degradation and their inability to pass through the cell membrane. Here, we employ a strategy of temporary cyclization to develop a cell-active lysine-specific demethylase 1 (LSD1/KDM1A) inhibitor peptide. We first identified a highly potent LSD1-inhibitory linear peptide, with the assistance of X-ray crystal structure data of inhibitor peptide-bound LSD1·CoREST. The peptide was converted to a redox-activatable cyclic peptide incorporating cell-penetrating peptide (CPP), expecting selective activation under intracellular reducing conditions. The cyclic peptide moiety exhibited enhanced stability to protease and was converted to the linear, unmodified LSD1 inhibitor peptide under reducing conditions. The cyclic peptide with CPP inhibited the proliferation of human acute myeloid leukemia cells (HL-60) in the low micromolar concentration range.
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Affiliation(s)
- Hiroki Kitagawa
- Graduate School of Pharmaceutical Sciences, Nagoya City University, 3-1 Tanabe-dori, Mizuho-ku, Nagoya, Aichi 467-8603, Japan
| | - Masaki Kikuchi
- Laboratory for Epigenetics Drug Discovery, RIKEN Center for Biosystems Dynamics Research, 1-7-22 Suehiro-cho, Tsurumi-ku, Yokohama, Kanagawa 230-0045, Japan
| | - Shin Sato
- Laboratory for Epigenetics Drug Discovery, RIKEN Center for Biosystems Dynamics Research, 1-7-22 Suehiro-cho, Tsurumi-ku, Yokohama, Kanagawa 230-0045, Japan
| | - Hisami Watanabe
- Laboratory for Epigenetics Drug Discovery, RIKEN Center for Biosystems Dynamics Research, 1-7-22 Suehiro-cho, Tsurumi-ku, Yokohama, Kanagawa 230-0045, Japan
| | - Naoki Umezawa
- Graduate School of Pharmaceutical Sciences, Nagoya City University, 3-1 Tanabe-dori, Mizuho-ku, Nagoya, Aichi 467-8603, Japan
| | - Maiko Kato
- Graduate School of Pharmaceutical Sciences, Nagoya City University, 3-1 Tanabe-dori, Mizuho-ku, Nagoya, Aichi 467-8603, Japan
| | - Yosuke Hisamatsu
- Graduate School of Pharmaceutical Sciences, Nagoya City University, 3-1 Tanabe-dori, Mizuho-ku, Nagoya, Aichi 467-8603, Japan
| | - Takashi Umehara
- Laboratory for Epigenetics Drug Discovery, RIKEN Center for Biosystems Dynamics Research, 1-7-22 Suehiro-cho, Tsurumi-ku, Yokohama, Kanagawa 230-0045, Japan
| | - Tsunehiko Higuchi
- Graduate School of Pharmaceutical Sciences, Nagoya City University, 3-1 Tanabe-dori, Mizuho-ku, Nagoya, Aichi 467-8603, Japan
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5
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Tavares MR, Bláhová M, Sedláková L, Elling L, Pelantová H, Konefał R, Etrych T, Křen V, Bojarová P, Chytil P. High-Affinity N-(2-Hydroxypropyl)methacrylamide Copolymers with Tailored N-Acetyllactosamine Presentation Discriminate between Galectins. Biomacromolecules 2020; 21:641-652. [PMID: 31904940 DOI: 10.1021/acs.biomac.9b01370] [Citation(s) in RCA: 25] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
N-Acetyllactosamine (LacNAc; Galβ4GlcNAc) is a typical disaccharide ligand of galectins. The most abundant members of these human lectins, galectin-1 (Gal-1) and galectin-3 (Gal-3), participate in a number of pathologies including cancerogenesis and metastatic formation. In this study, we synthesized a series of fifteen N-(2-hydroxypropyl)methacrylamide (HPMA)-based glycopolymers with varying LacNAc amounts and presentations and evaluated the impact of their architecture on the binding affinity to Gal-1 and Gal-3. The controlled radical reversible addition-fragmentation chain transfer copolymerization technique afforded linear polymer precursors with comparable molecular weight (Mn ≈ 22,000 g mol-1) and narrow dispersity (D̵ ≈ 1.1). The precursors were conjugated with the functionalized LacNAc disaccharide (4-22 mol % content in glycopolymer) prepared by enzymatic synthesis under catalysis by β-galactosidase from Bacillus circulans. The structure-affinity relationship study based on the enzyme-linked immunosorbent assay revealed that the type of LacNAc presentation, individual or clustered on bi- or trivalent linkers, brings a clear discrimination (almost 300-fold) between Gal-1 and Gal-3, reaching avidity to Gal-1 in the nanomolar range. Whereas Gal-1 strongly preferred a dense presentation of individually distributed LacNAc epitopes, Gal-3 preferred a clustered LacNAc presentation. Such a strong galectin preference based just on the structure of a multivalent glycopolymer type is exceptional. The prepared nontoxic, nonimmunogenic, and biocompatible glycopolymers are prospective for therapeutic applications requiring selectivity for one particular galectin.
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Affiliation(s)
- Marina Rodrigues Tavares
- Institute of Macromolecular Chemistry , Czech Academy of Sciences , Heyrovského náměstí 2 , CZ-162 06 Prague 6 , Czech Republic
| | - Markéta Bláhová
- Institute of Macromolecular Chemistry , Czech Academy of Sciences , Heyrovského náměstí 2 , CZ-162 06 Prague 6 , Czech Republic
| | - Lieselotte Sedláková
- Institute of Microbiology , Czech Academy of Sciences , Vídeňská 1083 , CZ-142 20 Prague 4 , Czech Republic.,Department of Health Care Disciplines and Population Protection, Faculty of Biomedical Engineering , Czech Technical University in Prague , Sítná sq. 3105 , CZ-272 01 Kladno , Czech Republic
| | - Lothar Elling
- Institute of Biotechnology and Helmholtz Institute for Biomedical Engineering , RWTH Aachen , Pauwelstr. 20 , D-52079 Aachen , Germany
| | - Helena Pelantová
- Institute of Microbiology , Czech Academy of Sciences , Vídeňská 1083 , CZ-142 20 Prague 4 , Czech Republic
| | - Rafał Konefał
- Institute of Macromolecular Chemistry , Czech Academy of Sciences , Heyrovského náměstí 2 , CZ-162 06 Prague 6 , Czech Republic
| | - Tomáš Etrych
- Institute of Macromolecular Chemistry , Czech Academy of Sciences , Heyrovského náměstí 2 , CZ-162 06 Prague 6 , Czech Republic
| | - Vladimír Křen
- Institute of Microbiology , Czech Academy of Sciences , Vídeňská 1083 , CZ-142 20 Prague 4 , Czech Republic
| | - Pavla Bojarová
- Institute of Microbiology , Czech Academy of Sciences , Vídeňská 1083 , CZ-142 20 Prague 4 , Czech Republic.,Department of Health Care Disciplines and Population Protection, Faculty of Biomedical Engineering , Czech Technical University in Prague , Sítná sq. 3105 , CZ-272 01 Kladno , Czech Republic
| | - Petr Chytil
- Institute of Macromolecular Chemistry , Czech Academy of Sciences , Heyrovského náměstí 2 , CZ-162 06 Prague 6 , Czech Republic
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6
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Liu Y, Rowell N, Willis M, Zhang M, Wang S, Fan H, Huang W, Chen X, Yu K. Photoluminescent Colloidal Nanohelices Self-Assembled from CdSe Magic-Size Clusters via Nanoplatelets. J Phys Chem Lett 2019; 10:2794-2801. [PMID: 31084015 DOI: 10.1021/acs.jpclett.9b00838] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
Reports on photoluminescent colloidal semiconductor two-dimensional (2D) helical nanostructures with one-dimensional quantum confinement are relatively rare. Here, we discuss the formation of such photoluminescent nanostructures for CdSe. We show that when as-synthesized unpurified zero-dimensional (0D) CdSe magic-size clusters (MSCs) (passivated by carboxylate ligands with three-dimensional quantum confinement) are dispersed in a solvent (such as toluene or chloroform) containing hexadecylamine and then subjected to sonication, helical nanostructures are obtained, as observed by transmission electron microscopy. We demonstrate that the formation involves the self-assembly of 0D MSCs into 2D nanoplatelets, which act as intermediates. The CdSe MSCs and their self-assembled 2D nanostructures display almost identical static optical properties, namely, a sharp absorption doublet with peaks at 433 and 460 nm and a narrow emission peak at 465 nm; this is a subject for further study. This study introduces new methods for fabricating photoluminescent helical nanostructures via the self-assembly of photoluminescent MSCs.
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Affiliation(s)
- Yuanyuan Liu
- Institute of Atomic and Molecular Physics , Sichuan University , 610065 Sichuan , P. R. China
| | - Nelson Rowell
- Metrology Research Centre , National Research Council Canada , Ottawa , Ontario K1A 0R6 , Canada
| | - Maureen Willis
- School of Physical Science and Technology , Sichuan University , 610065 Sichuan , P. R. China
| | - Meng Zhang
- Institute of Atomic and Molecular Physics , Sichuan University , 610065 Sichuan , P. R. China
| | - Shanling Wang
- Analytical & Testing Center , Sichuan University , 610065 Sichuan , P. R. China
| | - Hongsong Fan
- Engineering Research Center in Biomaterials , Sichuan University , 610065 Sichuan , P. R. China
| | - Wen Huang
- Laboratory of Ethnopharmacology, West China School of Medicine , Sichuan University , 610065 Sichuan , People's Republic of China
| | - Xiaoqin Chen
- Engineering Research Center in Biomaterials , Sichuan University , 610065 Sichuan , P. R. China
| | - Kui Yu
- Institute of Atomic and Molecular Physics , Sichuan University , 610065 Sichuan , P. R. China
- Engineering Research Center in Biomaterials , Sichuan University , 610065 Sichuan , P. R. China
- State Key Laboratory of Polymer Materials Engineering , Sichuan University , 610065 Sichuan , P. R. China
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7
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Kortekaas L, Chen J, Jacquemin D, Browne WR. Proton-Stabilized Photochemically Reversible E/ Z Isomerization of Spiropyrans. J Phys Chem B 2018; 122:6423-6430. [PMID: 29847129 PMCID: PMC6150689 DOI: 10.1021/acs.jpcb.8b03528] [Citation(s) in RCA: 58] [Impact Index Per Article: 9.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Spiropyrans undergo Cspiro-O bond breaking to their ring-open protonated E-merocyanine form upon protonation and irradiation via an intermediate protonated Z-merocyanine isomer. We show that the extent of acid-induced ring opening is controlled by matching both the concentration and strength of the acid used and with strong acids full ring opening to the Z-merocyanine isomer occurs spontaneously allowing its characterization by 1H NMR spectroscopy as well as UV/vis spectroscopy, and reversible switching between Z/ E-isomerization by irradiation with UV and visible light. Under sufficiently acidic conditions, both E- and Z-isomers are thermally stable. Judicious choice of acid such that its p Ka lies between that of the E- and Z-merocyanine forms enables thermally stable switching between spiropyran and E-merocyanine forms and hence pH gating between thermally irreversible and reversible photochromic switching.
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Affiliation(s)
- L Kortekaas
- Molecular Inorganic Chemistry, Stratingh Institute for Chemistry, Faculty of Mathematics and Natural Sciences , University of Groningen , Nijenborgh 4 , 9747AG Groningen , The Netherlands
| | - J Chen
- Molecular Inorganic Chemistry, Stratingh Institute for Chemistry, Faculty of Mathematics and Natural Sciences , University of Groningen , Nijenborgh 4 , 9747AG Groningen , The Netherlands
| | - D Jacquemin
- Chimie Et Interdisciplinarité, Synthèse, Analyse, Modélisation (CEISAM) , UMR CNRS no. 6230, Université de Nantes , BP 92208, 2, Rue de la Houssinière , 44322 Nantes Cedex 3, France
| | - W R Browne
- Molecular Inorganic Chemistry, Stratingh Institute for Chemistry, Faculty of Mathematics and Natural Sciences , University of Groningen , Nijenborgh 4 , 9747AG Groningen , The Netherlands
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8
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Jones CD, Steed JW. Gels with sense: supramolecular materials that respond to heat, light and sound. Chem Soc Rev 2018; 45:6546-6596. [PMID: 27711667 DOI: 10.1039/c6cs00435k] [Citation(s) in RCA: 310] [Impact Index Per Article: 51.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
Advances in the field of supramolecular chemistry have made it possible, in many situations, to reliably engineer soft materials to address a specific technological problem. Particularly exciting are "smart" gels that undergo reversible physical changes on exposure to remote, non-invasive environmental stimuli. This review explores the development of gels which are transformed by heat, light and ultrasound, as well as other mechanical inputs, applied voltages and magnetic fields. Focusing on small-molecule gelators, but with reference to organic polymers and metal-organic systems, we examine how the structures of gelator assemblies influence the physical and chemical mechanisms leading to thermo-, photo- and mechano-switchable behaviour. In addition, we evaluate how the unique and versatile properties of smart materials may be exploited in a wide range of applications, including catalysis, crystal growth, ion sensing, drug delivery, data storage and biomaterial replacement.
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Affiliation(s)
| | - Jonathan W Steed
- Department of Chemistry, Durham University, South Road, DH1 3LE, UK.
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10
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11
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Ran X, Gao Q, Zhang Y, Guo L. Colorimetry and phase transition characteristics in sensing fluoride anion based on hydrazide organogelators. RSC Adv 2017. [DOI: 10.1039/c7ra11650k] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023] Open
Abstract
Colorimetry and phase transition characteristics in sensing fluoride anions have been achieved based on hydrazide organogelators.
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Affiliation(s)
- Xia Ran
- Institute of Micro/Nano Photonic Materials and Applications
- Henan University
- Kaifeng 475004
- People's Republic of China
| | - Qiongqiong Gao
- Institute of Micro/Nano Photonic Materials and Applications
- Henan University
- Kaifeng 475004
- People's Republic of China
| | - Yu Zhang
- Institute of Plant Stress Biology
- Henan University
- Kaifeng 475004
- People's Republic of China
| | - Lijun Guo
- Institute of Micro/Nano Photonic Materials and Applications
- Henan University
- Kaifeng 475004
- People's Republic of China
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12
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Hooper AE, Kennedy SR, Jones CD, Steed JW. Gelation by supramolecular dimerization of mono(urea)s. Chem Commun (Camb) 2016; 52:198-201. [DOI: 10.1039/c5cc06995e] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Mono-ureido salicylic acid derivatives form hydrogen bonded dimers that mimic the gelation behaviour of covalently linked bis(urea)s.
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13
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Cayuela A, Kennedy SR, Soriano ML, Jones CD, Valcárcel M, Steed JW. Fluorescent carbon dot-molecular salt hydrogels. Chem Sci 2015; 6:6139-6146. [PMID: 30090229 PMCID: PMC6055089 DOI: 10.1039/c5sc01859e] [Citation(s) in RCA: 78] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2015] [Accepted: 07/29/2015] [Indexed: 11/21/2022] Open
Abstract
We report the incorporation of functionalised carbon nanodots within a low molecular weight salt hydrogel enhancing the gelation and fluorescence properties of both the gel and carbon nanomaterial.
The incorporation of functionalised carbon nanodots within a novel low molecular weight salt hydrogel derived from 5-aminosalicylic acid is reported. The carbon dots result in markedly enhanced gelation properties, while inclusion within the hydrophobic gel results in a dramatic fluorescence enhancement for the carbon nanomaterials. The resulting hybrid CD gels exhibit a useful sensor response for heavy metal ions, particularly Pb2+.
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Affiliation(s)
- Angelina Cayuela
- Department of Analytical Chemistry , Marie Curie Building , Campus de Rabanales , University of Córdoba , E-14071 Córdoba , Spain . ; Tel: +34 957 218616
| | - Stuart R Kennedy
- Department of Chemistry , University of Durham , South Road , DH1 3LE , UK . ; ; Tel: +44 (0)191 334 2085
| | - M Laura Soriano
- Department of Analytical Chemistry , Marie Curie Building , Campus de Rabanales , University of Córdoba , E-14071 Córdoba , Spain . ; Tel: +34 957 218616
| | - Christopher D Jones
- Department of Chemistry , University of Durham , South Road , DH1 3LE , UK . ; ; Tel: +44 (0)191 334 2085
| | - Miguel Valcárcel
- Department of Analytical Chemistry , Marie Curie Building , Campus de Rabanales , University of Córdoba , E-14071 Córdoba , Spain . ; Tel: +34 957 218616
| | - Jonathan W Steed
- Department of Chemistry , University of Durham , South Road , DH1 3LE , UK . ; ; Tel: +44 (0)191 334 2085
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14
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Miki K, Hashimoto H, Inoue T, Matsuoka H, Harada H, Hiraoka M, Ohe K. Sonication-induced formation of size-controlled self-assemblies of amphiphilic Janus-type polymers as optical tumor-imaging agents. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2014; 10:3119-3130. [PMID: 24729486 DOI: 10.1002/smll.201400358] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/10/2014] [Revised: 03/14/2014] [Indexed: 06/03/2023]
Abstract
In this study, amphiphilic Janus-type polymers were synthesized via ring-opening metathesis polymerization (ROMP), multiple vicinal diol formation, and grafting of poly(ethylene glycol) monomethyl ether (mPEG). These amphiphilic polymers formed self-assemblies, which were a mixture of micelles and multimicellar aggregates, in water. By choosing suitable Janus-type polymers and irradiating an aqueous solution of polymers using a sonicator, either small micelles or large multimicellar aggregates were obtained selectively. Hydrophobic substituents controlled the aggregation-disaggregation behavior, leading to the formation of metastable self-assemblies by sonication. The formation of self-assemblies with a uniform size was affected by ultrasonic frequency, rather than power. In vivo optical tumor imaging revealed that the large-size multimicellar aggregates persisting for a long time in blood circulation slowly accumulated in tumor tissues. In contrast, the tumor site was rapidly, clearly visualized using the small-size micelles.
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Affiliation(s)
- Koji Miki
- Department of Energy and Hydrocarbon Chemistry, Graduate School of Engineering, Kyoto University, Nishikyo-ku, Kyoto, 615-8510, Japan
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15
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Zhou T, Yu H, Liu M, Yang YW. Carboxylatopillarene-Modified Reduced Graphene Oxides with High Water Dispersibility for Fluorescent Dye Sensing. CHINESE J CHEM 2014. [DOI: 10.1002/cjoc.201400238] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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16
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Shimazu H, Yamanaka M. Solvent-Modulated Self-Assembly ofC3-Symmetric Tris-Urea into a Discrete Dimer and Supramolecular Gel. ASIAN J ORG CHEM 2014. [DOI: 10.1002/ajoc.201402079] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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17
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Yu X, Chen L, Zhang M, Yi T. Low-molecular-mass gels responding to ultrasound and mechanical stress: towards self-healing materials. Chem Soc Rev 2014; 43:5346-71. [DOI: 10.1039/c4cs00066h] [Citation(s) in RCA: 383] [Impact Index Per Article: 38.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
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18
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Basu A, Das G. A C3v-Symmetric Tripodal Urea Receptor for Anions and Ion Pairs: Formation of Dimeric Capsular Assemblies of the Receptor during Anion and Ion Pair Coordination. J Org Chem 2014; 79:2647-56. [DOI: 10.1021/jo500102e] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Affiliation(s)
- Arghya Basu
- Department
of Chemistry, Indian Institute of Technology, Guwahati, Assam 781039, India
| | - Gopal Das
- Department
of Chemistry, Indian Institute of Technology, Guwahati, Assam 781039, India
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19
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James SJ, Perrin A, Jones CD, Yufit DS, Steed JW. Highly interlocked anion-bridged supramolecular networks from interrupted imidazole–urea gels. Chem Commun (Camb) 2014; 50:12851-4. [DOI: 10.1039/c4cc05789a] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Hydrogels from a combination of imidazole and urea hydrogen bonding interactions are turned off by metal complexation and anion binding.
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Affiliation(s)
| | - Andrea Perrin
- Department of Chemistry
- Durham University
- Durham DH1 3LE, UK
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20
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Ni M, Hu XY, Jiang J, Wang L. The self-complexation of mono-urea-functionalized pillar[5]arenes with abnormal urea behaviors. Chem Commun (Camb) 2014; 50:1317-9. [DOI: 10.1039/c3cc47823h] [Citation(s) in RCA: 43] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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21
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Afrasiabi R, Kraatz H. Stimuli‐Responsive Supramolecular Gelation in Ferrocene–Peptide Conjugates. Chemistry 2013; 19:17296-300. [DOI: 10.1002/chem.201302450] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2013] [Indexed: 12/11/2022]
Affiliation(s)
- Rouzbeh Afrasiabi
- Department of Physical and Environmental Sciences, University of Toronto at Scarborough, 1265 Military Trail, Toronto, M1C 1A4 (Canada)
- Department of Chemistry, University of Toronto, 80 St. George Street, Toronto, Ontario M5S 3H6 (Canada), Fax: (+1) 416‐287‐7279
| | - Heinz‐Bernhard Kraatz
- Department of Physical and Environmental Sciences, University of Toronto at Scarborough, 1265 Military Trail, Toronto, M1C 1A4 (Canada)
- Department of Chemistry, University of Toronto, 80 St. George Street, Toronto, Ontario M5S 3H6 (Canada), Fax: (+1) 416‐287‐7279
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22
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Dinda M, Chakraborty S, Samanta S, Bhatt C, Maiti S, Roy S, Kadam Y, Ghosh PK. Solar photothermochemical reaction and supercritical CO2 work up for a fully green process of preparation of pure p-nitrobenzyl bromide. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2013; 47:10535-10540. [PMID: 23930913 DOI: 10.1021/es4019282] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
It has been reported by us recently that p-nitrobenzyl bromide (PNBBr) can be synthesized from p-nitrotoluene (PNT) in high isolated yield with respect to available bromine in 2:1 Br(-)-BrO3(-) employed as brominating reagent. The reaction was conducted in ethylene dichloride (EDC) and the substrate was taken in excess to suppress dibromo impurity formation. The product was "cold crystallized" from the reaction mass and the mother liquor was recycled in the subsequent batch thereby eliminating organic discharge. The present work attempts to further advance the synthesis of this commercially important molecule employed in protection-deprotection strategies. Herein its successful synthesis employing neat substrate and solar radiation as the sole energy source to drive this photothermochemical reaction is reported. Further, 100% pure PNBBr could be isolated from the solid reaction mass in 87% yield by leaching out the excess substrate through supercritical CO2 (Sc-CO2) extraction. The reaction was therefore accomplished cleanly in all respects and with low carbon footprint.
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Affiliation(s)
- Milan Dinda
- AcSIR-CSMCRI , G. B. Marg,Bhavnagar 364002, Gujarat, India
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Malicka JM, Sandeep A, Monti F, Bandini E, Gazzano M, Ranjith C, Praveen VK, Ajayaghosh A, Armaroli N. Ultrasound Stimulated Nucleation and Growth of a Dye Assembly into Extended Gel Nanostructures. Chemistry 2013; 19:12991-3001. [DOI: 10.1002/chem.201301539] [Citation(s) in RCA: 75] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2013] [Indexed: 01/01/2023]
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Roy N, Buhler E, Lehn JM. The Tris-Urea Motif and Its Incorporation into Polydimethylsiloxane-Based Supramolecular Materials Presenting Self-Healing Features. Chemistry 2013; 19:8814-20. [DOI: 10.1002/chem.201203518] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2012] [Revised: 03/27/2013] [Indexed: 11/10/2022]
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Wu NW, Zhang J, Ciren D, Han Q, Chen LJ, Xu L, Yang HB. Construction of Supramolecular Pyrene-Modified Metallacycles via Coordination-Driven Self-Assembly and Their Spectroscopic Behavior. Organometallics 2013. [DOI: 10.1021/om301108s] [Citation(s) in RCA: 60] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Affiliation(s)
- Nai-Wei Wu
- Shanghai Key Laboratory of Green
Chemistry and Chemical Processes, Department of Chemistry, East China Normal University, 3663 North Zhongshan Road, Shanghai 200062,
People’s Republic of China
| | - Jing Zhang
- Shanghai Key Laboratory of Green
Chemistry and Chemical Processes, Department of Chemistry, East China Normal University, 3663 North Zhongshan Road, Shanghai 200062,
People’s Republic of China
| | - Deji Ciren
- Department of Public Teaching, Tibet Agricultural and Animal Husbandry College, 8 Xueyuan Road, Linzhi,
Tibet 860000, People’s Republic of China
| | - Qing Han
- Shanghai Key Laboratory of Green
Chemistry and Chemical Processes, Department of Chemistry, East China Normal University, 3663 North Zhongshan Road, Shanghai 200062,
People’s Republic of China
| | - Li-Jun Chen
- Shanghai Key Laboratory of Green
Chemistry and Chemical Processes, Department of Chemistry, East China Normal University, 3663 North Zhongshan Road, Shanghai 200062,
People’s Republic of China
| | - Lin Xu
- Shanghai Key Laboratory of Green
Chemistry and Chemical Processes, Department of Chemistry, East China Normal University, 3663 North Zhongshan Road, Shanghai 200062,
People’s Republic of China
| | - Hai-Bo Yang
- Shanghai Key Laboratory of Green
Chemistry and Chemical Processes, Department of Chemistry, East China Normal University, 3663 North Zhongshan Road, Shanghai 200062,
People’s Republic of China
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Jiang B, Chen LJ, Xu L, Liu SY, Yang HB. A series of new star-shaped or branched platinum–acetylide derivatives: synthesis, characterization, and their aggregation behavior. Chem Commun (Camb) 2013; 49:6977-9. [DOI: 10.1039/c3cc42689k] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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