Search results for "Arrhenius equation"

showing 3 items of 83 documents

Apparent activation energies and apparent frequency factor in polarographic waves of paludrine-Zn(II)

1993

Abstract Arrhenius and Vlcek plots of ac 1 and dp polarograms of paludrine-Zn complexes are tested in order to understand the apparent activation energies and pre-exponential factor, and their dependence on the potential. These empirical treatments are useful for obtaining information about the energetic contributions of the elemental processes associated with the Zn(II) and paludrine ligands in the overall mechanism of reduction of the complex 2:1 on the mercury interface.

chemistry.chemical_classificationArrhenius equationPolarographyStereochemistryGeneral Chemical Engineeringchemistry.chemical_elementFrequency factorActivation energyBuffer solutionElectrochemistryMercury (element)chemistry.chemical_compoundsymbols.namesakechemistryElectrochemistrysymbolsPhysical chemistryInorganic compoundElectrochimica Acta
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Kinetic Investigation on Metal Free Anionic Polymerization of Methyl Methacrylate Using Tetraphenylphosphonium as the Counterion in Tetrahydrofuran

1997

The anionic polymerization of methyl methacrylate using tetraphenylphosphonium triphenylmethanide as an initiator proceeds in a living manner even at room temperature. The rate constants of propagation were measured between -20 and +20 °C using a flow tube reactor. At 0 °C the reaction half-lives range from 0.3 to 1 s. The polymerization follows first-order kinetics with respect to monomer conversion (with a short induction period) and shows a linear dependence of the number-average degree of polymerization on conversion with high initiator efficiencies and narrow molecular weight distributions (M w /M n < 1.1). The dependence of the measured rate constants on the active center concentratio…

chemistry.chemical_classificationArrhenius equationPolymers and PlasticsOrganic ChemistrySolution polymerizationDegree of polymerizationInorganic Chemistrychemistry.chemical_compoundsymbols.namesakeAnionic addition polymerizationReaction rate constantchemistryPolymerizationPolymer chemistryMaterials ChemistrysymbolsPhysical chemistryCounterionMethyl methacrylateMacromolecules
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Synthesis, crystal structures and magnetic properties of M(II)Cu(II) chains (M = Mn and Co) with sterically hindered alkyl-substituted phenyloxamate …

2011

A series of neutral oxamato-bridged heterobimetallic chains of general formula [MCu(L(x)2 (S)2] · p S · q H2O [p = 0-1, q = 0-2.5; L1 = N-2,6-dimethylphenyloxamate, S = DMF with M = Mn (1a) and Co (1b); L2 = N-2,6-diethylphenyloxamate, S = DMF with M = Mn (2a) and Co (2b) or S = DMSO with M = Mn (2c) and Co (2 d); L3 = N-2,6-diisopropylphenyloxamate, S = DMF with M = Mn (3a) and Co (3b) or S = DMSO with M = Mn (3c) and Co (3d)] were prepared by treating the corresponding anionic oxamatocopper(II) complexes [Cu(L(x))(2)]2- (x = 1-3) with M(2+) cations (M = Mn and Co) in DMF or DMSO as the solvent. The single-crystal X-ray structures of 2a and 3a reveal the occurrence of well-isolated, zigzag…

chemistry.chemical_classificationSteric effectsArrhenius equationStereochemistryOrganic Chemistrychemistry.chemical_elementGeneral ChemistryActivation energyManganeseCrystal structureCatalysisCrystallographysymbols.namesakechemistryOctahedronFerrimagnetismsymbolsAlkylChemistry (Weinheim an der Bergstrasse, Germany)
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