• The study ofcis- andtrans-2 butene using mass spectrometry

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    • Keywords


      Cis-2-butene; trans-2-butene; mass spectrometry; geometrical isomerism

    • Abstract


      Using mass spectrometric technique, the effect of geometrical isomerism on the first and higher appearance energy values for C4H3+, C4H7+ and C3H,3+ ions obtained from cis-2-butene andtrans-2-butene is reported. The structure in the ionization efficiency curves (studied for 9 eV above threshold) for the same ions obtained from the two isomers is reported and compared. It is believed that at threshold C4H7+ fragment is formed from the two isomers as methallyl ion. For C3H3+ fragment formed from the cw-isomer at threshold the proposed structure is the propargyl ion with ΔHf equal to 279-4 kcal/mole while for that ion obtained fromtransisomer the proposed structure is the allenyl ion with ΔHf equal to 296.6 kcal/mole.

    • Author Affiliations


      Ezzat T M Selim1

      1. Nuclear Physics Department, Atomic Energy Establishment, Cairo, Egypt
    • Dates

  • Journal of Chemical Sciences | News

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