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https://www.readbyqxmd.com/read/28820940/polyoxometalate-cationic-cluster-and-%C3%AF-%C3%AE-cyclodextrin-from-primary-interactions-to-supramolecular-hybrid-materials
#1
Mhamad Aly Moussawi, Nathalie Leclerc-Laronze, Sébastien Floquet, Pavel A Abramov, Maxim Nailyevich Sokolov, Stephane Cordier, Anne Ponchel, Eric Monflier, Herve Bricout, David Landy, Mohamed Haouas, Jerome Marrot, Emmanuel Cadot
Herein, we report on a three-component supramolecular hybrid system built from specific recognition processes involving a Dawson type polyoxometalate [P2W18O62](6-,) a cationic electron-rich cluster {[Ta6Br12(H6O)6]@2CD}(2+) and γ-cyclodextrin. Investigations of such a class of materials have been conducted using bottom-up approach by studying the specific interactions between -CD and both types of inorganic units. Their ability to interact has been investigated in the solid state by single-crystal X-ray diffraction and in solution using multinuclear NMR methods (including DOSY, EXSY and COSY), ESI-mass and UV-vis spectroscopies, electrochemistry and ITC experiments...
August 18, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28820934/supramolecular-sensors-for-opiates-and-their-metabolites
#2
Elena G Shcherbakova, Ben Zhang, Samer Gozem, Tsuyoshi Minami, Peter Y Zavalij, Mariia Pushina, Lyle Isaacs, Pavel Anzenbacher
The present work develops a sensing approach for opiates using acyclic cucurbituril (aCBs) sensors comprising four glycouril units terminated on both ends with naphthalene fluorophore walls. The connectivity between the glycourils and the naphthalene rings largely defines the opening size of the cucurbituril cavity and its diameter. The large hydrophobic binding cavity is flexible and is able to adapt to guests of various size and topology. The recognition event between the aCBs and guests results in modification of the fluorescence of the terminal walls, a fluorescence response that can be used to sense the drugs of abuse morphine, heroin and oxycodone as well as their metabolites...
August 18, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28819662/chiral-amplification-of-disodium-cromoglycate-chromonics-induced-by-a-codeine-derivative
#3
F Berride, E Troche-Pesqueira, G Feio, E J Cabrita, T Sierra, A Navarro-Vázquez, M M Cid
Chromonic liquid crystals (CLC) are lyotropic phases formed by discotic mesogens in water. Simple chiral dopants such as amino acids have been reported to turn chromonic liquid crystals into their cholesteric counterparts. Here we report a chirality amplification effect in the nematic phase of a 9 wt% disodium cromoglycate (DSCG) lyotropic liquid crystal (LLC) upon doping with a water-soluble codeine derivative. The transition on cooling the isotropic to the nematic phase showed the presence of homochiral spindle-shaped droplets (tactoids)...
August 18, 2017: Soft Matter
https://www.readbyqxmd.com/read/28819460/a-tumor-ph-responsive-supramolecular-photosensitizer-for-activatable-photodynamic-therapy-with-minimal-in-vivo-skin-phototoxicity
#4
Xingshu Li, Bi-Yuan Zheng, Mei-Rong Ke, Yongfan Zhang, Jian-Dong Huang, Juyoung Yoon
A major challenge in photodynamic therapy (PDT) is the development of new tumor-targeting photosensitizers. The tumor-specific activation is considered to be an effective strategy for designing these photosensitizers. Herein, we describe a novel tumor-pH-responsive supramolecular photosensitizer, LDH-ZnPcS8, which is not photoactive under neutral conditions but is precisely and efficiently activated in a slightly acidic environment (pH 6.5). LDH-ZnPcS8 is prepared by using a simple coprecipitation method based on the electrostatic interaction between negatively charged octasulfonate-modified zinc(II) phthalocyanine (ZnPcS8) and cationic hydroxide layers of layered double hydroxide (LDH)...
2017: Theranostics
https://www.readbyqxmd.com/read/28819267/decoding-disease-causing-mechanisms-of-missense-mutations-from-supramolecular-structures
#5
Atsushi Hijikata, Toshiyuki Tsuji, Masafumi Shionyu, Tsuyoshi Shirai
The inheritance modes of pathogenic missense mutations are known to be highly associated with protein structures; recessive mutations are mainly observed in the buried region of protein structures, whereas dominant mutations are significantly enriched in the interfaces of molecular interactions. However, the differences in phenotypic impacts among various dominant mutations observed in individuals are not fully understood. In the present study, the functional effects of pathogenic missense mutations on three-dimensional macromolecular complex structures were explored in terms of dominant mutation types, namely, haploinsufficiency, dominant-negative, or toxic gain-of-function...
August 17, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28818654/water-based-fractionation-of-a-commercial-humic-acid-solid-state-and-colloidal-characterization-of-the-solubility-fractions
#6
Weronika M Swiech, Ian Hamerton, Huang Zeng, David J Watson, Eleonore Mason, Spencer E Taylor
BACKGROUND AND HYPOTHESIS: Humic acid (HA) is of considerable environmental significance, being a major component of soil, as well as being considered for application in other technological areas. However, its structure and colloidal properties continue to be the subject of debate, largely owing to its molecular complexity and association with other humic substances and mineral matter. As a class, HA is considered to comprise supramolecular assemblies of heterogeneous species, and herein we consider a simple route for the separation of some HA sub-fractions...
August 12, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28817635/contractile-actomyosin-arcs-promote-the-activation-of-primary-mouse-t-cells-in-a-ligand-dependent-manner
#7
Jinsung Hong, Sricharan Murugesan, Eric Betzig, John A Hammer
Mechano-transduction is an emerging but still poorly understood component of T cell activation. Here we investigated the ligand-dependent contribution made by contractile actomyosin arcs populating the peripheral supramolecular activation cluster (pSMAC) region of the immunological synapse (IS) to T cell receptor (TCR) microcluster transport and proximal signaling in primary mouse T cells. Using super resolution microscopy, OT1-CD8+ mouse T cells, and two ovalbumin (OVA) peptides with different affinities for the TCR, we show that the generation of organized actomyosin arcs depends on ligand potency and the ability of myosin 2 to contract actin filaments...
2017: PloS One
https://www.readbyqxmd.com/read/28817257/cation-anion-arrangement-patterns-in-self-assembled-pd2l4-and-pd4l8-coordination-cages
#8
Guido H Clever, Philip Punt
Compounds featuring one-dimensional regular arrangements of stacked metal complexes and alternating [cation-anion]∞ sequences have raised considerable interest owing to their peculiar electronic and optical properties as well as guest inclusion capabilities. While traditional ways to realize these structural motifs rely on crystalline compounds, exclusively existing in the solid state, recent progress in the area of metal-mediated supramolecular self-assembly allows for the rational synthesis of structurally well-defined short stretches of stacked metal complexes and cation-anion arrangements...
August 17, 2017: Accounts of Chemical Research
https://www.readbyqxmd.com/read/28817147/supramolecular-core-glycoshell-polythiophene-nanodots-for-targeted-imaging-and-photodynamic-therapy
#9
Hai-Hao Han, Chang-Zheng Wang, Yi Zang, Jia Li, Tony D James, Xiao-Peng He
Supramolecular self-assembly between poly(3-hexylthiophene-2,5-diyl) (P3HT), a polymeric material extensively used for optoelectronic devices, and fluorescent glycoprobes produces core-glycoshell theranostic nanodots (glyco-dots) capable of targeted imaging and photodynamic therapy of liver and triple-negative breast cancer cells.
August 17, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28817145/coherent-electronic-and-nuclear-dynamics-in-a-rhodamine-heterodimer-dna-supramolecular-complex
#10
M Cipolloni, B Fresch, I Occhiuto, P Rukin, K G Komarova, A Cecconello, I Willner, R D Levine, F Remacle, E Collini
Elucidating the role of quantum coherences in energy migration within biological and artificial multichromophoric antenna systems is the subject of an intense debate. It is also a practical matter because of the decisive implications for understanding the biological processes and engineering artificial materials for solar energy harvesting. A supramolecular rhodamine heterodimer on a DNA scaffold was suitably engineered to mimic the basic donor-acceptor unit of light-harvesting antennas. Ultrafast 2D electronic spectroscopic measurements allowed identifying clear features attributable to a coherent superposition of dimer electronic and vibrational states contributing to the coherent electronic charge beating between the donor and the acceptor...
August 17, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28816431/carbon-nanotubes-arranged-as-smart-interfaces-in-lipid-langmuir-blodgett-films-enhancing-the-enzymatic-properties-of-penicillinase-for-biosensing-applications
#11
Fabio Scholl, Paulo Morais, Rayla Gabriel, Michael J Schöning, Jose Roberto Siqueira, Luciano Caseli
In this paper, carbon nanotubes (CNTs) were incorporated in penicillinase-phospholipid Langmuir and Langmuir-Blodgett (LB) films to enhance the enzyme catalytic properties. Adsorption of the penicillinase and CNTs at dimyristoylphosphatidic acid (DMPA) monolayers at the air-water interface was investigated by surface pressure-area isotherms, vibrational spectroscopy and Brewster angle microscopy. The floating monolayers were transferred to solid supports through the LB technique, forming mixed DMPA-CNTs-PEN films, which were investigated by quartz crystal microbalance, vibrational spectroscopy, and atomic force microscopy...
August 17, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28816322/ultrasonication-enhanced-gelation-properties-of-a-versatile-amphiphilic-formamidine-based-gelator-exhibiting-both-organogelation-and-hydrogelation-abilities
#12
Jürgen Bachl, Diego Sampedro, Judith Mayr, David Díaz Díaz
We describe the preparation of a novel amphiphilic gelator built from a formamidine core, which is able to form a variety of physical organogels and hydrogels at concentrations ranging from 15 to 150 mg mL(-1). Interestingly, ultrasound treatment of isotropic solutions (i.e., gel-precursor) resulted in a remarkable enhancement of the gelation kinetics as well as the gelation scope and characteristic gel properties (e.g., critical gelation concentration, gel-to-sol transition temperature, viscoelastic moduli) in comparison to the heating-cooling protocol typically used to obtain supramolecular gels...
August 17, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28816310/role-of-intrinsic-hydrogen-bonds-in-the-assembly-of-perylene-imide-derivatives-in-solution-and-at-the-liquid-solid-interface
#13
Zongxia Guo, Kun Wang, Ping Yu, Shengyue Zhang, Kai Sun, Zhibo Li
The impact of hydrogen bond formation on the supramolecular assembly of two perylene imide derivatives (PMAMI and PDINH) was systematically investigated in solution and at the liquid-solid interface. PDINH has intrinsic hydrogen bond sites, but this is not the case for PMAMI. The solution assembly was explored by morphological methods (SEM, AFM, TEM and cryo-TEM) and spectral characterization (UV-vis, FL, XRD, and FTIR spectra). The surface assembly at the liquid-solid interface was detected by scanning tunneling microscopy (STM)...
August 17, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28816032/high-order-in-a-self-assembled-iridium-iii-complex-gelator-towards-nanostructured-iro2-thin-films
#14
Francesca Scarpelli, Andreea Ionescu, Iolinda Aiello, Massimo La Deda, Alessandra Crispini, Mauro Ghedini, Elvira Brunelli, Settimio Sesti, Nicolas Godbert
The preparation and characterization of a new metallogelator based on the Ir(III) discrete cyclometallated complex [(ppy)2Ir(bpy)](CH3CH2OCH2CO2) are reported, where H(ppy) is 2-phenylpiridine and bpy is 2,2'-bipyridine, used as ancillary ligand. The compound is able to self-assemble in water in a range of concentrations between 3% and 6 % w/w, creating a luminescent ordered supramolecular gel. The gel and xerogel architectures were investigated through POM, SEM and TEM microscopies coupled with Powder X-Ray Diffraction...
August 16, 2017: Chemistry, An Asian Journal
https://www.readbyqxmd.com/read/28815986/modulatory-functionalization-of-gold-nanorods-using-supramolecular-assemblies
#15
Sundo Jeong, Hongrual Park, Dongmin Seon, Jongwan Choi, Ki Bum Hong, Jiseok Lee, Chaekyu Kim, Jung-Keun Kim, Myoung-Hwan Park
Supramolecular assembly-mediated functionalization of gold nanorods (GNRs) has been developed by reversible phase transfer between water and oils, which offers a facile method for fabricating stubborn GNRs with surface charge tunability. In this regard, TMA-GNRs were initially prepared from conventional CTAB-GNRs via a ligand exchange reaction in the presence of excess of TMA ligands. To further expand their functionality and potential applications, electrostatic assemblies of positively charged TMA-GNRs with negatively charged oleate ions were prepared...
August 17, 2017: Chemistry, An Asian Journal
https://www.readbyqxmd.com/read/28815916/compartmentalizing-supramolecular-hydrogels-using-aqueous-multi-phase-systems
#16
Serhii Mytnyk, Alexandre G L Olive, Frank Versluis, Jos M Poolman, Eduardo Mendes, Rienk Eelkema, Jan H van Esch
We present a generic method for compartmentalization of supramolecular hydrogels by using water-in-water emulsions based on aqueous multi-phase systems (AMPS). By forming the low-molecular-weight hydrogel throughout all phases of all-aqueous emulsions, we created distinct, micro-compartmentalized materials. This structuring approach offers control over the composition of each type of the compartments by directing the partitioning of objects to be encapsulated. Moreover, our method allows for barrier-less, dynamic exchange of even large hydrophilic solutes (MW ~ 60 kDa) between separate aqueous compartments...
August 16, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28815793/responsiveness-and-morphology-study-of-dual-stimuli-controlled-supramolecular-polymer
#17
Chenxiao Xiong, Meiran Xie, Ruyi Sun
The synthesis and characterization of a linear supramolecular polymer formed by dual host-guest recognitions is presented. The polymer linked by the orthogonal interactions of azobenzene with β-cyclodextrin and methyl viologen with sulfonatocalix[4]arene is constructed, and the morphology change along with the formation and vanishment of host-guest interaction is investigated. The reversible disassembly-reassembly of the polymer induced by light and the redox process are monitored by UV-vis and cyclic voltammetry, respectively...
August 16, 2017: Macromolecular Rapid Communications
https://www.readbyqxmd.com/read/28815774/excitonically-coupled-states-in-crystalline-coordination-networks
#18
Ritesh Haldar, Antoine Mazel, Reetu Joseph, Michael Adams, Ian Howard, Bryce Richards, Manuel Tsotsalas, Engelbert Redel, Stephane Diring, Fabrice Odobel, Christof Wöll
When chromophores are brought into close proximity, noncovalent interactions (π-π/CH-π) can lead to the formation of excitonically coupled states, which bestow new photophysical properties upon the aggregates. Since the properties of the new states not only depend on the strength of intermolecular interactions, but also on the relative orientation, supramolecular assemblies, where these parameters can be varied in a deliberate fashion, provide novel possibilities for the control of photophysical properties...
August 17, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28814804/a-unique-thermo-induced-gel-to-gel-transition-in-a-ph-sensitive-small-molecule-hydrogel
#19
Hongtao Xie, Mehran Asad Ayoubi, Wensheng Lu, Jide Wang, Jianbin Huang, Wei Wang
For a hydrogel based on a zwitterionic dendritic surfactant, we report an apparently unprecedented reversible temperature-induced gel-to-gel phase transition below the melting point of its alkyl chains, where the supramolecular self-assembly of surfactant molecules underwent a dramatic transformation from low-temperature surfactant bilayers to high-temperature entangled surfactant worm-like micelles.
August 16, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28813482/cysteine-rich-protein-2-accelerates-actin-filament-cluster-formation
#20
Takanori Kihara, Yasunobu Sugimoto, Satoko Shinohara, Shunpei Takaoka, Jun Miyake
Filamentous actin (F-actin) forms many types of structures and dynamically regulates cell morphology and movement, and plays a mechanosensory role for extracellular stimuli. In this study, we determined that the smooth muscle-related transcription factor, cysteine-rich protein 2 (CRP2), regulates the supramolecular networks of F-actin. The structures of CRP2 and F-actin in solution were analyzed by small-angle X-ray solution scattering (SAXS). The general shape of CRP2 was partially unfolded and relatively ellipsoidal in structure, and the apparent cross sectional radius of gyration (Rc) was about 15...
2017: PloS One
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