Base de dados : MEDLINE
Pesquisa : D03.383.725.762.925 [Categoria DeCS]
Referências encontradas : 208 [refinar]
Mostrando: 1 .. 10   no formato [Detalhado]

página 1 de 21 ir para página                         

  1 / 208 MEDLINE  
              next record last record
seleciona
para imprimir
Fotocópia
Texto completo
[PMID]:28251706
[Au] Autor:Yen HJ; Tsai CL; Chen SH; Liou GS
[Ad] Endereço:Functional Polymeric Materials Laboratory, Institute of Polymer Science and Engineering, National Taiwan University, 1 Roosevelt Road, 4th Sec., Taipei, 10617, Taiwan.
[Ti] Título:Electrochromism and Nonvolatile Memory Device Derived from Triphenylamine-Based Polyimides with Pendant Viologen Units.
[So] Source:Macromol Rapid Commun;38(9), 2017 May.
[Is] ISSN:1521-3927
[Cp] País de publicação:Germany
[La] Idioma:eng
[Ab] Resumo:Three novel solution-processable polyimides containing triphenylamine and pendant viologen moieties are prepared from the newly synthesized diamine and three commercially available dianhydrides. The thermally stable polyimide with strong donor-acceptor charge-transfer possesses write-once read-many-times memory behavior with excellent operation stability. The obtained multicolored electrochromic polymer films reveal ambipolar electrochemical behavior with high optical transmittance contrast of coloration changed from transmissive neutral state to the cyan/magenta/yellow redox states, implying great potential for application in smart window and displays.
[Mh] Termos MeSH primário: Aminas/química
Computadores Moleculares/normas
Polímeros/química
Viologênios/química
[Mh] Termos MeSH secundário: Oxirredução
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Amines); 0 (Polymers); 0 (Viologens)
[Em] Mês de entrada:1711
[Cu] Atualização por classe:171109
[Lr] Data última revisão:
171109
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170303
[St] Status:MEDLINE
[do] DOI:10.1002/marc.201600715


  2 / 208 MEDLINE  
              first record previous record next record last record
seleciona
para imprimir
Fotocópia
Texto completo
[PMID]:26909445
[Au] Autor:Dale EJ; Ferris DP; Vermeulen NA; Henkelis JJ; Popovs I; Jurícek M; Barnes JC; Schneebeli ST; Stoddart JF
[Ad] Endereço:Department of Chemistry, Northwestern University , Evanston, Illinois 60208, United States.
[Ti] Título:Cooperative Reactivity in an Extended-Viologen-Based Cyclophane.
[So] Source:J Am Chem Soc;138(11):3667-70, 2016 Mar 23.
[Is] ISSN:1520-5126
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:A tetracationic pyridinium-based cyclophane with a box-like geometry, incorporating two juxtaposed alkyne functions, has been synthesized. The triple bonds are reactive through cycloadditions toward dienes and azides, promoted by the electron-withdrawing nature of the pyridinium rings, as well as by the strain inherent in the cyclophane. The cycloadditions proceeded in high yields, with the cyclophane reacting faster than its acyclic analogue. While the cyclophane contains two reactive triple bonds, there is no evidence for a stable monofunctional intermediate-only starting material and the difunctional product have been detected by (1)H NMR spectroscopy. Molecular modeling of the energy landscape reveals a lower barrier for the kinetically favored second cycloaddition compared with the first one. This situation results in tandem cascading reactions within rigid cyclophanes, where reactions at a first triple bond induce increased reactivity at a distal second alkyne.
[Mh] Termos MeSH primário: Alquinos/química
Derivados de Benzeno/química
Compostos de Piridínio/química
Viologênios/química
[Mh] Termos MeSH secundário: Adamantano/química
Alquinos/síntese química
Azidas/química
Derivados de Benzeno/síntese química
Reação de Cicloadição
Ciclopentanos/química
Espectroscopia de Ressonância Magnética
Compostos de Piridínio/síntese química
Termodinâmica
Difração de Raios X
[Pt] Tipo de publicação:JOURNAL ARTICLE; RESEARCH SUPPORT, NON-U.S. GOV'T
[Nm] Nome de substância:
0 (Alkynes); 0 (Azides); 0 (Benzene Derivatives); 0 (Cyclopentanes); 0 (Pyridinium Compounds); 0 (Viologens); PJY633525U (Adamantane)
[Em] Mês de entrada:1612
[Cu] Atualização por classe:161230
[Lr] Data última revisão:
161230
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:160225
[St] Status:MEDLINE
[do] DOI:10.1021/jacs.6b01368


  3 / 208 MEDLINE  
              first record previous record next record last record
seleciona
para imprimir
Fotocópia
Texto completo
[PMID]:26616191
[Au] Autor:Kitamoto K; Sakai K
[Ad] Endereço:Department of Chemsitry, Faculty of Science, Kyushu University, Motooka 744, Nishi-ku, Fukuoka 819-0395, Japan. kyo_kitamoto@chem.kyushu-univ.jp ksakai@chem.kyushu-univ.jp and International Institute for Carbon-Neutral Energy Research (WPI-I2CNER), Kyushu University, Motooka 744, Nishi-ku, Fukuoka 819-0395, Japan.
[Ti] Título:Photochemical H2 evolution from water catalyzed by a dichloro(diphenylbipyridine)platinum(ii) derivative tethered to multiple viologen acceptors.
[So] Source:Chem Commun (Camb);52(7):1385-8, 2016 Jan 25.
[Is] ISSN:1364-548X
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:A new single-component photocatalyst for the reduction of water to H2, a dichloro(dpbpy)platinum(ii) derivative (dpbpy = 4,4'-diphenyl-2,2'-bipyridine) tethered to four pendant viologen acceptors (1), is shown to exhibit twice higher photocatalytic efficiency than the previously reported dichloro(bpy)-platinum(ii) analog (; bpy = 2,2'-bipyridine), consistent with the higher absorptivity of at the metal-to-ligand charge transfer ((1)MLCT) band due to the larger π-conjugation in dpbpy relative to bpy.
[Mh] Termos MeSH primário: Hidrogênio/química
Compostos Organoplatínicos/química
Fotoquímica
Viologênios/química
Água/química
[Mh] Termos MeSH secundário: Catálise
[Pt] Tipo de publicação:JOURNAL ARTICLE; RESEARCH SUPPORT, NON-U.S. GOV'T
[Nm] Nome de substância:
0 (Organoplatinum Compounds); 0 (Viologens); 059QF0KO0R (Water); 15227-42-6 (dichloro(dipyridine)platinum II); 7YNJ3PO35Z (Hydrogen)
[Em] Mês de entrada:1610
[Cu] Atualização por classe:161230
[Lr] Data última revisão:
161230
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:151201
[St] Status:MEDLINE
[do] DOI:10.1039/c5cc08044d


  4 / 208 MEDLINE  
              first record previous record next record last record
seleciona
para imprimir
Fotocópia
Texto completo
[PMID]:26489786
[Au] Autor:Katir N; Brahmi Y; Majoral JP; Bousmina M; El Kadib A
[Ad] Endereço:Euromed Research Center, Engineering Division, Euro-Mediterranean University of Fez (UEMF), Fès-Shore, Route de Sidi Harazem, Fès, Morocco. a.elkadib@ueuromed.org.
[Ti] Título:Ternary cooperative assembly--polymeric condensation of photoactive viologen, phosphonate-terminated dendrimers and crystalline anatase nanoparticles.
[So] Source:Chem Commun (Camb);51(100):17716-9, 2015 Dec 28.
[Is] ISSN:1364-548X
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:Photoactive viologen fragments were covalently embedded within the material framework during the self-assembly and sol-gel polymerisation of phosphonate-terminated dendrimers and soluble titanium-oxo-species. The resulting porous anisotropic phosphonate-bridged-crystalline anatase materials serve as new hosts to disperse and stabilize small gold nanoparticles.
[Mh] Termos MeSH primário: Dendrímeros/química
Nanopartículas Metálicas/química
Organofosfonatos/química
Titânio/química
Viologênios/química
[Mh] Termos MeSH secundário: Ouro/química
Espectroscopia de Ressonância Magnética
Microscopia Eletrônica de Varredura
Microscopia Eletrônica de Transmissão
Polimerização
Porosidade
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Dendrimers); 0 (Organophosphonates); 0 (Viologens); 15FIX9V2JP (titanium dioxide); 7440-57-5 (Gold); D1JT611TNE (Titanium)
[Em] Mês de entrada:1611
[Cu] Atualização por classe:161230
[Lr] Data última revisão:
161230
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:151023
[St] Status:MEDLINE
[do] DOI:10.1039/c5cc07872e


  5 / 208 MEDLINE  
              first record previous record next record last record
seleciona
para imprimir
Fotocópia
[PMID]:26353723
[Au] Autor:Fu YR; Liu J; Chen M; Zorin NA; Qian DJ
[Ti] Título:Preparation of Hydrogenase and Viologen-Functionalized Carbon Nanotube Composites for Electrochemical Oxidation of Hydrogen.
[So] Source:J Nanosci Nanotechnol;15(2):1738-41, 2015 Feb.
[Is] ISSN:1533-4880
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:Bionanocomposites of hydrogenase and viologen-functionalized carbon nanotubes (H2ase/V-MWNTs) were prepared and characterized by using infrared spectra and scanning electron microscope. Cyclic voltammograms revealed two couples of redox waves corresponded to the electron transfer processes of viologens and [4Fe-4S]2+/1+ clusters of hydrogenase. The current intensity was enhanced in the H2 atmosphere, which suggested that the present bio-nanocomposites could be used as heterogeneous bio-catalyst to catalyze reversible reaction between protons and H2.
[Mh] Termos MeSH primário: Eletroforese/métodos
Hidrogênio/química
Hidrogenase/química
Nanocompostos/química
Nanotubos de Carbono/química
Viologênios/química
[Mh] Termos MeSH secundário: Enzimas Imobilizadas/química
Teste de Materiais
Nanocompostos/ultraestrutura
Nanotubos de Carbono/ultraestrutura
Oxirredução
Oxigênio/química
Tamanho da Partícula
Propriedades de Superfície
[Pt] Tipo de publicação:JOURNAL ARTICLE; RESEARCH SUPPORT, NON-U.S. GOV'T
[Nm] Nome de substância:
0 (Enzymes, Immobilized); 0 (Nanotubes, Carbon); 0 (Viologens); 7YNJ3PO35Z (Hydrogen); EC 1.12.7.2 (Hydrogenase); S88TT14065 (Oxygen)
[Em] Mês de entrada:1511
[Cu] Atualização por classe:150910
[Lr] Data última revisão:
150910
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:150911
[St] Status:MEDLINE


  6 / 208 MEDLINE  
              first record previous record next record last record
seleciona
para imprimir
Fotocópia
Texto completo
[PMID]:26208171
[Au] Autor:Sultanova ED; Salnikov VV; Mukhitova RK; Zuev YF; Osin YN; Zakharova LY; Ziganshina AY; Konovalov AI
[Ad] Endereço:Department of Supramolecular Chemistry, A.E. Arbuzov Institute of Organic and Physical Chemistry, Kazan Scientific Center, Russian Academy of Sciences, Arbuzov str. 8, Kazan 420088, Russia. az@iopc.ru.
[Ti] Título:High catalytic activity of palladium nanoparticle clusters supported on a spherical polymer network.
[So] Source:Chem Commun (Camb);51(68):13317-20, 2015 Sep 04.
[Is] ISSN:1364-548X
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:In this communication we report the synthesis of Pd nanoparticle clusters achieved via the assembly of Pd nanoparticles on the surface of a spherical polymer network. The network exhibits flexibility and adapts to the cluster formation. The nanoclusters display high catalytic activity toward p-nitrophenol reduction and the Suzuki-Miyaura coupling reaction.
[Mh] Termos MeSH primário: Calixarenos/química
Catálise
Nanopartículas/química
Poliestirenos/química
Viologênios/química
[Mh] Termos MeSH secundário: Nanopartículas Metálicas
Paládio
[Pt] Tipo de publicação:JOURNAL ARTICLE; RESEARCH SUPPORT, NON-U.S. GOV'T
[Nm] Nome de substância:
0 (Polystyrenes); 0 (Viologens); 130036-26-9 (Calixarenes); 5TWQ1V240M (Palladium)
[Em] Mês de entrada:1605
[Cu] Atualização por classe:150811
[Lr] Data última revisão:
150811
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:150725
[St] Status:MEDLINE
[do] DOI:10.1039/c5cc04686f


  7 / 208 MEDLINE  
              first record previous record next record last record
seleciona
para imprimir
Fotocópia
PubMed Central Texto completo
Texto completo
[PMID]:26193265
[Au] Autor:Drozdz W; Kolodziejski M; Markiewicz G; Jenczak A; Stefankiewicz AR
[Ad] Endereço:Faculty of Chemistry, Adam Mickiewicz University, Umultowska 89b, 61-614 Poznan, Poland. wojtek.dr888@gmail.com.
[Ti] Título:Generation of a Multicomponent Library of Disulfide Donor-Acceptor Architectures Using Dynamic Combinatorial Chemistry.
[So] Source:Int J Mol Sci;16(7):16300-12, 2015 Jul 17.
[Is] ISSN:1422-0067
[Cp] País de publicação:Switzerland
[La] Idioma:eng
[Ab] Resumo:We describe here the generation of new donor-acceptor disulfide architectures obtained in aqueous solution at physiological pH. The application of a dynamic combinatorial chemistry approach allowed us to generate a large number of new disulfide macrocyclic architectures together with a new type of [2]catenanes consisting of four distinct components. Up to fifteen types of structurally-distinct dynamic architectures have been generated through one-pot disulfide exchange reactions between four thiol-functionalized aqueous components. The distribution of disulfide products formed was found to be strongly dependent on the structural features of the thiol components employed. This work not only constitutes a success in the synthesis of topologically- and morphologically-complex targets, but it may also open new horizons for the use of this methodology in the construction of molecular machines.
[Mh] Termos MeSH primário: Técnicas de Química Combinatória/métodos
Dissulfetos/química
Bibliotecas de Moléculas Pequenas
[Mh] Termos MeSH secundário: Cromatografia Líquida de Alta Pressão
Óxido de Deutério/química
Espectroscopia de Prótons por Ressonância Magnética
Espectrometria de Massas por Ionização por Electrospray
Viologênios/química
[Pt] Tipo de publicação:JOURNAL ARTICLE; RESEARCH SUPPORT, NON-U.S. GOV'T
[Nm] Nome de substância:
0 (Disulfides); 0 (Small Molecule Libraries); 0 (Viologens); J65BV539M3 (Deuterium Oxide)
[Em] Mês de entrada:1604
[Cu] Atualização por classe:170220
[Lr] Data última revisão:
170220
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:150721
[St] Status:MEDLINE
[do] DOI:10.3390/ijms160716300


  8 / 208 MEDLINE  
              first record previous record next record last record
seleciona
para imprimir
Fotocópia
Texto completo
[PMID]:26016382
[Au] Autor:Hu WB; Hu WJ; Liu YA; Li JS; Jiang B; Wen K
[Ad] Endereço:†Shanghai Advanced Research Institute, Chinese Academy of Science, Shanghai 201210, China.
[Ti] Título:Negative Cooperativity in the Binding of Imidazolium and Viologen Ions to a Pillar[5]arene-Crown Ether Fused Host.
[So] Source:Org Lett;17(12):2940-3, 2015 Jun 19.
[Is] ISSN:1523-7052
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:A pillar[5]arene-crown ether fused bicyclic host 1 was found to be able to recognize an imidazolium ion G1 by its pillar[5]arene subunit and a viologen ion G2 by its crown ether receptor discriminatively. The simultaneous binding of G1 and G2 by 1 resulted in the formation of a three-component host-guest complex G1⊂1⊃G2. Negative heterotropic cooperative effects were displayed by G1 and G2 in their binding to 1 and were investigated by stepwise bindings of G1 and G2 to 1.
[Mh] Termos MeSH primário: Éteres de Coroa/química
Imidazóis/química
Compostos de Amônio Quaternário/química
Viologênios/química
[Mh] Termos MeSH secundário: Íons/química
Modelos Moleculares
Estrutura Molecular
[Pt] Tipo de publicação:JOURNAL ARTICLE; RESEARCH SUPPORT, NON-U.S. GOV'T
[Nm] Nome de substância:
0 (Crown Ethers); 0 (Imidazoles); 0 (Ions); 0 (Quaternary Ammonium Compounds); 0 (Viologens); 0 (pillar(5)arene)
[Em] Mês de entrada:1510
[Cu] Atualização por classe:150619
[Lr] Data última revisão:
150619
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:150529
[St] Status:MEDLINE
[do] DOI:10.1021/acs.orglett.5b01209


  9 / 208 MEDLINE  
              first record previous record next record last record
seleciona
para imprimir
Fotocópia
Texto completo
[PMID]:26007304
[Au] Autor:Mondal JH; Ahmed S; Ghosh T; Das D
[Ad] Endereço:Department of Chemistry, Indian Institute of Technology Guwahati, Kamrup, Assam 781039, India. ddas@iitg.ernet.in.
[Ti] Título:Reversible deformation-formation of a multistimuli responsive vesicle by a supramolecular peptide amphiphile.
[So] Source:Soft Matter;11(24):4912-20, 2015 Jun 28.
[Is] ISSN:1744-6848
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:A systematic study of the ternary complex formation process for aromatic amino acids using ucurbit[8]uril (CB[8]) and a viologen amphiphile shows that the affinity of the amino acid needs to be higher or in a comparable range to that of CB[8] for the amphiphile in order to form the ternary complex. Based on these observations, a supramolecular peptide amphiphile and its corresponding vesicle are prepared using a peptide containing an azobenzene moiety. The azobenzene group at the N-terminus of the peptide served as the second guest for CB[8]. The vesicles obtained from this peptide amphiphile show response to a number of external triggers. The trans-cis isomerization of the azobenzene group upon irradiation with UV-light of 365 nm leads to the breakdown of the ternary complex and eventually to the disruption of the vesicle. The deformation-reformation of the vesicle can be controlled by illuminating the disrupted solution with light of 420 nm as it facilitates the cis-trans isomerization. Thus, the vesicle showed a controlled and reversible response to UV-light with the ability for manipulation of the formation-deformation of the vesicle by the choice of an appropriate wavelength. The vesicle showed response to a stronger guest (1-adamantylamine) for CB[8], which displaces both the guests from the CB[8] cavity and consequently ruptures the vesicle structure. 2,6-Dihydroxynaphthalene acts as a competitive guest and thereby behaves as another external trigger for replacing the peptide from the CB[8] cavity by self-inclusion to form the ternary complex. Henceforth, it allows retaining the vesicle structure and results in the release of the peptide from the vesicle.
[Mh] Termos MeSH primário: Lipossomos/química
Peptídeos/química
Tensoativos/química
[Mh] Termos MeSH secundário: Compostos Azo/química
Hidrocarbonetos Aromáticos com Pontes/química
Imidazóis/química
Lipossomos/efeitos da radiação
Naftóis/química
Raios Ultravioleta
Viologênios/química
[Pt] Tipo de publicação:JOURNAL ARTICLE; RESEARCH SUPPORT, NON-U.S. GOV'T
[Nm] Nome de substância:
0 (Azo Compounds); 0 (Bridged-Ring Compounds); 0 (Imidazoles); 0 (Liposomes); 0 (Naphthols); 0 (Peptides); 0 (Surface-Active Agents); 0 (Viologens); 0 (cucurbit(8)uril); 2R5017T335 (1,2-dihydroxynaphthalene); F0U1H6UG5C (azobenzene)
[Em] Mês de entrada:1603
[Cu] Atualização por classe:161125
[Lr] Data última revisão:
161125
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:150527
[St] Status:MEDLINE
[do] DOI:10.1039/c5sm00491h


  10 / 208 MEDLINE  
              first record previous record
seleciona
para imprimir
Fotocópia
Texto completo
[PMID]:25872601
[Au] Autor:Wang K; Xing SY; Wang XG; Dou HX
[Ad] Endereço:Tianjin Key Laboratory of Structure and Performance for Functional Molecules, Key Laboratory of Inorganic-Organic Hybrid Functional Material Chemistry, Ministry of Education, College of Chemistry, Tianjin Normal University, Tianjin 300387, P. R. China. hxxywk@mail.tjnu.edu.cn hxxyxsy@mail.tjnu.edu.cn.
[Ti] Título:The effect of terminal groups of viologens on their binding behaviors and thermodynamics upon complexation with sulfonated calixarenes.
[So] Source:Org Biomol Chem;13(19):5432-43, 2015 May 21.
[Is] ISSN:1477-0539
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:The binding modes, inclusion abilities, and thermodynamic parameters for the intermolecular complexation of p-sulfonatocalix[4]arene (SC4A), p-sulfonatocalix[5]arene (SC5A), and p-sulfonatothiacalix[4]arene (STC4A), with methyl viologen (MV(2+)), ethyl viologen (EV(2+)), propyl viologen (PV(2+)), butyl viologen (BV(2+)), and benzyl viologen (BnV(2+)), were systematically investigated by NMR spectroscopy, molecular mechanics calculation, and microcalorimetry in neutral aqueous solutions. The obtained results show that all the sulfonated calixarene hosts can form stable inclusion complexes with viologen guests driven by much favorable enthalpy changes. All the viologen guests are encapsulated into the smaller SC4A cavity in their axial orientation. The larger SC5A cavity can accommodate all the viologen guests at its upper-rim midsection in the latitudinal orientation. The binding modes of more flexible STC4A with the smaller MV(2+) and EV(2+) guests are similar to those of SC5A with the two guests, while the binding modes of STC4A with the larger PV(2+) and BV(2+) guests are similar to those of SC4A with the two guests. The host selectivity for all the investigated viologen guests is the same: SC5A > SC4A > STC4A. The magnitude of the host selectivity is associated with the size of the guest. Moreover, the thermodynamic origin of the host selectivity for these viologen guests can be explained well by host-guest binding modes.
[Mh] Termos MeSH primário: Calixarenos/química
Ácidos Sulfônicos/química
Viologênios/química
[Mh] Termos MeSH secundário: Cinética
Espectroscopia de Prótons por Ressonância Magnética
Termodinâmica
[Pt] Tipo de publicação:JOURNAL ARTICLE; RESEARCH SUPPORT, NON-U.S. GOV'T
[Nm] Nome de substância:
0 (Sulfonic Acids); 0 (Viologens); 130036-26-9 (Calixarenes)
[Em] Mês de entrada:1602
[Cu] Atualização por classe:150507
[Lr] Data última revisão:
150507
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:150416
[St] Status:MEDLINE
[do] DOI:10.1039/c5ob00053j



página 1 de 21 ir para página                         
   


Refinar a pesquisa
  Base de dados : MEDLINE Formulário avançado   

    Pesquisar no campo  
1  
2
3
 
           



Search engine: iAH v2.6 powered by WWWISIS

BIREME/OPAS/OMS - Centro Latino-Americano e do Caribe de Informação em Ciências da Saúde