Thomas D. Smith

Publications (6)1.55 Total impact

• Article: The Molybdenum(V) Chelates Formed by the Reaction of Molydbdenum Hexacarbonyl or Molybdenum Pentachloride with Salicyl(2-pyridyl)aldazine

  Michael Tirant, Thomas D. Smith, John R. Pilbrow
  Journal of Coordination Chemistry 12/1987; 16(3):263-277. · 1.55 Impact Factor
• Article: E.p.r. study of organic free radicals in Victorian brown coal

  Stuart W. Dack, Malcolm D. Hobday, Thomas D. Smith, John R. Pilbrow
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  ABSTRACT: The signals at g≈2 in the e.p.r. spectra of Victorian brown coals are attributed to organic free radicals. Mathematical lineshape analysis and variation of linewidth with frequency suggested that the observed signals at low power levels are mainly homogeneously broadened. Power saturation experiments, however, resolved the signals to show the presence of from one to three resonances due to different free radical types.
  Fuel.
• Article: Free radical involvement in the oxidation of Victorian brown coal

  Stuart W. Dack, Malcolm D. Hobday, Thomas D. Smith, John R. Pilbrow
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  ABSTRACT: Electron spin resonance spectroscopy has been used to investigate free radical involvement in the oxidation of Victorian brown coal. Fresh, wet Yallourn brown coal exhibits two superimposed e.s.r. signals due to organic free radicals. The free radicals responsible for the narrow signal interact reversibly with atmospheric oxygen while the broad signal changes intensity dramatically during prolonged exposure to air. Coal:oxygen complex formation may explain these observations. Results also suggest that the free radical content of brown coal increases as a consequence of vacuum drying.
  Fuel.
• Article: An electron spin resonance study of the copper(II) chelate of 2-(2'-pyridyimethylenehydrazonomethyl)phenol and related compounds

  Michael Tirant, Thomas D. Smith, John R. Pilbrow, Graeme Hanson, Geoffrey R. Sinclair
• Article: Electron Spin Resonance Study of the Copper (II) and Cobalt (II) Chelates of 2,3;7,8;12,13;17,18-Tetrakis-(9,10-dihydroanthracene-9,10-diyl)porphyrazine

  Stuart W. Oliver, Thomas D. Smith, Graeme R. Hanson, Neil Lahey, John R. Pilbrow, Geoffrey R. Sinclair
• Article: E.p.r. study of paramagnetic metal ions in Victorian brown coal

  Stuart W. Dack, Malcolm D. Hobday, Thomas D. Smith, John R. Pilbrow
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  ABSTRACT: Electron paramagnetic resonance (e.p.r.) spectra of some Victorian brown coals in the raw state possess absorbances attributable to metal ion radicals. E.p.r. signals at g≈4.3 and g≈2 (multiplet) have been assigned to iron(III) and manganese(II), respectively. The g≈4.3 signal intensity does not appear to vary directly with the total iron content of the raw coal. The amplitudes of the metal ion signals were found to change with drying of the coal, and were reduced to zero on removal of the metal ions by acid washing. Ion exchange of the sodium form of brown coal with iron(III) reintroduced the g≈4.3 signal and produced an additional broad signal centred at g≈2. The intensity of the latter signal was related to the total iron content of the iron(III)-exchanged coal. The extent of iron(III) exchange was shown to be pH dependent. Other paramagnetic ions, such as oxovanadium(IV), manganese(II) and copper(II) when exchanged onto brown coal produced their characteristic metal ion spectra.
  Fuel.