THREADMILL
THREADed Molecular wIres as supramoLecularly engineered muLtifunctional materials
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THREADMILLTHREADed Molecular wIres as supramoLecularly engineered muLtifunctional materials |
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2. NEWS and upcoming Training Events
We currently have one position open for an energetic and talented Experienced Researcher at University of Catania mainly focused on surface investigation of thin fims of threaded molecular wires by X-ray photoelectron spectroscopy (XPS). (download the full description in pdf)
(go to Jobs page)
The Meeting will focus on new organic materials for photonics and electronics including conjugated oligomers and polymers, molecular materials, transition metal complexes and covering synthetic methodologies, characterization aspects as well as devices. The Meeting will last four days and will be organized in sessions devoted to plenary lecturers, oral and poster communications. |
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We encourage all partners and young researchers to attend.
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ICCOSS meetings have a well established tradition and a few of the past meetings have been held at Jerusalem (1993), Matsuyama (1995), Stony Brook (1997), Cambridge (1999), Mainz (2001), Sydney (2003), Los Angeles (2005), and Merida (2007).
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We encourage all partners and young researchers to attend.
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The First European Cyclodextrin Conference is organized by the newly formed European Cyclodextrin Society and is the first of a biannual conference series. The first conference will be held in Aalborg, Denmark, October 11-13th, 2009 and will deal with all aspects of cyclodextrin science and technology. Researchers within all specialties of cyclodextrin science and technology are invited to contribute to this event.
The aim of this event is to strengthen the collaboration among academia and between academia and industry primarily on a European level.
All contributions are welcome.
Further information can be found here: www.euroCDsoc.com.
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We encourage all partners and young researchers to attend.
Special issue of Advanced Materials 2009:
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We coordinated a special issue of Advanced Materials 2009, vol. 21, issue 10-11 (Wiley-VCH) focussed on "Functional Supramolecular Architectures". Link to the issue
1.1.2009: The Université Louis Pasteur (ULP) of Strasbourg merged with the other two former universities of Strasbourg, i.e. Université Marc Bloch and Université Robert Schuman, into the Université de Strasbourg (UdS). Therefore the ISIS node in Threadmill now belongs to UdS.
Job Opportunities: We have currently 1 position open for a talented, energetic, strongly motivated, young scientist at the Experienced Researchers (ER, i.e. post-doc) level.
Please see our Job Vacancies page.
Life after THREADMILL: Congratulations to Shane O'Donnell for securing a new appointment at BASF, after an 18 months ER period at Oxford
Electrochemical synthesis of PEDOT derivatives bearing imidazolium-ionic liquid moieties (p 3010-3021)
Novel poly(3,4-ethylenedioxythiophene) (PEDOT) polymers bearing imidazolium-ionic liquid moieties were synthesized by electrochemical polymerization. The polymers could be dissolved in a range of polar organic solvents such as dimethylformamide, propylene carbonate, and dimethyl sulfoxide making them interesting candidates for wet processing methods. Interestingly, the hydrophobic character of electropolymerized films could be modified depending on the anion type. The hydrophobicity followed the trend PF
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| Influence of cyclodextrin size on fluorescence quenching in conjugated polyrotaxanes by methyl viologen in aqueous solution Francine E. Oddy, Sergio Brovelli, Matthew T. Stone, Eric J. F. Klotz, Franco Cacialli and Harry L. Anderson
Poly(4,4 (J. Mater. Chem., 2009, 19, 2846 - 2852, DOI: 10.1039/b821950h) |
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Mechanism of Charge Transport along Zinc Porphyrin-Based Molecular Wires Aleksey A. Kocherzhenko, Sameer Patwardhan, Ferdinand C. Grozema, Harry L. Anderson and Laurens D. A. Siebbeles. In this study charge transport along zinc porphyrin-based molecular wires is simulated, considering both bandlike and hopping mechanisms. It is shown that bandlike transport simulations yield significantly overestimated hole mobility values. On the basis of kinetic and thermodynamic considerations, it is inferred that charge transport along zinc porphyrin-based molecular wires occurs by small polaron hopping. Hole mobility values on the order of 0.1 cm2 /(V s) are found from small polaron hopping simulations, which agree well with previously reported experimental results. It is suggested that the experimentally observed increase of the charge carrier mobility on formation of supramolecular ladderlike structures is determined by two factors. One of these is an increase of charge transfer integrals between monomer units due to molecular wire planarization. A more important factor is the reduction of the amount of energetic disorder along the molecular wire and in its environment. General guidelines for determining the mechanism of charge transport along molecular wires are discussed. (JACS, 2009, ASAP.DOI: 10.1021/ja809174y) |
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Supramolecular Crystal Engineering at the Solid-Liquid Interface from First Principles: Toward Unraveling the Thermodynamics of 2D Self-Assembly (p NA) The formation of highly ordered 2D supramolecular architectures self-assembled at the solid-solution interfaces is subject to complex interactions between the analytes, the solvent, and the substrate. These forces have to be mastered in order to regard self-assembly as an effective bottom-up approach for functional-device engineering. At such interfaces, prediction of the thermodynamics governing the formation of spatially ordered 2D arrangements is far from being fully understood, even for the physisorption of a single molecular component on the basal plane of a flat surface. Two recent contributions on controlled polymorphism and nanopattern formation render it possible to gain semi-quantitative insight into the thermodynamics of physisorption at interfaces, paving the way towards 2D supramolecular crystal engineering. Although in these two works different systems have been chosen to tackle such a complex task, authors showed that the chemical design of molecular building blocks is not the only requirement to fulfill when trying to preprogram self-assembled patterns at the solid-liquid interface. (Advanced Materials, Published Online: Feb 6 2009 7:17AM, DOI: 10.1002/adma.200802068) |
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Pre-programmed bicomponent porous networks at the solid–liquid interface: the low concentration regime The control over the formation of a bicomponent porous network was attained by self-assembly at the solid–liquid interface, exploiting triple H-bonds between melamine and bis-uracyl modules.
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Tuning Intrachain versus Interchain Photophysics via Control of the Threading Ratio of Conjugated Polyrotaxanes Effective nanoscale control of intermolecular interactions in conjugated polymers is needed for the optimal development and exploitation of the latter in low-cost, large-area consumer electronics items, such as light-emitting and photovoltaic diodes, or transistors. Here we report our investigations on insulated molecular wires constituted by conjugated polymers threaded into cyclodextrin rings. Until now, there has been no detailed quantitative understanding of the role of progressive cyclodextrin encapsulation (quantifiable by the so-called “threading ratio”, TR, or number of cyclodextrins per repeat unit) in tailoring the photophysics of the conjugated polymeric wires. We combine spectroscopic, electrical and surface analysis techniques to elucidate how the TR of cyclodextrin-threaded molecular wires controls formation of interchain species and related physical properties (0 < TR = 2.3; the maximum theoretical TR for close-packed CDs is 2.8). Increasing TR enhances the solid-state photoluminescence (PL) and electroluminescence quantum efficiency. To unravel the effect of progressive encapsulation on the intrachain decay kinetics of the polymer backbone, we added an electron-accepting quenching agent, methyl viologen (MV), to the polymer solutions. MV predominantly quenches the aggregate PL, thus enabling measurement of the decay kinetics of the intrinsic exciton even for low-TR polyrotaxanes, for which the different contributions are otherwise difficult to disentangle.
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Control of Rapid Formation of Interchain Excited States in Sugar-Threaded Supramolecular Wires |
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Synthesis and Optoelectronic Properties of Nonpolar Polyrotaxane Insulated Molecular Wires with High Solubility in Organic Solvents |
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Ground- and Excited-State Pinched Cone Equilibria in Calix[4]arenes Bearing Two Perylene Bisimide Dyes
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Radical Cation Stabilization in a Cucurbituril Oligoaniline Rotaxane |
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Gianluca Latini, Lisa-Jodie Parrott, Sergio Brovelli, Michael J. Frampton, Harry L. Anderson, Franco Cacialli
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Amylose-wrapped luminescent conjugated polymers |
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Nucleation-Governed Reversible Self-Assembly of an Organic Semiconductor at Surfaces: Long-Range Mass Transport Forming Giant Functional Fibers
Solvent-vapor annealing has been successfully employed to increase the degree of order in the self-organization of a perylene-bis(dicarboximide) derivative cast on different substrates from solution (see figure). Upon exposure to tetrahydrofuran vapors, the starting needle-like structures rearrange into millimeter-long fibers, which have a sub-micrometer cross section, with remarkable mass transport at the surface. |
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-diphenylenevinylene) rotaxanes and [2]rotaxanes with 
-, 
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-cyclodextrin macrocycles were synthesised and their sensitivities to fluorescence quenching by methyl viologen in aqueous solution were determined, relative to uninsulated analogues. Stern–Volmer analysis revealed that the fluorescence quenching response of polyrotaxanes is strongly dependent on the diameter of the cyclodextrins. Polyrotaxanes, composed of the smaller diameter 
