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Artykuły w czasopismach na temat „Cbpqt4+”

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Autor: Grafiati
Data publikacji: 22 czerwca 2024

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1

Yamamoto, Tohru, Hsian-Rong Tseng, J. Fraser Stoddart, Vincenzo Balzani, Alberto Credi, Filippo Marchioni i Margherita Venturi. "Redox-Induced Ring Shuttling and Evidence for Folded Structures in Long and Flexible Two-Station Rotaxanes". Collection of Czechoslovak Chemical Communications 68, nr 8 (2003): 1488–514. http://dx.doi.org/10.1135/cccc20031488.

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Two dumbbell-shaped components with tetraarylmethane-type stoppers - one hydrophobic and one hydrophilic - and a rod-like section containing a tetrathiafulvalene (TTF) unit and a 1,5-dioxynaphthalene (DNP) moiety as electron-donating units, and their [2]rotaxanes, incorporating the cyclobis(paraquat-p-phenylene) (CBPQT4+) cyclophane as their electron-accepting ring component, have been synthesized, the latter using template-directed protocols. The two amphiphilic [2]rotaxanes, which differ from each other only in the lengths of the polyether chains associated with their hydrophilic stoppers, were designed in order (i) to have them exhibit enhanced amphiphilicities and, by altering the lengths of polyether chains, (ii) to improve the qualities of their Langmuir-Blodgett films, and by removing the phenolic residues, (iii) to increase the oxidative stabilities of these switchable molecules, and so extend the lifetimes of electronic devices fabricated from amphiphilic hysteretic molecular switches of this type. UV-VIS absorption and 1H NMR spectra, as well as electrochemical measurements, show that both [2]rotaxanes exist to all intents and purposes in solution as the translational isomer in which the CBPQT4+ cyclophane surrounds the TTF unit. Evidence has also been obtained for the presence in solution of folded conformations of these [2]rotaxanes. While ox/red stimulation of the TTF unit causes shuttling of the CBPQT4+ cyclophane between the TTF and DNP stations, reduction of CBPQT4+ causes unfolding of the [2]rotaxane molecules.
2

Louisy, Jeremie, François Delattre, Joel Lyskawa, Aurélie Malfait, Catherine E. Maclean, Léna Sambe, Ning Zhu, Graeme Cooke i Patrice Woisel. "Surfactant-mediated control of CBPQT4+–dialkoxynaphthalene complexation". Chemical Communications 47, nr 24 (2011): 6819. http://dx.doi.org/10.1039/c1cc10571j.

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3

Caldwell, Stuart T., Graeme Cooke, Alan Cooper, Margaret Nutley, Gouher Rabani, Vincent Rotello, Brian O. Smith i Patrice Woisel. "Tuneable pseudorotaxane formation between a biotin–avidin bioconjugate and CBPQT4+". Chemical Communications, nr 23 (2008): 2650. http://dx.doi.org/10.1039/b803856b.

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4

Zhang, Long, Yunyan Qiu, Wei-Guang Liu, Hongliang Chen, Dengke Shen, Bo Song, Kang Cai i in. "An electric molecular motor". Nature 613, nr 7943 (11.01.2023): 280–86. http://dx.doi.org/10.1038/s41586-022-05421-6.

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AbstractMacroscopic electric motors continue to have a large impact on almost every aspect of modern society. Consequently, the effort towards developing molecular motors1–3 that can be driven by electricity could not be more timely. Here we describe an electric molecular motor based on a [3]catenane4,5, in which two cyclobis(paraquat-p-phenylene)6 (CBPQT4+) rings are powered by electricity in solution to circumrotate unidirectionally around a 50-membered loop. The constitution of the loop ensures that both rings undergo highly (85%) unidirectional movement under the guidance of a flashing energy ratchet7,8, whereas the interactions between the two rings give rise to a two-dimensional potential energy surface (PES) similar to that shown by FOF1 ATP synthase9. The unidirectionality is powered by an oscillating10 voltage11,12 or external modulation of the redox potential13. Initially, we focused our attention on the homologous [2]catenane, only to find that the kinetic asymmetry was insufficient to support unidirectional movement of the sole ring. Accordingly, we incorporated a second CBPQT4+ ring to provide further symmetry breaking by interactions between the two mobile rings. This demonstration of electrically driven continual circumrotatory motion of two rings around a loop in a [3]catenane is free from the production of waste products and represents an important step towards surface-bound14 electric molecular motors.
5

Cao, Jing, Jia-Bin Guo, Peng-Fei Li i Chuan-Feng Chen. "Complexation between Pentiptycene Derived Bis(crown ether)s and CBPQT4+Salt: Ion-Controlled Switchable Processes and Changeable Role of the CBPQT4+in Host−Guest Systems". Journal of Organic Chemistry 76, nr 6 (18.03.2011): 1644–52. http://dx.doi.org/10.1021/jo102288r.

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6

Nasretdinova, G. R., R. R. Fazleeva, A. V. Yanilkin, A. T. Gubaidullin, E. T. Siraeva, E. E. Mansurova, A. Yu Ziganshina i V. V. Yanilkin. "CYCLOBIS(PARAQUAT-P-PHENYLENE) - MEDIATED ELECTROSYNTHESIS OF SILVER NANOPARTICLES". Электрохимия 59, nr 10 (1.10.2023): 559–78. http://dx.doi.org/10.31857/s0424857023100134.

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Silver nanoparticles (Ag-NP) were obtained in MeCN/0.05 M Bu4NPF6 medium by сyclobis(paraquat-p-phenylene) (CBPQT4+) – mediated reduction of the silver ions generated by anodic oxidation of metallic silver during the electrolysis in an undivided cell. Due to multipoint donor-acceptor interaction CBPQT4+ binds the resulting electron-donor Ag-NP to each other, which leads to their enlargement, aggregation and adsorption. This property of the macrocycle allows to call it a “molecular glue” for NP-Ag. In the absence of stabilizers, aggregated polydisperse Ag-NP of indefinite shape are formed with sizes ranging from 20 to 500 nm. Electrosynthesis in the presence of a stabilizer, polyvinylpyrrolidone (PVP), also leads to the formation of aggregated smaller metal particles of 55 ± 26 nm, which have, in addition to the quasi-spherical shape, the shape of a flat triangle and hexagon. Ag-NP stabilized by PVP are partially bound on the surface of nanocellulose (NC). In the presence of NC, larger Ag-NP with an average size of 97 ± 29 nm are formed, the main shape of which is quasi-spherical; cubic, tetrahedral, and rod-shaped Ag-NP are also formed; the formation of Ag-NP with a flat structure is excluded. The catalytic activity of the obtained particles in the reduction of p-nitrophenol with sodium borohydride is extremely low due to the large size, aggregation, and coating of the NP-Ag surface with the stabilizer PVP and marcocycle.
7

Wang, Wei, Wei Wu i Peifeng Su. "Radical Pairing Interactions and Donor–Acceptor Interactions in Cyclobis(Paraquat-P-Phenylene) Inclusion Complexes". Molecules 28, nr 5 (22.02.2023): 2057. http://dx.doi.org/10.3390/molecules28052057.

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Understanding molecular interactions in mechanically interlocked molecules (MIMs) is challenging because they can be either donor–acceptor interactions or radical pairing interactions, depending on the charge states and multiplicities in the different components of the MIMs. In this work, for the first time, the interactions between cyclobis(paraquat-p-phenylene) (abbreviated as CBPQTn+ (n = 0–4)) and a series of recognition units (RUs) were investigated using the energy decomposition analysis approach (EDA). These RUs include bipyridinium radical cation (BIPY•+), naphthalene-1,8:4,5-bis(dicarboximide) radical anion (NDI•−), their oxidized states (BIPY2+ and NDI), neutral electron-rich tetrathiafulvalene (TTF) and neutral bis-dithiazolyl radical (BTA•). The results of generalized Kohn–Sham energy decomposition analysis (GKS-EDA) reveal that for the CBPQTn+···RU interactions, correlation/dispersion terms always have large contributions, while electrostatic and desolvation terms are sensitive to the variation in charge states in CBPQTn+ and RU. For all the CBPQTn+···RU interactions, desolvation terms always tend to overcome the repulsive electrostatic interactions between the CBPQT cation and RU cation. Electrostatic interaction is important when RU has the negative charge. Moreover, the different physical origins of donor–acceptor interactions and radical pairing interactions are compared and discussed. Compared to donor–acceptor interactions, in radical pairing interactions, the polarization term is always small, while the correlation/dispersion term is important. With regard to donor–acceptor interactions, in some cases, polarization terms could be quite large due to the electron transfer between the CBPQT ring and RU, which responds to the large geometrical relaxation of the whole systems.
8

Yeniad, Bahar, Kanykei Ryskulova, David Fournier, Joël Lyskawa, Graeme Cooke, Patrice Woisel i Richard Hoogenboom. "Complexation of thermoresponsive dialkoxynaphthalene end-functionalized poly(oligoethylene glycol acrylate)s with CBPQT4+in water". Polym. Chem. 7, nr 22 (2016): 3681–90. http://dx.doi.org/10.1039/c6py00303f.

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9

Sambe, Léna, François Stoffelbach, Katarzyna Poltorak, Joël Lyskawa, Aurélie Malfait, Marc Bria, Graeme Cooke i Patrice Woisel. "Elaboration of Thermoresponsive Supramolecular Diblock Copolymers in Water from Complementary CBPQT4+and TTF End-Functionalized Polymers". Macromolecular Rapid Communications 35, nr 4 (21.12.2013): 498–504. http://dx.doi.org/10.1002/marc.201300729.

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10

Bigot, Julien, Marc Bria, Stuart T. Caldwell, Frédéric Cazaux, Alan Cooper, Bernadette Charleux, Graeme Cooke i in. "LCST: a powerful tool to control complexation between a dialkoxynaphthalene-functionalised poly(N-isopropylacrylamide) and CBPQT4+ in water". Chemical Communications, nr 35 (2009): 5266. http://dx.doi.org/10.1039/b910856d.

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11

Chi, Xiaodong, Jinya Tian, Dan Luo, Han-Yuan Gong, Feihe Huang i Jonathan L. Sessler. "“Texas-Sized” Molecular Boxes: From Chemistry to Applications". Molecules 26, nr 9 (21.04.2021): 2426. http://dx.doi.org/10.3390/molecules26092426.

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The design and synthesis of novel macrocyclic host molecules continues to attract attention because such species play important roles in supramolecular chemistry. However, the discovery of new classes of macrocycles presents a considerable challenge due to the need to embody by design effective molecular recognition features, as well as ideally the development of synthetic routes that permit further functionalization. In 2010, we reported a new class of macrocyclic hosts: a set of tetracationic imidazolium macrocycles, which we termed “Texas-sized” molecular boxes (TxSBs) in homage to Stoddart’s classic “blue box” (CBPQT4+). Compared with the rigid blue box, the first generation TxSB displayed considerably greater conformational flexibility and a relatively large central cavity, making it a good host for a variety of electron-rich guests. In this review, we provide a comprehensive summary of TxSB chemistry, detailing our recent progress in the area of anion-responsive supramolecular self-assembly and applications of the underlying chemistry to water purification, information storage, and controlled drug release. Our objective is to provide not only a review of the fundamental findings, but also to outline future research directions where TxSBs and their constructs may have a role to play.
12

Wang, Xiao-Jun, Ling-Bao Xing, Bin Chen, Ying Quan, Chen-Ho Tung i Li-Zhu Wu. "Dual-responsive vesicles formed by an amphiphile containing two tetrathiafulvalene units in aqueous solution". Organic & Biomolecular Chemistry 14, nr 1 (2016): 65–68. http://dx.doi.org/10.1039/c5ob02214b.

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The first example of tetrathiafulvalene (TTF)-based vesicle fabricated in water solution with 1 vol.% tetrahydrofuran that could be prevented by chemical oxidant Fe(ClO4)3 or electron-deficient cyclobis(paraquat-p-phenylene) tetracation cyclophane (CBPQT4+) is described.
13

Sajid, Hasnain, Tariq Mahmood, Muhammad Sohaib, Khurshid Ayub, Adnan Younis, Ali S. Alshomrany i Muhammad Imran. "Solvent efficiency and role of dispersion and electrostatic forces for chiral discrimination of sulfur-containing amino acids by tetra-protonated CBPQT macrocycle". Journal of Molecular Liquids 399 (kwiecień 2024): 124384. http://dx.doi.org/10.1016/j.molliq.2024.124384.

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14

Olea Ulloa, Carolina, Miguel Ponce Vargas, Raul Guajardo Maturana i Alvaro Muñoz-Castro. "Theoretical study of the binding strength and magnetical response properties involved in the formation of the π-donor/π-acceptor [TTF–CBPQT]4+ host–guest system". Polyhedron 54 (kwiecień 2013): 119–22. http://dx.doi.org/10.1016/j.poly.2013.02.022.

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15

Bernier, Gaston. "Mémoire à la Commission parlementaire de la Justice de l’Assemblée nationale du Québec". Documentation et bibliothèques 21, nr 2 (16.01.2019): 73–76. http://dx.doi.org/10.7202/1055498ar.

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Le mémoire présenté par le comité mixte ASTED/CBPQ/ABQ-QLA à la Commission parlementaire de la Justice de l’Assemblée nationale dans le cadre de la discussion du projet de loi sur les droits et les libertés de la personne comprend deux recommandations principales : d’abord que le droit à l’information soit incorporé aux libertés fondamentales comme garantie de l’exercice des autres libertés, puis que la documentation gouvernementale (documents administratifs, rapports d’enquête, arrêtés en conseil) soit considérée comme publique.
16

Julien, Charles-Antoine, i France Bouthillier. "Le catalogue réinventé". Documentation et bibliothèques 54, nr 3 (19.03.2015): 229–39. http://dx.doi.org/10.7202/1029200ar.

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Le catalogue en tant qu’outil de recherche offert au public fut conçu pour faciliter le repérage de ressources documentaires spécifiques à l’aide d’informations précises, telles que le titre et le nom de l’auteur. Or, le catalogue est de moins en moins pertinent aux yeux des chercheurs d’aujourd’hui ayant accès à de multiples outils en ligne plus conviviaux et dynamiques. Quelques bibliothèques tentent de regagner la faveur des chercheurs en réinventant le catalogue traditionnel pour qu’il soit plus visuel, interactif et convivial. Cet article décrit une nouvelle génération de catalogues de bibliothèques accessibles au public afin d’aider les institutions qui voudraient s’en inspirer. Il reprend, en l’enrichissant, le contenu d’une présentation faite au récent Colloque conjoint CBPQ/ASTED, tenu en mai 2008 à Montréal.
17

Nasretdinova, Gulnaz, Rezeda R. Fazleeva, Aleksey Yanilkin, Aidar Gubaidullin, Elina Mansurova, Albina Ziganshina i Vitaliy Yanilkin. "Mediated Electrosynthesis of Nanocomposites of Gold Nanoparticles with Cyclobis(paraquat-p-phenylene)". ECS Journal of Solid State Science and Technology, 11.04.2024. http://dx.doi.org/10.1149/2162-8777/ad3d85.

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Abstract The result of cyclobis(paraquat-p-phenylene) (CBPQT4+) –mediated reduction of gold ions generated by anodic oxidation of metallic gold in MeCN (50% vol.) – H2O/0.05 M Bu4NCl medium in the absence and presence of such stabilizers as cetyltrimethylammonium chloride and polyvinylpyrrolidone is polydisperse aggregated composite nanoparticles with sizes ranging from several nm to 100 nm or more. The resulting AuNP@(CBPQT4+)n nanocomposite is a gold nanoparticle encapsulated in a shell of macrocycle molecules. CBPQT4+ is bound to the surface of the gold nanoparticle by donor-acceptor interactions between the electron-withdrawing viologen units and the electron-donating metal particle. Theoretical calculations suggest that the cavity of the bound macrocycle is not empty, but filled with 10-12 gold atoms. CBPQT4+ presumably forms a monomolecular layer on the metal surface, and its excess amount is involved in the aggregation and sedimentation of the nanocomposites. The encapsulation of AuNPs in the macrocyclic shell is the main reason for the suppression of the metal catalytic activity in the test reaction of p-nitrophenol reduction with sodium borohydride.
18

Ribeiro, Cédric, Michele Cariello, Aurélie Malfait, Marc Bria, David Fournier, Joel Lyskawa, Gaelle Le Fer i in. "Synergistic topological and supramolecular control of Diels‐Alder reactivity based on a tunable self‐complexing hos‐guest molecular switch". Chemistry – A European Journal, 22.11.2023. http://dx.doi.org/10.1002/chem.202302300.

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Compartmentalization and binding‐triggered conformational change regulate many metabolic processes in living matter. Here, we have synergistically combined these two biorelevant processes to tune the Diels‐Alder (DA) reactivity of a synthetic self‐complexing host‐guest molecular switch CBPQT4+‐Fu, consisting of an electron‐rich furan unit covalently attached to the electron‐deficient cyclobis(paraquat‐p‐phenylene) tetrachloride (CBPQT4+, 4Cl‐) host. This design allows CBPQT4+‐Fu to efficiently compartmentalize the furan ring inside its host cavity in water, thereby protecting it from the DA reaction with maleimide. Remarkably, the self‐complexed CBPQT4+‐Fu can undergo a conformational change through intramolecular decomplexation upon the addition of a stronger binding molecular naphthalene derivative as a competitive guest, triggering the DA reaction upon addition of a chemical regulator. Remarkably, connecting the guest onto a thermoresponsive lower critical solution temperature (LCST) copolymer regulator controls the DA reaction on command upon heating and cooling the reaction media beyond and below the cloud point temperature of the copolymer, representing a rare example of decreased reactivity upon increasing temperature. Altogether, this work opens up new avenues towards combined topological and supramolecular control over reactivity in synthetic constructs enabling control over reactivity through molecular regulators or even mild temperature variations.
19

Shi, Kelun, Guohui Jia, Ying Wu, Shilong Zhang i Jiawen Chen. "Dynamic control of circumrotation of a [2]catenane by acid‐base switching". ChemistryOpen, 9.02.2024. http://dx.doi.org/10.1002/open.202300304.

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AbstractDynamic control of the motion in a catenane remains a big challenge as it requires precise design and sophisticated well‐organized structures. This paper reports the design and synthesis of a donor‐acceptor [2]catenane through mechanical interlocking, employing a crown ether featuring two dibenzylammonium salts on its side arms as the host and a cyclobis(paraquat‐p‐phenylene) (CBPQT ⋅ 4PF6) ring as the guest molecule. By addition of external acid or base, the catenane can form self‐complexed or decomplexed compounds to alter the cavity size of the crown ether ring, consequently affecting circumrotation rate of CBPQT ⋅ 4PF6 ring of the catenane. This study offers insights for the design and exploration of artificial molecular machines with intricate cascading responsive mechanisms.
20

Defrançois, Sarah, Vincent Bouad, Patrice Woisel i Joël Lyskawa. "Thermoresponsive catechol end‐functionalized polymers/CBPQT 4+ , 4Cl − supramolecular assembly". Journal of Polymer Science, 4.12.2022. http://dx.doi.org/10.1002/pol.20220572.

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21

Zainal, Nur Hani, Michelle G. Newman i Ryan Y. Hong. "Cross-Cultural and Gender Invariance of Transdiagnostic Processes in the United States and Singapore". Assessment, 20.09.2019, 107319111986983. http://dx.doi.org/10.1177/1073191119869832.

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The Research Domain Criteria define cognitive and emotional processes (e.g., rumination, intolerance of uncertainty, anxiety sensitivity, emotion dysregulation) as key transdiagnostic elements of psychopathology. However, there is currently a dearth of construct equivalence studies on measures of these processes. We thus aimed to validate the latent structures of five transdiagnostic constructs using established and newer measures: two-factor Rumination–Reflection Questionnaire, six-factor Perseverative Cognitions Questionnaire, two-factor Intolerance of Uncertainty Scale, three-factor Anxiety Sensitivity Index–3, two-factor Cognitive and Behavioral Processes Questionnaire (CBPQ). Measurement equivalence was examined across 292 American and 144 Singaporean undergraduates. Cross-cultural confirmatory factor analyses revealed strict invariance for all measures, with interfactor association differences on the Perseverative Cognitions Questionnaire and CBPQ. Across gender, full invariance was found on all measures except the CBPQ. Theoretical and clinical implications are discussed.

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