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Electronic Control (electronic + control)

Distribution by Scientific Domains
Chemistry60%

Terms modified by Electronic Control

  • electronic control device
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    Selected Abstracts

    Electronic Control of the Rotational Barrier in ,2 -Alkyne-1-thio Complexes

    EUROPEAN JOURNAL OF INORGANIC CHEMISTRY, Issue 7 2007
    Wolfram W. Seidel
    Abstract A family of thio-alkyne complexes [Tp,Mo(CO)(L)(BnSC2S)] {Bn = benzyl, Tp, = hydrotris(3,5-dimethylpyrazolyl)borate, L = carbonyl (2), 2,6-dimethylphenyl isocyanide (7), tert -butyl isocyanide (8), 4-(dimethylamino)pyridine (9)} was prepared by reductive removal of a benzyl group in the corresponding bis(benzylthio)acetylene complexes [Tp,Mo(CO)(L)(BnSC2SBn)](PF6) (1 -PF6, 4 -PF6, 5 -PF6 and 6 -PF6). All complexes were characterized by IR, 1H, 13C spectroscopy and cyclic voltammetry. X-ray diffraction studies of 5 -PF6, 8 and 9 were carried out. The alkyne ligand is bound symmetrically to molybdenum in 5 -PF6 and unsymmetrically in 8 and 9. The trend in the ,-acidity of ligand L is reflected in the spectroscopic and electrochemical data as well as in the molecular structures. Variable temperature 1H NMR investigations with 7, 8 and 9 disclosed that the barrier of the alkyne rotation at molybdenum decreases in the order of rising electron density at the metal center while the steric demand increases. Therefore, electronic control of the barrier by the specific character of the ligand L is evident.(© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2007) [source]

    Synthesis of Some New Substituted Photochromic N,N, -Bis(spiro[1-benzopyran-2,2,-indolyl])diazacrown Systems with Substituent Control over Ion Chelation

    EUROPEAN JOURNAL OF ORGANIC CHEMISTRY, Issue 4 2006
    Craig J. Roxburgh
    Abstract The reversible photochemical ion chelation of the newly synthesised substituted N,N, -bis(spiro[1-benzopyran-2,2,-indolyl])diazacrown systems 15a,c and the subsequent molecular electronic control of this process using appropriately placed substituent groups on the spiro-benzopyran skeleton is reported. The principle of molecular electronic control of ion chelation is demonstrated by comparing the behaviour of the newly synthesised nitro-substituted and pyrido-annulated spiro-benzopyran system 9b with that of the unsubstituted compound 9a. Electronic substituent control over ion chelation is then exemplified for the new N,N, -bis(5,-nitrospiro[1-benzopyran-2,2,-indolyl])diazacrown system 15c and further exemplified for the corresponding 5,-trifluoromethyl derivative 15b, which contains the photochemically more robust trifluoromethyl group. The crown system 15a, unsubstituted in the spiro-indole moiety, is also reported. (© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2006) [source]

    Active Control of Epithelial Cell-Density Gradients Grown Along the Channel of an Organic Electrochemical Transistor

    ADVANCED MATERIALS, Issue 43 2009
    Maria H. Bolin
    Complex patterning of the extracellular matrix, cells, and tissues under in situ electronic control is the aim of the technique presented here. The distribution of epithelial cells along the channel of an organic electrochemical transistor is shown to be actively controlled by the gate and drain voltages, as electrochemical gradients are formed along the transistor channel when the device is biased.. [source]

    Photovoltaic-powered cold store and its performance

    INTERNATIONAL JOURNAL OF ENERGY RESEARCH, Issue 5 2001
    J. Nagaraju
    Abstract A photovoltaic-powered cold store plant, the first of its kind, has been developed to store 10 tons of frozen fish at ,15°C. It consists of a photovoltaic array (4 kW peak), a battery bank (96 V DC, 180 A H), a vapour compression refrigeration system (1 ton), electronic controls for automatic operation of plant and an insulated cold chamber. Experiments were conducted on the system to evaluate its performance with no heat load (frozen fish at ,15°C) and with different heat loads. It is observed that the system can be operated with a maximum heat load of 2350 W to maintain the walk-in-cooler temperature below the freezing point of fish (,2°C). The performance studies conducted on these subsystems viz., photovoltaic array and battery bank showed that their output has deteriorated in 5 years. Copyright © 2001 John Wiley & Sons, Ltd. [source]