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Jones C, Kershaw Cook LJ, Slater AG, Yufit DS, Steed JW. Scrolling in Supramolecular Gels: A Designer's Guide. CHEMISTRY OF MATERIALS : A PUBLICATION OF THE AMERICAN CHEMICAL SOCIETY 2024; 36:2799-2809. [PMID: 38558920 PMCID: PMC10976645 DOI: 10.1021/acs.chemmater.3c03013] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/27/2023] [Revised: 02/26/2024] [Accepted: 02/27/2024] [Indexed: 04/04/2024]
Abstract
Gelation by small molecules is a topic of enormous importance in catalysis, nanomaterials, drug delivery, and pharmaceutical crystallization. The mechanism by which gelators self-organize into a fibrous gel network is poorly understood. Herein, we describe the crystal structures and gelation properties of a library of bis(urea) compounds and show, via molecular dynamics simulations, how gelator aggregation progresses from a continuous pattern of supramolecular motifs to a homogeneous fiber network. Our model suggests that lamellae with asymmetric surfaces scroll into uniform unbranched fibrils, while sheets with symmetric surfaces undergo stacking to form crystals. The self-assembly of asymmetric lamellae is associated with specific molecular features, such as the presence of narrow and flexible end groups with high packing densities, and likely represents a general mechanism for the formation of small-molecule gels.
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Affiliation(s)
| | - Laurence J. Kershaw Cook
- Department
of Chemistry and Materials Innovation Factory, University of Liverpool, Crown Street, Liverpool L69 7ZD, U.K.
| | - Anna G. Slater
- Department
of Chemistry and Materials Innovation Factory, University of Liverpool, Crown Street, Liverpool L69 7ZD, U.K.
| | - Dmitry S. Yufit
- Department
of Chemistry, Durham University, Durham DH1 3LE, U.K.
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2
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Manna U, Dutta A, Baskey MK. Zn(II)-Coordination Complex(s) from Chiral Bisamides of L-Phenylalanine: Nanoscale-Based Biological Applications and Metallogelation. Inorg Chem 2023; 62:15777-15789. [PMID: 37695678 DOI: 10.1021/acs.inorgchem.3c02731] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/13/2023]
Abstract
Three 3-pyridyl-containing small organic bisamide molecules attached with innocent L-phenylalanine (PHE) side chain as building blocks and positional isomeric toluoyl terminals (PME, MME, and OME) have rationally been designed and synthesized for developing a new series of ZnII-coordination complexes. One of the unique molecular frameworks, having two hydrogen bond-equipped monodentate metal-coordinating sites and biologically potent chiral PHE moiety, was combined with ZnII halide salts under various conditions to produce the coordination complexes (CC1-CC7), thoroughly characterized by the single-crystal X-ray diffraction (SXRD) technique. Maintaining the similar component ratios of acquired CCs in 1:1 DMSO-water produced low-molecular weight metallogels (LMWGs) of PME/MME as envisaged from a rheology- and crystal engineering-based structural rationale. A structure-property correlation from the basis of PXRD of the bulk and xerogels and SXRD data of the isolated single crystals of reaction products clearly supports the crystal engineering-based design strategy based on which the metallogels are prepared. Hand-ground nanoscale ZnCl2-based coordination complex CC1 of PME was also studied for cytotoxicity (HEK-293 cell line) and anticancer activities (B16-F10 cell line) in the MTT assay.
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Affiliation(s)
- Utsab Manna
- School of Chemical Sciences, Indian Association for the Cultivation of Science (IACS), 2A and 2B, Raja S. C. Mullick Road, Jadavpur, Kolkata, West Bengal 700032, India
| | - Abhishek Dutta
- School of Chemical Sciences, Indian Association for the Cultivation of Science (IACS), 2A and 2B, Raja S. C. Mullick Road, Jadavpur, Kolkata, West Bengal 700032, India
| | - Manoj Kumar Baskey
- School of Chemical Sciences, Indian Association for the Cultivation of Science (IACS), 2A and 2B, Raja S. C. Mullick Road, Jadavpur, Kolkata, West Bengal 700032, India
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3
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Yilmazer S, Schwaller D, Mésini PJ. Beyond Sol-Gel: Molecular Gels with Different Transitions. Gels 2023; 9:gels9040273. [PMID: 37102885 PMCID: PMC10137434 DOI: 10.3390/gels9040273] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2023] [Revised: 03/13/2023] [Accepted: 03/17/2023] [Indexed: 03/29/2023] Open
Abstract
The existence of sol–gel transitions is one of the most manifest properties of molecular gels. These transitions reflect their nature since they correspond to the association or dissociation of low weight molecules through non-covalent interactions to form the network constitutive of the gel. Most described molecular gels undergo only one gel-to-sol transition upon heating, and the reverse sol-to-gel transition upon cooling. It has been long observed that different conditions of formation could lead to gels with different morphologies, and that gels can undergo a transition from gel to crystals. However, more recent publications report molecular gels which exhibit additional transitions, for instance gel-to-gel transitions. This review surveys the molecular gels for which, in addition to sol–gel transitions, transitions of different nature have been reported: gel-to-gel transitions, gel-to-crystal transition, liquid–liquid phase separations, eutectic transformations, and synereses.
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4
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Yang Z, Zhang W, Liu X, Zhao S, Yang Z, Jia X. Chloride Salt of Oligourea Ligand: Synthesis, Crystal Structure, Thermal Analyses, and Chloride Anion Binding Properties. INORG CHEM COMMUN 2023. [DOI: 10.1016/j.inoche.2023.110568] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/06/2023]
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Highly Thermally Resistant Bisamide Gelators as Pharmaceutical Crystallization Media. Gels 2022; 9:gels9010026. [PMID: 36661796 PMCID: PMC9858072 DOI: 10.3390/gels9010026] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2022] [Revised: 12/12/2022] [Accepted: 12/27/2022] [Indexed: 12/31/2022] Open
Abstract
Three simple bisamide derivatives (G1, G2 and G3) with different structural modifications were synthesized with easy synthetic procedures in order to test their gel behaviour. The outcomes showed that hydrogen bonding was essential in gel formation; for this reason, only G1 provided satisfactory gels. The presence of methoxy groups in G2 and the alkyl chains in G3 hindered the hydrogen bonding between N-H and C=O that occurred G1. In addition, G1 provided thermally and mechanical stable gels, as confirmed with Tsol and rheology experiments. The gels of G1 were also responsive under pH stimuli and were employed as a vehicle for drug crystallization, causing a change in polymorphism in the presence of flufenamic acid and therefore providing the most thermodynamically stable form III compared with metastable form IV obtained from solution crystallization.
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Andrews J, Kennedy SR, Yufit DS, McCabe JF, Steed JW. Designer Gelators for the Crystallization of a Salt Active Pharmaceutical Ingredient-Mexiletine Hydrochloride. CRYSTAL GROWTH & DESIGN 2022; 22:6775-6785. [PMID: 36345390 PMCID: PMC9635620 DOI: 10.1021/acs.cgd.2c00925] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/15/2022] [Revised: 10/03/2022] [Indexed: 06/16/2023]
Abstract
We report an approach to obtain drug-mimetic supramolecular gelators, which are capable of stabilizing metastable polymorphs of the pharmaceutical salt mexiletine hydrochloride, a highly polymorphic antiarrhythmic drug. Solution-phase screening led to the discovery of two new solvated solid forms of mexiletine, a type C 1,2,4-trichlorobenzene tetarto-solvate and a type D nitrobenzene solvate. Various metastable forms were crystallized within the gels under conditions which would not have been possible in solution. Despite typically crystallizing concomitantly with form 1, a pure sample of form 3 was crystallized within a gel of ethyl methyl ketone. Various type A channel solvates were crystallized from gels of toluene and ethyl acetate, in which the contents of the channels varied from those of solution-phase forms. Most strikingly, the high-temperature-stable form 2 was crystallized from a gel in 1,2-dibromoethane: the only known route to access this form at room temperature. These results exemplify the powerful stabilizing effect of drug-mimetic supramolecular gels, which can be exploited in pharmaceutical polymorph screens to access highly metastable or difficult-to-nucleate solid forms.
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Affiliation(s)
- Jessica
L. Andrews
- Department
of Chemistry, Durham University, South Road, Durham DH1 3LE, U.K.
| | - Stuart R. Kennedy
- Department
of Chemistry, Durham University, South Road, Durham DH1 3LE, U.K.
| | - Dmitry S. Yufit
- Department
of Chemistry, Durham University, South Road, Durham DH1 3LE, U.K.
| | - James F. McCabe
- Pharmaceutical
Sciences, R&D, AstraZeneca, Charter Way, Silk Road Business Park, Macclesfield SK10 2NA, U.K.
| | - Jonathan W. Steed
- Department
of Chemistry, Durham University, South Road, Durham DH1 3LE, U.K.
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7
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Khan F, Das S. Modified Low Molecular Weight Pure and Engineered Gels: A Review of Strategies towards Their Development. ChemistrySelect 2022. [DOI: 10.1002/slct.202200205] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Affiliation(s)
- Finaz Khan
- Department of Chemistry Amity Institute of Applied Sciences Amity University Kolkata Major Arterial Road, Action Area II, Kadampukur Village, Rajarhat, Newtown West Bengal 700135 India
| | - Susmita Das
- Department of Chemistry Amity Institute of Applied Sciences Amity University Kolkata Major Arterial Road, Action Area II, Kadampukur Village, Rajarhat, Newtown West Bengal 700135 India
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8
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Ghosh S, Ghosh S, Raza R, Ghosh K. Progress of 3-aminopyridine-based amide, urea, imine and azo derivatives in supramolecular gelation. J INDIAN CHEM SOC 2022. [DOI: 10.1016/j.jics.2022.100462] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Smith J, Yufit DS, McCabe JF, Steed JW. The "Magic Linker": Highly Effective Gelation from Sterically Awkward Packing. CRYSTAL GROWTH & DESIGN 2022; 22:1914-1921. [PMID: 35559210 PMCID: PMC9084547 DOI: 10.1021/acs.cgd.1c01470] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/15/2021] [Revised: 01/28/2022] [Indexed: 06/15/2023]
Abstract
Bis(urea)s based on the 4,4'-methylenebis(2,6-diethylphenylene) (4,4'-MDEP) spacer are highly effective low molecular weight gelators, and the first single crystal structure of a bis(urea) based on this spacer is reported. The structure is a conformational isomorph with eight crystallographically independent molecules (Z' = 8) arranged in four tennis-ball type dimers with the 2,6-diethylphenylene units adopting five different conformations in the ratio 4:5:3:2:2. The awkward shape and conformational promiscuity arising from the orientations of the ethyl groups in this system is linked to its gelation behavior. A total of seven 4,4'-MDEP derivatives have been prepared, and six are versatile gelators, confirming the particularly effective nature of the MDEP spacer. Only the nitrophenyl derivative does not form gels, likely because of intramolecular CH···O hydrogen bonding arising from the electron-withdrawing nature of the nitro substituent and hence inhibition of the urea α-tape hydrogen-bonded motif.
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Affiliation(s)
- James
P. Smith
- Department
of Chemistry, Durham University, Durham DH1 3LE, U.K.
| | - Dmitry S. Yufit
- Department
of Chemistry, Durham University, Durham DH1 3LE, U.K.
| | - James F. McCabe
- Pharmaceutical
Sciences, R&D, AstraZeneca, Macclesfield SK10 2NA, U.K.
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10
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Anion-Responsive Fluorescent Supramolecular Gels. Molecules 2022; 27:molecules27041257. [PMID: 35209044 PMCID: PMC8876235 DOI: 10.3390/molecules27041257] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2022] [Revised: 02/07/2022] [Accepted: 02/09/2022] [Indexed: 12/04/2022] Open
Abstract
Three novel bis-urea fluorescent low-molecular-weight gelators (LMWGs) based on the tetraethyl diphenylmethane spacer—namely, L1, L2, and L3, bearing indole, dansyl, and quinoline units as fluorogenic fragments, respectively, are able to form gel in different solvents. L2 and L3 gel in apolar solvents such as chlorobenzene and nitrobenzene. Gelator L1 is able to gel in the polar solvent mixture DMSO/H2O (H2O 15% v/v). This allowed the study of gel formation in the presence of anions as a third component. An interesting anion-dependent gel formation was observed with fluoride and benzoate inhibiting the gelation process and H2PO4−, thus causing a delay of 24 h in the gel formation. The interaction of L1 with the anions in solution was clarified by 1H-NMR titrations and the differences in the cooperativity of the two types of NH H-bond donor groups (one indole NH and two urea NHs) on L1 when binding BzO− or H2PO4− were taken into account to explain the inhibition of the gelation in the presence of BzO−. DFT calculations corroborate this hypothesis and, more importantly, demonstrate considering a trimeric model of the L1 gel that BzO− favours its disruption into monomers inhibiting the gel formation.
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Dawn A, Pajoubpong J, Mesmer A, Mirzamani M, He L, Kumari H. Manipulating Assemblies in Metallosupramolecular Gels, Driven by Isomeric Ligands, Metal Coordination, and Adaptive Binary Gelator Systems. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2022; 38:1705-1715. [PMID: 35078313 DOI: 10.1021/acs.langmuir.1c02738] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
Metallosupramolecular gel (MSG) is a unique combination of metal-ligand coordination chemistry and supramolecular gel chemistry with extraordinary adaptivity and softness. Such materials find broad uses in industry, pharmaceutical and biomedical sectors, and in technology generation among many others. Pyridyl-appended bis(urea) gelator systems have been extensively studied as potential MSG-forming materials in the presence of various metal ions. The previous molecular engineering approaches depicted competitive intermolecular and intramolecular binding modes involving urea and pyridyl groups and further fine-tuned by the presence of various molecular spacers. In those studies, formation of intermolecular hydrogen bonding among urea moieties to form urea tape was found to be the key factor in one-dimensional assembly and gel formation. In the present study, we show how two isomeric pyridyl-appended bis(urea) ligands can be designed appropriately to essentially eliminate the interference of competitive factors, leaving the intermolecular urea assembly practically unaffected even in the presence of metal ions. We found that one of the two ligands (L2) and the mixed ligand (L1 + L2) assemblies formed gel in the presence and absence of various metal ions. A metal ion with a linear coordination geometry significantly strengthened the gels. Moreover, an inherently weak L1 + L2 assembly appears to be more adaptive in accommodating larger metal ions especially with nonlinear coordination geometry preferences. Small-angle neutron scattering and rheological, spectroscopic, and morphological characterizations, collectively, capture a detailed interplay among ligand assembly, metal-ligand coordination, and adaptivity, driven by the pure versus mixed ligand assemblies. The knowledge gathered from the present study would be highly beneficial in engineering the metallosupramolecular polymeric assemblies toward their functional applications.
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Affiliation(s)
- Arnab Dawn
- James L. Winkle College of Pharmacy, University of Cincinnati, 231 Albert Sabin Way, Medical Science Building, Cincinnati, Ohio 45267-0514, United States
| | - Jinnipha Pajoubpong
- James L. Winkle College of Pharmacy, University of Cincinnati, 231 Albert Sabin Way, Medical Science Building, Cincinnati, Ohio 45267-0514, United States
| | - Amira Mesmer
- James L. Winkle College of Pharmacy, University of Cincinnati, 231 Albert Sabin Way, Medical Science Building, Cincinnati, Ohio 45267-0514, United States
| | - Marzieh Mirzamani
- James L. Winkle College of Pharmacy, University of Cincinnati, 231 Albert Sabin Way, Medical Science Building, Cincinnati, Ohio 45267-0514, United States
| | - Lilin He
- Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
| | - Harshita Kumari
- James L. Winkle College of Pharmacy, University of Cincinnati, 231 Albert Sabin Way, Medical Science Building, Cincinnati, Ohio 45267-0514, United States
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12
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Ghosh S, Bhattacharya S, Baildya N, Nath Ghosh N, Ghosh K. Silver‐Ion‐Selective Gelation of Simple Pyridine‐Naphthalimide Conjugates with Multiple Applications: Sensing, Drug Delivery, Dye Adsorption and Ion Conductivity. ChemistrySelect 2021. [DOI: 10.1002/slct.202103218] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Sumit Ghosh
- Department of Chemistry University of Kalyani Kalyani 741235 India
| | | | | | | | - Kumaresh Ghosh
- Department of Chemistry University of Kalyani Kalyani 741235 India
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Sudhakaran Jayabhavan S, Ghosh D, Damodaran KK. Making and Breaking of Gels: Stimuli-Responsive Properties of Bis(Pyridyl- N-oxide Urea) Gelators. Molecules 2021; 26:molecules26216420. [PMID: 34770831 PMCID: PMC8587056 DOI: 10.3390/molecules26216420] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2021] [Revised: 10/20/2021] [Accepted: 10/21/2021] [Indexed: 12/27/2022] Open
Abstract
The structural modification of existing supramolecular architecture is an efficient strategy to design and synthesize supramolecular gels with tunable and predictable properties. In this work, we have modified bis(pyridyl urea) compounds with different linkers, namely hexylene and butylene, to their corresponding bis(pyridyl-N-oxide urea). The gelation properties of both the parent and the modified compounds were studied, and the results indicated that modification of the 3-pyridyl moieties to the corresponding 3-pyridyl-N-oxides induced hydrogelation. The stability of the parent and modified compounds were evaluated by sol-gel transition temperature (Tgel) and rheological measurements, and single-crystal X-ray diffraction was used to analyze the solid-state interactions of the gelators. The morphologies of the dried gels were analyzed by scanning electron microscopy (SEM), which revealed that the structural modification did not induce any prominent effect on the gel morphology. The stimuli-responsive behavior of these gels in the presence of salts in DMSO/water was evaluated by rheological experiments, which indicated that the modified compounds displayed enhanced gel strength in most cases. However, the gel network collapsed in the presence of the chloride salts of aluminum(III), zinc(II), copper(II), and cadmium(II). The mechanical strength of the parent gels decreased in the presence of salts, indicating that the structural modification resulted in robust gels in most cases. The modified compounds formed gels below minimum gel concentration in the presence of various salts, indicating salt-induced gelation. These results show the making and breaking ability of the gel network in the presence of external stimuli (salts), which explains the potential of using LMWGs based on N-oxide moieties as stimuli-responsive materials.
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Genio FAF, Paderes MC. Functional Supramolecular Gels Comprised of Bis‐Urea Compounds and Cosmetic Solvents. ChemistrySelect 2021. [DOI: 10.1002/slct.202102367] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Frances Abygail F. Genio
- Institute of Chemistry University of the Philippines Diliman Quezon City 1101 Philippines
- Natural Sciences Research Institute University of the Philippines Diliman Quezon City 1101 Philippines
| | - Monissa C. Paderes
- Institute of Chemistry University of the Philippines Diliman Quezon City 1101 Philippines
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15
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Panja S, Adams DJ. Stimuli responsive dynamic transformations in supramolecular gels. Chem Soc Rev 2021; 50:5165-5200. [PMID: 33646219 DOI: 10.1039/d0cs01166e] [Citation(s) in RCA: 155] [Impact Index Per Article: 51.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
Supramolecular gels are formed by the self-assembly of small molecules under the influence of various non-covalent interactions. As the interactions are individually weak and reversible, it is possible to perturb the gels easily, which in turn enables fine tuning of their properties. Synthetic supramolecular gels are kinetically trapped and usually do not show time variable changes in material properties after formation. However, such materials potentially become switchable when exposed to external stimuli like temperature, pH, light, enzyme, redox, and chemical analytes resulting in reconfiguration of gel matrix into a different type of network. Such transformations allow gel-to-gel transitions while the changes in the molecular aggregation result in alteration of physical and chemical properties of the gel with time. Here, we discuss various methods that have been used to achieve gel-to-gel transitions by modifying a pre-formed gel material through external perturbation. We also describe methods that allow time-dependent autonomous switching of gels into different networks enabling synthesis of next generation functional materials. Dynamic modification of gels allows construction of an array of supramolecular gels with various properties from a single material which eventually extend the limit of applications of the gels. In some cases, gel-to-gel transitions lead to materials that cannot be accessed directly. Finally, we point out the necessity and possibility of further exploration of the field.
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Affiliation(s)
- Santanu Panja
- School of Chemistry, University of Glasgow, Glasgow, G12 8QQ, UK.
| | - Dave J Adams
- School of Chemistry, University of Glasgow, Glasgow, G12 8QQ, UK.
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16
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Byrne P, Lloyd GO, Steed JW. Guest inclusion by Borromean weave coordination networks. J COORD CHEM 2021. [DOI: 10.1080/00958972.2021.1875132] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
Affiliation(s)
- Peter Byrne
- Department of Chemistry, Durham University, Durham, UK
| | - Gareth O. Lloyd
- School of Chemistry, Joseph Banks Laboratories, University of Lincoln, Lincoln, UK
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17
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Tómasson DA, Ghosh D, Kurup MRP, Mulvee MT, Damodaran KK. Evaluating the role of a urea-like motif in enhancing the thermal and mechanical strength of supramolecular gels. CrystEngComm 2021. [DOI: 10.1039/d0ce01194k] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Enhanced thermal and mechanical strength in semicarbazone gels with a urea-like motif obtained by modifying the hydrogen bonding motif of the hydrazone compound.
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Affiliation(s)
| | - Dipankar Ghosh
- Department of Chemistry
- Science Institute
- University of Iceland
- 107 Reykjavík
- Iceland
| | | | | | - Krishna K. Damodaran
- Department of Chemistry
- Science Institute
- University of Iceland
- 107 Reykjavík
- Iceland
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18
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Ghosh D, Bjornsson R, Damodaran KK. Role of N-Oxide Moieties in Tuning Supramolecular Gel-State Properties. Gels 2020; 6:gels6040041. [PMID: 33233596 PMCID: PMC7709621 DOI: 10.3390/gels6040041] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2020] [Revised: 11/15/2020] [Accepted: 11/17/2020] [Indexed: 12/18/2022] Open
Abstract
The role of specific interactions in the self-assembly process of low molecular weight gelators (LMWGs) was studied by altering the nonbonding interactions responsible for gel formation via structural modification of the gelator/nongelator. This was achieved by modifying pyridyl moieties of bis(pyridyl) urea-based hydrogelator (4–BPU) and the isomer (3–BPU) to pyridyl N–oxide compounds (L1 and L2, respectively). The modification of the functional groups resulted in the tuning of the gelation properties of the parent gelator, which induced/enhanced the gelation properties. The modified compounds displayed better mechanical and thermal stabilities and the introduction of the N–oxide moieties had a prominent effect on the morphologies of the gel network, which was evident from the scanning electron microscopy (SEM) images. The effect of various interactions due to the introduction of N–oxide moieties in the gel network formation was analyzed by comparing the solid-state interactions of the compounds using single crystal X-ray diffraction and computational studies, which were correlated with the enhanced gelation properties. This study shows the importance of specific nonbonding interactions and the spatial arrangement of the functional groups in the supramolecular gel network formation.
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Affiliation(s)
- Dipankar Ghosh
- Department of Chemistry, Science Institute, University of Iceland, Dunhagi 3, 107 Reykjavík, Iceland;
| | - Ragnar Bjornsson
- Department of Inorganic Spectroscopy, Max–Planck–Institut für Chemische Energiekonversion, Campus de Stiftstrasse 34–36, 45470 Mülheim an der Ruhr, Germany;
| | - Krishna K. Damodaran
- Department of Chemistry, Science Institute, University of Iceland, Dunhagi 3, 107 Reykjavík, Iceland;
- Correspondence: ; Fax: +354-552-8911
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19
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Wang D, Chen A, Morris J, Wang G. Stimuli-responsive gelators from carbamoyl sugar derivatives and their responses to metal ions and tetrabutylammonium salts. RSC Adv 2020; 10:40068-40083. [PMID: 35520864 PMCID: PMC9057480 DOI: 10.1039/d0ra07587f] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2020] [Accepted: 10/07/2020] [Indexed: 12/22/2022] Open
Abstract
Carbohydrate-based low molecular weight gelators (LMWGs) are interesting compounds with a variety of applications. In this research, a library of nineteen carbamate derivatives of N-acetyl-d-glucosamine were synthesized and characterized, and several derivatives were found to be effective LMWGs. They formed gels in pump oils as well as mixtures of water with ethanol or water with DMSO. The structures of the carbamoyl chains played an important role in the gelation properties, short chain aliphatic derivatives and phenyl carbamates formed gels in more solvents than certain aromatic and dimeric carbamates. The phenyl carbamate gelator was also selected for the encapsulation of naproxen sodium, and the drug slowly diffused from the gel to the aqueous phase as indicated by UV-vis spectroscopy. In addition, we also found that the p-methoxyl benzyl carbamate derivative showed interesting stimuli-responsive gelation properties in the presence of metal salts and tetrabutylammonium salts. The gels were characterized using optical microscopy, scanning electron microscopy, rheology and other methods. The self-assembling mechanisms of the gelators were studied using 1H NMR spectroscopy. The preparation, characterization, and molecular assembling properties of these compounds are reported. The results obtained from this study are useful for the design of other LMWGs and the sugar derivatives can be explored for different biological applications. The formation of spontaneous ionic gels can be applicable for a plethora of applications including catalysis and environmental remediation.
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Affiliation(s)
- Dan Wang
- Department of Chemistry and Biochemistry, Old Dominion University 4541 Hampton Boulevard Norfolk VA 23529-0126 USA +1 757 683 4628 +1 757 683 3781
| | - Anji Chen
- Department of Chemistry and Biochemistry, Old Dominion University 4541 Hampton Boulevard Norfolk VA 23529-0126 USA +1 757 683 4628 +1 757 683 3781
| | - Joedian Morris
- Department of Chemistry and Biochemistry, Old Dominion University 4541 Hampton Boulevard Norfolk VA 23529-0126 USA +1 757 683 4628 +1 757 683 3781
| | - Guijun Wang
- Department of Chemistry and Biochemistry, Old Dominion University 4541 Hampton Boulevard Norfolk VA 23529-0126 USA +1 757 683 4628 +1 757 683 3781
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20
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Panja S, Mondal S, Ghosh S, Ghosh U, Ghosh K. Effect of Substitution at Amine Functionality of 2,6-Diaminopyridine-Coupled Rhodamine on Metal-Ion Interaction and Self-Assembly. ACS OMEGA 2020; 5:13984-13993. [PMID: 32566865 PMCID: PMC7301565 DOI: 10.1021/acsomega.0c01384] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/27/2020] [Accepted: 05/21/2020] [Indexed: 05/08/2023]
Abstract
2,6-Diaminopyridine-coupled rhodamines 1 and 2 have been synthesized, and the effect of substitution on amine functionality toward metal-ion interactions and self-assembly is thoroughly investigated. Both the compounds effectively recognize different metal ions of biological significance fluorimetrically and colorimetrically with a high degree of selectivity and sensitivities. While compound 1 is sensitive to Fe3+ ions, compound 2 is responsive to both Fe3+ and Al3+ ions in aqueous CH3CN (4/1, v/v; 10 mM tris HCl buffer, pH 6.8). The sensing mechanism involves the metal-ion chelation-induced spirolactam ring opening of the rhodamine scaffold that results in both color and fluorescence changes, while the extent of interactions with the metal ions is truly governed by the chemical structure of the compounds. Both 1 and 2 are proficient in detecting Fe3+ and Al3+ ions in human lung cancer cells (A549). As new findings, unlike 1, compound 2 formed a faint pink gel in the toluene-hexane mixture solvent (1:1, v/v), and the gel state of 2 selectively recognizes Ag+ ions by exhibiting a phase change from gel to purple sol. Experimental findings establish the role of the formamide moiety in forming the self-assembly.
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Affiliation(s)
- Santanu Panja
- Department
of Chemistry, University of Kalyani, Kalyani 741235, India
- School
of Chemistry, University of Glasgow, Glasgow G12 8QQ, U.K.
| | - Subhendu Mondal
- Department
of Chemistry, University of Kalyani, Kalyani 741235, India
| | - Sourav Ghosh
- Department
of Biochemistry and Biophysics, University
of Kalyani, Kalyani 741235, India
| | - Utpal Ghosh
- Department
of Biochemistry and Biophysics, University
of Kalyani, Kalyani 741235, India
| | - Kumaresh Ghosh
- Department
of Chemistry, University of Kalyani, Kalyani 741235, India
- ,
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21
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Ghosh D, Deepa, Damodaran KK. Metal complexation induced supramolecular gels for the detection of cyanide in water. Supramol Chem 2020. [DOI: 10.1080/10610278.2020.1751845] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
Affiliation(s)
- Dipankar Ghosh
- Department of Chemistry, Science Institute, University of Iceland, Reykjavik, Iceland
| | - Deepa
- Department of Chemistry, Science Institute, University of Iceland, Reykjavik, Iceland
| | - Krishna K. Damodaran
- Department of Chemistry, Science Institute, University of Iceland, Reykjavik, Iceland
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22
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Kim HK, Bui TT. Lanthanum(III) Trifluoromethanesulfonate Catalyzed Direct Synthesis of Ureas from N-Benzyloxycarbonyl-, N-Allyloxycarbonyl-, and N-2,2,2-Trichloroethoxycarbonyl-Protected Amines. Synlett 2020. [DOI: 10.1055/s-0040-1707991] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
A novel lanthanum triflate mediated conversion of N-benzyloxycarbonyl-, N-allyloxycarbonyl-, and N-trichloroethoxycarbonyl-protected amines into nonsymmetric ureas was discovered. In this study, lanthanum triflate was found to be an effective catalyst for preparing various nonsymmetric ureas from protected amines. A variety of protected aromatic and aliphatic carbamates reacted readily with various amines in the presence of lanthanum triflate to generate the desired ureas in high yields. This result demonstrated that this novel lanthanum triflate catalyzed preparation of ureas from Cbz, Alloc, and Troc carbamates can be employed for the formation of various urea structures.
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Affiliation(s)
- Hee-Kwon Kim
- Department of Nuclear Medicine, Molecular Imaging and Therapeutic Medicine Research Center, Jeonbuk National University Medical School and Hospital
- Research Institute of Clinical Medicine of Jeonbuk National University-Biomedical Research Institute of Jeonbuk National University Hospital
| | - Tien Tan Bui
- Department of Nuclear Medicine, Molecular Imaging and Therapeutic Medicine Research Center, Jeonbuk National University Medical School and Hospital
- Research Institute of Clinical Medicine of Jeonbuk National University-Biomedical Research Institute of Jeonbuk National University Hospital
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23
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Ghosh D, Mulvee MT, Damodaran KK. Tuning Gel State Properties of Supramolecular Gels by Functional Group Modification. Molecules 2019; 24:E3472. [PMID: 31557821 PMCID: PMC6804314 DOI: 10.3390/molecules24193472] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2019] [Revised: 09/22/2019] [Accepted: 09/24/2019] [Indexed: 12/02/2022] Open
Abstract
The factors affecting the self-assembly process in low molecular weight gelators (LMWGs) were investigated by tuning the gelation properties of a well-known gelator N-(4-pyridyl)isonicotinamide (4PINA). The N-H∙∙∙N interactions responsible for gel formation in 4PINA were disrupted by altering the functional groups of 4PINA, which was achieved by modifying pyridyl moieties of the gelator to pyridyl N-oxides. We synthesized two mono-N-oxides (INO and PNO) and a di-N-oxide (diNO) and the gelation studies revealed selective gelation of diNO in water, but the two mono-N-oxides formed crystals. The mechanical strength and thermal stabilities of the gelators were evaluated by rheology and transition temperature (Tgel) experiments, respectively, and the analysis of the gel strength indicated that diNO formed weak gels compared to 4PINA. The SEM image of diNO xerogels showed fibrous microcrystalline networks compared to the efficient fibrous morphology in 4PINA. Single-crystal X-ray analysis of diNO gelator revealed that a hydrogen-bonded dimer interacts with adjacent dimers via C-H∙∙∙O interactions. The non-gelator with similar dimers interacted via C-H∙∙∙N interaction, which indicates the importance of specific non-bonding interactions in the formation of the gel network. The solvated forms of mono-N-oxides support the fact that these compounds prefer crystalline state rather than gelation due to the increased hydrophilic interactions. The reduced gelation ability (minimum gel concentration (MGC)) and thermal strength of diNO may be attributed to the weak intermolecular C-H∙∙∙O interaction compared to the strong and unidirectional N-H∙∙∙N interactions in 4PINA.
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Affiliation(s)
- Dipankar Ghosh
- Department of Chemistry, Science Institute, University of Iceland, Dunhagi 3, 107 Reykjavík, Iceland.
| | - Matthew T Mulvee
- Department of Chemistry, Durham University, South Road, Durham DH1 3LE, UK.
| | - Krishna K Damodaran
- Department of Chemistry, Science Institute, University of Iceland, Dunhagi 3, 107 Reykjavík, Iceland.
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24
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Guterman T, Levin M, Kolusheva S, Levy D, Noor N, Roichman Y, Gazit E. Real‐Time In‐Situ Monitoring of a Tunable Pentapeptide Gel–Crystal Transition. Angew Chem Int Ed Engl 2019; 58:15869-15875. [DOI: 10.1002/anie.201907971] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2019] [Revised: 08/26/2019] [Indexed: 11/10/2022]
Affiliation(s)
- Tom Guterman
- Department of Molecular Microbiology and Biotechnology George S. Wise Faculty of Life Sciences Tel Aviv University Tel Aviv 6997801 Israel
| | - Maayan Levin
- Raymond and Beverly Sackler School of Chemistry Tel Aviv University Tel Aviv 6997801 Israel
| | - Sofiya Kolusheva
- Ilse Katz Institute for Nanotechnology Ben Gurion University of the Negev Beer Sheva 84105 Israel
| | - Davide Levy
- Wolfson Applied Materials Research Center Tel Aviv University Tel Aviv 6997801 Israel
| | - Nadav Noor
- Department of Molecular Microbiology and Biotechnology George S. Wise Faculty of Life Sciences Tel Aviv University Tel Aviv 6997801 Israel
- Department of Materials Science and Engineering Iby and Aladar Fleischman Faculty of Engineering Tel Aviv University Tel Aviv 6997801 Israel
| | - Yael Roichman
- Raymond and Beverly Sackler School of Chemistry Tel Aviv University Tel Aviv 6997801 Israel
- Raymond and Beverly Sackler School of Physics & Astronomy Tel Aviv University Tel Aviv 6997801 Israel
| | - Ehud Gazit
- Department of Molecular Microbiology and Biotechnology George S. Wise Faculty of Life Sciences Tel Aviv University Tel Aviv 6997801 Israel
- Department of Materials Science and Engineering Iby and Aladar Fleischman Faculty of Engineering Tel Aviv University Tel Aviv 6997801 Israel
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25
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Guterman T, Levin M, Kolusheva S, Levy D, Noor N, Roichman Y, Gazit E. Real‐Time In‐Situ Monitoring of a Tunable Pentapeptide Gel–Crystal Transition. Angew Chem Int Ed Engl 2019. [DOI: 10.1002/ange.201907971] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Affiliation(s)
- Tom Guterman
- Department of Molecular Microbiology and Biotechnology George S. Wise Faculty of Life Sciences Tel Aviv University Tel Aviv 6997801 Israel
| | - Maayan Levin
- Raymond and Beverly Sackler School of Chemistry Tel Aviv University Tel Aviv 6997801 Israel
| | - Sofiya Kolusheva
- Ilse Katz Institute for Nanotechnology Ben Gurion University of the Negev Beer Sheva 84105 Israel
| | - Davide Levy
- Wolfson Applied Materials Research Center Tel Aviv University Tel Aviv 6997801 Israel
| | - Nadav Noor
- Department of Molecular Microbiology and Biotechnology George S. Wise Faculty of Life Sciences Tel Aviv University Tel Aviv 6997801 Israel
- Department of Materials Science and Engineering Iby and Aladar Fleischman Faculty of Engineering Tel Aviv University Tel Aviv 6997801 Israel
| | - Yael Roichman
- Raymond and Beverly Sackler School of Chemistry Tel Aviv University Tel Aviv 6997801 Israel
- Raymond and Beverly Sackler School of Physics & Astronomy Tel Aviv University Tel Aviv 6997801 Israel
| | - Ehud Gazit
- Department of Molecular Microbiology and Biotechnology George S. Wise Faculty of Life Sciences Tel Aviv University Tel Aviv 6997801 Israel
- Department of Materials Science and Engineering Iby and Aladar Fleischman Faculty of Engineering Tel Aviv University Tel Aviv 6997801 Israel
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26
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Pratibha, Shukla M, Kaul G, Chopra S, Verma S. Nucleobase Soft Metallogel Composites with Antifouling Activities against ESKAPE Pathogens. ChemistrySelect 2019. [DOI: 10.1002/slct.201803693] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Pratibha
- Department of ChemistryCenter for Environmental Science and EngineeringIndian Institute of Technology Kanpur Kanpur 208016 (UP) India
| | - Manjulika Shukla
- Division of MicrobiologyCSIR-Central Drug Research Institute, Sector 10, Janakipuram Extension Sitapur Road Lucknow 226031 India
| | - Grace Kaul
- Division of MicrobiologyCSIR-Central Drug Research Institute, Sector 10, Janakipuram Extension Sitapur Road Lucknow 226031 India
| | - Sidharth Chopra
- Division of MicrobiologyCSIR-Central Drug Research Institute, Sector 10, Janakipuram Extension Sitapur Road Lucknow 226031 India
| | - Sandeep Verma
- Department of ChemistryCenter for Environmental Science and EngineeringIndian Institute of Technology Kanpur Kanpur 208016 (UP) India
- DST Thematic Unit of Excellence on Soft NanofabricationIndian Institute of Technology Kanpur, Kanpur Uttar Pradesh 208016 India
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27
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Panja A, Ghosh K. Triazole-amide isosteric pyridine-based supramolecular gelators in metal ion and biothiol sensing with excellent performance in adsorption of heavy metal ions and picric acid from water. NEW J CHEM 2019. [DOI: 10.1039/c8nj04380a] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
Pyridine-based gelators 1–4 of triazole-amide isosteric relationship have been considered in metal ion sensing, heavy metal and picric acid adsorption from water. The change from triazole to isosteric amide has marked effect on gelling properties of the gelators.
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Affiliation(s)
- Atanu Panja
- Department of Chemistry
- University of Kalyani
- Kalyani-741235
- India
| | - Kumaresh Ghosh
- Department of Chemistry
- University of Kalyani
- Kalyani-741235
- India
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28
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Tran VH, Kim HK. CaI 2-Catalyzed direct transformation of N-Alloc-, N-Troc-, and N-Cbz-protected amines to asymmetrical ureas. NEW J CHEM 2019. [DOI: 10.1039/c9nj03111a] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
A practical CaI2-catalyzed direct synthesis of asymmetrical ureas from N-Alloc-, N-Troc-, and N-Cbz-carbamate compounds has been developed.
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Affiliation(s)
- Van Hieu Tran
- Department of Nuclear Medicine
- Molecular Imaging & Therapeutic Medicine Research Center
- Chonbuk National University Medical School and Hospital
- Jeonju
- Republic of Korea
| | - Hee-Kwon Kim
- Department of Nuclear Medicine
- Molecular Imaging & Therapeutic Medicine Research Center
- Chonbuk National University Medical School and Hospital
- Jeonju
- Republic of Korea
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29
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Torres-Moya I, Saikia B, Prieto P, Carrillo JR, Steed JW. High thermal stability, pH responsive organogels of 2H-benzo[d]1,2,3-triazole derivatives as pharmaceutical crystallization media. CrystEngComm 2019. [DOI: 10.1039/c8ce01742e] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
2H-Benzo[d]1,2,3-triazole derivatives give rise to a supergelator that results in the crystallization of kinetic form I sulfathiazole.
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Affiliation(s)
- Iván Torres-Moya
- Department of Chemistry
- Durham University
- Durham
- UK
- Department of Organic Chemistry
| | | | - Pilar Prieto
- Department of Organic Chemistry
- Faculty of Chemical and Technologies Sciences
- University of Castilla La Mancha-IRICA
- 13071 Ciudad Real
- Spain
| | - José R. Carrillo
- Department of Organic Chemistry
- Faculty of Chemical and Technologies Sciences
- University of Castilla La Mancha-IRICA
- 13071 Ciudad Real
- Spain
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30
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Berdiell IC, Kulak AN, Warriner SL, Halcrow MA. Heterometallic Coordination Polymer Gels Supported by 2,4,6-Tris(pyrazol-1-yl)-1,3,5-triazine. ACS OMEGA 2018; 3:18466-18474. [PMID: 31458419 PMCID: PMC6644042 DOI: 10.1021/acsomega.8b02508] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/25/2018] [Accepted: 12/13/2018] [Indexed: 05/04/2023]
Abstract
Complexes of type [M(tpt)2]X2 (M2+ = Fe2+, Co2+, Ni2+; tpt = 2,4,6-tri{pyrazol-1-yl}-1,3,5-triazine; X- = BF4 - or ClO4 -) crystallize in a cubic lattice, with the metal ion and ligand conformation showing unusual symmetry-imposed disorder. Addition of 1 equiv AgX to the corresponding preformed [M(tpt)2]X2 salt in concentrated MeNO2 solution affords thixotropic gels. Gelation was not observed in analogous reactions using [Mn(tpt)2][ClO4]2, or from reactions in other, more donating solvents. Scanning electron microscopy (SEM) images from dilute solutions of the reagents confirmed the fibrous microstructure of the gels and their homogeneous elemental composition. However, energy-dispersive X-ray data show a reduced Fe/Ag ratio compared to the Co/Ag and Ni/Ag gels, where a 1:1 ratio of metals is evident. More concentrated gels decomposed to silver nanoparticles during SEM sample preparation. Mass spectrometry and 1H NMR indicate that silver induces partial ligand displacement reactions in [Fe(tpt)2]2+ and [Co(tpt)2]2+, but not in [Ni(tpt)2]2+. Hence, the strength of the gels, which follows the order M = Mn (no gel) < Fe < Co < Ni, correlates with the stability of octahedral [M(tpt)2]2+ under gelation conditions. Iron(II) complexes of the related ligands 2,4,6-tri{pyrazol-1-yl}pyridine (tpp) and 2,4,6-tri{pyrazol-1-yl}pyrimidine (tpym) did not undergo gelation with silver salts under the above conditions. The unique properties of tpt as a gelator in this work may reflect the crystallographically observed ability of metal-coordinated tpt to chelate to exogenous silver ions, through its pendant pyrazolyl group and triazinyl N donors. In contrast, the pendant azolyl substituents in silver complexes of the nongelators tpp and tpym only bind exogenous silver in monodentate fashion.
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31
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Dasary H, Chand DK. Structural and Dynamic Aspects of Palladium(II)‐Based Self‐Assembled Binuclear Coordination Complexes. Isr J Chem 2018. [DOI: 10.1002/ijch.201800065] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Affiliation(s)
- Hareesha Dasary
- Department of ChemistryIndian Institute of Technology Madras Chennai 600036 India
| | - Dillip Kumar Chand
- Department of ChemistryIndian Institute of Technology Madras Chennai 600036 India
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32
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Kang S, Kim HK. Facile direct synthesis of unsymmetrical ureas from N-Alloc-, N-Cbz-, and N-Boc-protected amines using DABAL-Me3. Tetrahedron 2018. [DOI: 10.1016/j.tet.2018.06.011] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/14/2022]
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33
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Ganguly S, Parveen R, Dastidar P. Rheoreversible Metallogels Derived from Coordination Polymers. Chem Asian J 2018; 13:1474-1484. [PMID: 29582575 DOI: 10.1002/asia.201800274] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2018] [Revised: 03/23/2018] [Indexed: 11/07/2022]
Abstract
A series of mixed-ligand-based CdII /CoII coordination polymers (CPs) that were derived from two bis(pyridyl)-bis(amide) ligands, 4,4'-oxybis(N-(pyridin-3-yl)benzamide) (LP) and 4,4'-oxybis(N-(pyridin-4-yl)benzamide) (LP1), and a variety of dicarboxylates isophthalates, terephthalates, 1,2-carboxytranscinamates, and 1,3- and 1,4-phenylene dicarboxylates were synthesized based on a rationale that they would occlude solvate guests inside their crystal lattice, thereby rendering these CPs suitable as metallogelators. The CPs were characterized by using single-crystal X-ray diffraction, elemental analysis, powder X-ray diffraction (PXRD), FTIR spectroscopy, and thermogravimetric analysis (TGA). Structural analyses revealed that the majority of the CPs were lattice-occluded molecular solids, which provided us with an opportunity to study their gelation behavior. We observed that, out of eight CPs that were tested, seven were able to produce metallogels. A thorough study of the rheological behavior of the metallogels was performed and CPG1, CPG2, CPG4, and CPG5 were found to exhibit rheoreversible behavior, which was further confirmed by rheological experiments. Interestingly, ligand LP was found to form an aqueous gel, which was exploited to produce silver nanoparticles.
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Affiliation(s)
- Sumi Ganguly
- Department of Organic Chemistry, Indian Association for the Cultivation of Science, 2A & 2B Raja Subodh Chandra Mullick Road, Kolktata, 700032, West Bengal, India
| | - Rumana Parveen
- Department of Organic Chemistry, Indian Association for the Cultivation of Science, 2A & 2B Raja Subodh Chandra Mullick Road, Kolktata, 700032, West Bengal, India
| | - Parthasarathi Dastidar
- Department of Organic Chemistry, Indian Association for the Cultivation of Science, 2A & 2B Raja Subodh Chandra Mullick Road, Kolktata, 700032, West Bengal, India
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34
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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: 293] [Impact Index Per Article: 48.8] [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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35
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Kennedy SR, Jones CD, Yufit DS, Nicholson CE, Cooper SJ, Steed JW. Tailored supramolecular gel and microemulsion crystallization strategies – is isoniazid really monomorphic? CrystEngComm 2018. [DOI: 10.1039/c8ce00066b] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
A tailored supramolecular gel and microemulsion crystallization strategy has been applied to isoniazid crystal screening.
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36
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Pangannaya S, Mohan M, Trivedi DR. Colorimetric and fluorometric turn-on sensor for selective detection of fluoride ions: sol–gel transition studies and theoretical insights. NEW J CHEM 2018. [DOI: 10.1039/c8nj00991k] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The sol–gel transition properties of receptor R1 aiding the selective detection of fluoride ions.
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Affiliation(s)
- Srikala Pangannaya
- Supramolecular Chemistry Laboratory
- Department of Chemistry
- National Institute of Technology Karnataka (NITK)
- Surathkal-575025
- India
| | - Makesh Mohan
- Department of Physics
- National Institute of Technology Karnataka (NITK)
- Surathkal-575025
- India
| | - Darshak R. Trivedi
- Supramolecular Chemistry Laboratory
- Department of Chemistry
- National Institute of Technology Karnataka (NITK)
- Surathkal-575025
- India
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37
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Jang HS, Kim HK. Novel Direct Synthesis of Asymmetrical Urea Compounds from Trichloroethyl Carbamates Using Catalytic DBU. B KOREAN CHEM SOC 2017. [DOI: 10.1002/bkcs.11314] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Ho Seong Jang
- Materials Architecturing Research Center; Korea Institute of Science and Technology; Seoul 02792 Republic of Korea
| | - Hee-Kwon Kim
- Department of Nuclear Medicine, Molecular Imaging and Therapeutic Medicine Research Center, Biomedical Research Institute; Chonbuk National University Medical School and Hospital; Jeonju Jeonbuk 561-712 Republic of Korea
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39
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Liang X, Zheng L, Li S, Fan X, Shen S, Hu D. Electrochemical removal of stains from paper cultural relics based on the electrode system of conductive composite hydrogel and PbO 2. Sci Rep 2017; 7:8865. [PMID: 28821778 PMCID: PMC5562847 DOI: 10.1038/s41598-017-08907-w] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2017] [Accepted: 07/19/2017] [Indexed: 11/21/2022] Open
Abstract
Constructing methods for cleaning stains on paper artworks that meet the requirements of preservation of cultural relics are still challenging. In response to this problem, a novel electrochemical cleaning method and the preparation of corresponding electrodes were proposed. For this purpose, the conductive graphene (rGO)/polyacryamide (PAM)/montmorillonite (MMT) composite hydrogel as cathode and PbO2-based material as anode were prepared and characterized. The electrochemical cleaning efficiencies of real sample and mimicking paper artifacts were evaluated, and the effects of the electrochemical cleaning on paper itself were detected. Based on the above experiments, the following results were obtained. The composite hydrogel with attractive mechanical properties is mainly based on the hydrogen bond interactions between PAM chains and MMT. The results of cleaning efficiency revealed that the black mildew stains together with the yellowish foxing stains were almost completely eliminated within 6 min at 8 mA/cm2, and various stains formed by tideline, foxing, organic dyes and drinks could be thoroughly removed at 4 mA/cm2 within 5 min. In addition, the proposed cleaning method has advantages in local selectivity, easy control of cleaning course, and reusability, which represents a potential utility of this approach.
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Affiliation(s)
- Xingtang Liang
- Engineering Research Center of Historical and Cultural Heritage Protection, Ministry of Education, School of Materials Science and Engineering, Shaanxi Normal University, Xi'an, 710062, China
- School of Petroleum and Chemical Engineering, Qinzhou University, Qinzhou, 535000, China
| | - Lizhen Zheng
- Engineering Research Center of Historical and Cultural Heritage Protection, Ministry of Education, School of Materials Science and Engineering, Shaanxi Normal University, Xi'an, 710062, China
| | - Shirong Li
- Engineering Research Center of Historical and Cultural Heritage Protection, Ministry of Education, School of Materials Science and Engineering, Shaanxi Normal University, Xi'an, 710062, China
| | - Xiaoyu Fan
- Engineering Research Center of Historical and Cultural Heritage Protection, Ministry of Education, School of Materials Science and Engineering, Shaanxi Normal University, Xi'an, 710062, China
| | - Shukun Shen
- Engineering Research Center of Historical and Cultural Heritage Protection, Ministry of Education, School of Materials Science and Engineering, Shaanxi Normal University, Xi'an, 710062, China
| | - Daodao Hu
- Engineering Research Center of Historical and Cultural Heritage Protection, Ministry of Education, School of Materials Science and Engineering, Shaanxi Normal University, Xi'an, 710062, China.
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40
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Das D, Biradha K. Metal–organic gels of silver salts with an α,β-unsaturated ketone: the influence of anions and solvents on gelation. Inorg Chem Front 2017. [DOI: 10.1039/c7qi00328e] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
A bis-pyridyl substituted α,β-unsaturated ketone was shown to form MOGs with silver salts having anions BF4, ClO4, CF3SO3 and SF6 in various organic solvents. They have shown selectivity towards adsorbing an anionic dye from a mixture of cationic and anionic dyes.
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Affiliation(s)
- Debarati Das
- Department of Chemistry
- Indian Institute of Technology
- Kharagpur 721302
- India
| | - Kumar Biradha
- Department of Chemistry
- Indian Institute of Technology
- Kharagpur 721302
- India
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41
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Offiler CA, Jones CD, Steed JW. Metal ‘turn-off’, anion ‘turn-on’ gelation cascade in pyridinylmethyl ureas. Chem Commun (Camb) 2017; 53:2024-2027. [DOI: 10.1039/c6cc09126a] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Pyridinylmethyl urea gels are weakened or destroyed by addition of transition metal ions but gelation is recovered by adding bromide giving rise to a gel–sol–gel chemically triggered cascade.
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Affiliation(s)
- Caroline A. Offiler
- Department of Chemistry
- Durham University
- University Science Laboratories
- Durham
- UK
| | | | - Jonathan W. Steed
- Department of Chemistry
- Durham University
- University Science Laboratories
- Durham
- UK
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42
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Adarsh NN, Chakraborty A, Tarrés M, Dey S, Novio F, Chattopadhyay B, Ribas X, Ruiz-Molina D. Ligand and solvent effects in the formation and self-assembly of a metallosupramolecular cage. NEW J CHEM 2017. [DOI: 10.1039/c6nj03456j] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
A metallosupramolecular cage and a one-dimensional coordination polymer have been synthesized and structurally characterized by single crystal X-ray diffraction.
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Affiliation(s)
- N. N. Adarsh
- Department of Organic Chemistry
- Indian Association for the Cultivation of Science
- Jadavpur
- India
- Catalan Institute of Nanoscience and Nanotechnology (ICN2)
| | - Amarnath Chakraborty
- Department of Organic Chemistry
- Indian Association for the Cultivation of Science
- Jadavpur
- India
| | - Màrius Tarrés
- Grup de Química Bioinspirada
- Supramolecular i Catàlisi (QBIS-CAT) Institut de Química Computacional i Catàlisi (IQCC) Universitat de Girona
- Catalonia
- Spain
| | - Surjendu Dey
- Department of Organic Chemistry
- Indian Association for the Cultivation of Science
- Jadavpur
- India
| | - Fernando Novio
- Catalan Institute of Nanoscience and Nanotechnology (ICN2)
- CSIC and The Barcelona Institute of Science and Technology
- 08193 Barcelona
- Spain
| | - Basab Chattopadhyay
- Laboratoire de Chimie des Polymères
- Faculté des Sciences
- Université Libre de Bruxelles CP206/01
- Campus de la Plaine
- Brussels
| | - Xavi Ribas
- Grup de Química Bioinspirada
- Supramolecular i Catàlisi (QBIS-CAT) Institut de Química Computacional i Catàlisi (IQCC) Universitat de Girona
- Catalonia
- Spain
| | - Daniel Ruiz-Molina
- Catalan Institute of Nanoscience and Nanotechnology (ICN2)
- CSIC and The Barcelona Institute of Science and Technology
- 08193 Barcelona
- Spain
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43
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Abstract
The halogen bond occurs when there is evidence of a net attractive interaction between an electrophilic region associated with a halogen atom in a molecular entity and a nucleophilic region in another, or the same, molecular entity. In this fairly extensive review, after a brief history of the interaction, we will provide the reader with a snapshot of where the research on the halogen bond is now, and, perhaps, where it is going. The specific advantages brought up by a design based on the use of the halogen bond will be demonstrated in quite different fields spanning from material sciences to biomolecular recognition and drug design.
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Affiliation(s)
- Gabriella Cavallo
- Laboratory
of Nanostructured Fluorinated Materials (NFMLab), Department of Chemistry,
Materials and Chemical Engineering “Giulio Natta”, Politecnico di Milano, Via L. Mancinelli 7, I-20131 Milano, Italy
| | - Pierangelo Metrangolo
- Laboratory
of Nanostructured Fluorinated Materials (NFMLab), Department of Chemistry,
Materials and Chemical Engineering “Giulio Natta”, Politecnico di Milano, Via L. Mancinelli 7, I-20131 Milano, Italy
- VTT-Technical
Research Centre of Finland, Biologinkuja 7, 02150 Espoo, Finland
| | - Roberto Milani
- VTT-Technical
Research Centre of Finland, Biologinkuja 7, 02150 Espoo, Finland
| | - Tullio Pilati
- Laboratory
of Nanostructured Fluorinated Materials (NFMLab), Department of Chemistry,
Materials and Chemical Engineering “Giulio Natta”, Politecnico di Milano, Via L. Mancinelli 7, I-20131 Milano, Italy
| | - Arri Priimagi
- Department
of Chemistry and Bioengineering, Tampere
University of Technology, Korkeakoulunkatu 8, FI-33101 Tampere, Finland
| | - Giuseppe Resnati
- Laboratory
of Nanostructured Fluorinated Materials (NFMLab), Department of Chemistry,
Materials and Chemical Engineering “Giulio Natta”, Politecnico di Milano, Via L. Mancinelli 7, I-20131 Milano, Italy
| | - Giancarlo Terraneo
- Laboratory
of Nanostructured Fluorinated Materials (NFMLab), Department of Chemistry,
Materials and Chemical Engineering “Giulio Natta”, Politecnico di Milano, Via L. Mancinelli 7, I-20131 Milano, Italy
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44
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Lee A, Kim HK, Thompson DH. A Facile Method for the Preparation of Unsymmetrical Ureas Utilizing Zirconium(IV) Chloride. B KOREAN CHEM SOC 2016. [DOI: 10.1002/bkcs.10646] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Anna Lee
- Department of Chemistry; Myongji University; Yongin 449-728 Republic of Korea
| | - Hee-Kwon Kim
- Department of Nuclear Medicine; Molecular Imaging and Therapeutic Medicine Research Center, Biomedical Research Institute, Chonbuk National University Medical School and Hospital; Jeonju 561-712 Republic of Korea
- Department of Chemistry; Purdue University; West Lafayette IN 47907 USA
| | - David H. Thompson
- Department of Chemistry; Purdue University; West Lafayette IN 47907 USA
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45
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Jeong BH, Kim HK, Thompson DH. A Facile and Efficient Method for the Formation of Unsymmetrical Ureas Using DABAL-Me3. Aust J Chem 2016. [DOI: 10.1071/ch15675] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Abstract
A practical synthetic method for the formation of unsymmetrical-substituted ureas is described. The synthesis of the unsymmetrical ureas was readily performed from 2,2,2-trichloroethyl carbamate compounds by treatment of amines with bis(trimethylaluminum)-1,4-diazabicyclo[2.2.2]octane (DABAL-Me3). Using this reaction protocol, various trisubstituted and tetrasubstituted ureas were synthesized in high yields. This study offers a promising approach for the facile synthesis of a variety of unsymmetrical ureas from 2,2,2-trichloroethyl carbamates.
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46
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Banerjee K, Biradha K. Two-dimensional coordination polymers and metal–organic gels of symmetrical and unsymmetrical dipyridyl β-diketones: luminescence, dye absorption and mechanical properties. NEW J CHEM 2016. [DOI: 10.1039/c5nj02193f] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The ligands containing chelating as well as exodentate functional groups were shown to form functional coordination polymers and heterometallic gels.
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Affiliation(s)
- Kaustuv Banerjee
- Department of Chemistry
- Indian Institute of Technology
- Kharagpur-721302
- India
| | - Kumar Biradha
- Department of Chemistry
- Indian Institute of Technology
- Kharagpur-721302
- India
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47
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Abstract
Glyme coordinates to copper–thiolate polymers to significantly strengthen materials and provide tunable optical and mechanical properties.
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Affiliation(s)
- W. Scott Compel
- Department of Chemistry
- Colorado State University
- Fort Collins
- USA
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48
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Suresh VM, De A, Maji TK. High aspect ratio, processable coordination polymer gel nanotubes based on an AIE-active LMWG with tunable emission. Chem Commun (Camb) 2015; 51:14678-81. [PMID: 26291066 DOI: 10.1039/c5cc05453b] [Citation(s) in RCA: 42] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
A new TPE based low molecular weight gelator (LMWG) which displays both AIE and MCIE phenomena in gel state has been synthesized. LMWG self-assembles to form 1D nanofibers which undergo morphology transformation to coordination polymer gel (CPG) nanotubes upon metal ion coordination. CPG shows enhanced mechanical stability along with tunable emission properties.
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Affiliation(s)
- Venkata M Suresh
- Molecular Materials Laboratory, Chemistry & Physics of Materials Unit (CPMU), Jawaharlal Nehru Centre for Advanced Scientific Research, Bangalore, India.
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49
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Gilday LC, Robinson SW, Barendt TA, Langton MJ, Mullaney BR, Beer PD. Halogen Bonding in Supramolecular Chemistry. Chem Rev 2015; 115:7118-95. [DOI: 10.1021/cr500674c] [Citation(s) in RCA: 913] [Impact Index Per Article: 101.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
- Lydia C. Gilday
- Chemistry Research Laboratory,
Department of Chemistry, University of Oxford, Mansfield Road, Oxford OX1 3TA, United Kingdom
| | - Sean W. Robinson
- Chemistry Research Laboratory,
Department of Chemistry, University of Oxford, Mansfield Road, Oxford OX1 3TA, United Kingdom
| | - Timothy A. Barendt
- Chemistry Research Laboratory,
Department of Chemistry, University of Oxford, Mansfield Road, Oxford OX1 3TA, United Kingdom
| | - Matthew J. Langton
- Chemistry Research Laboratory,
Department of Chemistry, University of Oxford, Mansfield Road, Oxford OX1 3TA, United Kingdom
| | - Benjamin R. Mullaney
- Chemistry Research Laboratory,
Department of Chemistry, University of Oxford, Mansfield Road, Oxford OX1 3TA, United Kingdom
| | - Paul D. Beer
- Chemistry Research Laboratory,
Department of Chemistry, University of Oxford, Mansfield Road, Oxford OX1 3TA, United Kingdom
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50
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Kartha KK, Praveen VK, Babu SS, Cherumukkil S, Ajayaghosh A. Pyridyl-Amides as a Multimode Self-Assembly Driver for the Design of a Stimuli-Responsive π-Gelator. Chem Asian J 2015; 10:2250-6. [DOI: 10.1002/asia.201500331] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2015] [Indexed: 12/30/2022]
Affiliation(s)
- Kalathil K. Kartha
- Photosciences and Photonics Group, Chemical Sciences and Technology Division; CSIR-National Institute for Interdisciplinary Science and Technology (CSIR-NIIST); Trivandrum 695 019 Kerala India
| | - Vakayil K. Praveen
- Photosciences and Photonics Group, Chemical Sciences and Technology Division; CSIR-National Institute for Interdisciplinary Science and Technology (CSIR-NIIST); Trivandrum 695 019 Kerala India
| | - Sukumaran Santhosh Babu
- Photosciences and Photonics Group, Chemical Sciences and Technology Division; CSIR-National Institute for Interdisciplinary Science and Technology (CSIR-NIIST); Trivandrum 695 019 Kerala India
| | - Sandeep Cherumukkil
- Photosciences and Photonics Group, Chemical Sciences and Technology Division; CSIR-National Institute for Interdisciplinary Science and Technology (CSIR-NIIST); Trivandrum 695 019 Kerala India
- Academy of Scientific and Innovative Research (AcSIR); CSIR-National Institute for Interdisciplinary Science and Technology (CSIR-NIIST); Trivandrum 695 019 Kerala India
| | - Ayyappanpillai Ajayaghosh
- Photosciences and Photonics Group, Chemical Sciences and Technology Division; CSIR-National Institute for Interdisciplinary Science and Technology (CSIR-NIIST); Trivandrum 695 019 Kerala India
- Academy of Scientific and Innovative Research (AcSIR); CSIR-National Institute for Interdisciplinary Science and Technology (CSIR-NIIST); Trivandrum 695 019 Kerala India
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