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Showing 1 to 20 of 26 for “"polyacetylene"”.
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Synthesis and characterization of polyacetylene
Thesis (Sc.D.)--Massachusetts Institute of Technology, Dept. of Materials Science and Engineering, 1983.
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Isolation of polyacetylene: Exploring the properties of isolated, oriented, and insulated polyacetylene utilizing inclusion crystal chemistry
… creation of isolated, oriented and insulated polyacetylene (PA) chains was assisted by utilizing the favorable features of self assembling inclusion compounds to form inclusion complexes (IC). Calculations suggesting that conducting or even superconducting behavior is anticipated for a …
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Electronic and magnetic properties of trans-polyacetylene
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Physics, 1994.
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The Synthesis, Characterisation and Electrical Conductivity of Poly(Styrene-Co-Acetylene)
… of acetylene has been developed. The polyacetylene produced by this new catalyst has been characterised by infra-red and NMR spectroscopy. The conductivity of the pristine material has been studied as a function of temperature, pressure and frequency. The effect on the conductivity of …
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Feynman-Dyson perturbation theory applied to model linear polyenes
… in semiempirical calculations on trans - polyacetylene. A variety of soliton-like excited states of the molecule were studied by the PPP-UHF-RPA method. The results of this study provide useful information on the nature of these states, which are thought to account for the unique …
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The Synthesis, Characterisation and Electro-Optical Properties of Polypentenylene-Block-Co-Acetylene
… WCl6/LiBu, WCI6/AIEtCl2and WCI6/AIEt3. The polyacetylene was characterised by infra-red spectroscopy, elemental analysis and scanning electron microscopy. Block copolymers containing polyacetylene and polypentenylene segments were synthesised by sequential addition of cyclopentene and …
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Part I. The Acyl-Tunichlorins: A New Class of Nickel Chlorins Isolated From the Caribbean Tunicate Trididemnum Solidum. Part II. Cytotoxic Constituents of the Sponges Stylissa Carteri and Petrosia Sp. Part III. Electrospray Tandem Mass Spectrometry Studies
… peptides and depsipeptides. Furthermore a new polyacetylene was identified in the marine sponge Petrosia sp.
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Control of Nanoscale Thermal Transport for Thermoelectric Energy Conversion and Thermal Rectification
… of thermal conductivity in polyaniline and polyacetylene are investigated. The reduction in thermal conductivity leads to improvement in thermoelectric figure of merit. Thermal diodes allow heat transfer in one direction and prevents in the opposite direction. These materials have potential …
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Die Synthese von (2Z,4E)-Diencarbonsäureestern und ihre Anwendung in der Totalsynthese von Polyacetylenen
… Im Anschluss wurden sechs verschiedene Polyacetylene mit einer (3Z,5E)-Dien-1-in-Einheit hergestellt. Schlüsselschritte in ihrer Synthese waren immer die RBRV-Sequenz zum Aufbau der Z,E-Dien-Einheit, die Transformation des Esters in ein terminales Alkin sowie die …
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Real time density functional simulations of quantum scale conductance
… use them to examine transport in a simple trans-polyacetylene wire. The remaining chapters are devoted to examining real-time transport behavior of various systems and model chemistries. Open-shell calculation of the polyacetylene wire reveal that, in agreement with various correlated model …
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On-Metal Synthesis of Some Aryl Substituted Rhenium η<sup>5</sup> Cyclopenta[C] Pyridazyl Complexes
… as compared to non-aromatic analogs (e.g. polyacetylene). We are interested in synthesizing organometallic pyridazines and rhenium pyridazyl complexes for polymer research. SeveraI5,6-fused ring pyridazines (1,2-CsH3(CRNH)(CRN) have been synthesized and characterized. Additionally, …
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Inflammation enhanced colon cancer & natural anti-cancer plant compounds
… COX-2 and IL-6 production from inflammation. The polyacetylene gymnasterkoreayne B (GKB) was previously shown to increase detoxification enzymes, but has not previously been tested for anti-cancer activity (1). Here we tested 10% broccoli, 5% broccoli sprouts, GKB and a GKB-rich extract from …
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Microcanonical simulations in classical and quantum field theory
… of the Su-Schrieffer-Heeger Hamiltonian for polyacetylene, a one-dimensional polymer where fermion-boson interactions play a dominant role in the dynamics of the system. The pure microcanonical simulation method fails in the marginally ergodic case and a stochastic adaptation, the hybrid …
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Synthesis and Characterization of Some Rhenium Complexes
… its conductivity by 12 orders of magnitude. Polyacetylene, although showing promise as an organic conductor, because it is highly air-sensitive and oxidizes when exposed to molecular oxygen, therefore making this an unattractive use for commercial products. Attention has been focused on …
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Functional Polymer Materials: From Iptycenes to Ring-Opening Polymerizations
… seek to synthesize a dibenzobarrelene-elaborated polyacetylene, whereby the dibenzobarrelene groups can provide stability by steric shielding, as well as a site for attaching solubilizing and functional groups. Routes based on dehydrogenation, bromination–elimination, sulfoxide elimination, and …
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INFRARED SPECTROSCOPY AND KINETICS OF TRANSIENT SPECIES
… species produced in a discharge in Ar over polyacetylene and deuterated polyacetylene has been studied using an improved magnetic rotation technique and color center laser probing. Five bands ((0-1), (1-2), (2-3), (3-4), and (4-5)) of the C$\sb2$ $b\sp 3\Sigma\sbsp{\rm g}{-}\gets a \sp …
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Off-Metal Synthesis of Some Aryl Substituted Rhenium n5-Cyclopenta [C] Pyridazyl Complexes
… as compared to non-aromatic analogs (e.g. polyacetylene). Our current interests focus upon the potential role of pyridazines in next generation electronic devices that utilize organics as the semiconducting material. Pyridazines, 6-membered aromatic rings with two adjacent nitrogens, are …
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Wavefunction-based method for excited-state electron correlations in periodic systems - application to polymers
… polymers and crystals. In the present work trans-polyacetylene is chosen as a test system. The corresponding band structure is obtained with the correlation of all electrons in the system being included on a very high level of sophistication. The account of correlation effects leads to substantial …
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Hormetic dietary phytochemicals from Western Canadian plants: Identification, characterization and mechanistic insights
… activity including fatty-acid derived polyacetylenes, phthalides, and cannabinoids. Studies using low molecular weight thiols and the recombinantly expressed protein Keap1, the principal negative regulator of Nrf2, supported a mechanism of QR activation involving covalent modification …
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Linear scaling density functional theory with Gaussian orbitals and periodic boundary conditions
… of our method with benchmark calculations on polyacetylene, poly(p-phenylenevinylene) (PPV), and a series of carbon and boron-nitride single wall nanotubes employing basis sets of double zeta plus polarization quality, in conjunction with generalized gradient approximation and kinetic energy …
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