Investigation of Ethynylfurans Using the Electron Propagator Theory

The first eleven vertical ionization energies of mono and diethynylfurans have been calculated using various electron propagator decouplings. Among all ethynylfurans, the pi-orbital interactions between ethynyl and furan moieties are found to be strongest in 2,5-diethynylfuran. Oxygen atom of the furan ring and carbon atoms of ethyne group play important role in stabilization/destabilization of HOMO/LUMO of ethynylfurans. Our results for energetic stability, dipole moment, HOMO-LUMO gap, ionization energies, and electron affinity indicate that 2-ethynylfuran among monoethynylfurans and 2,5-diethynylfuran among ethynylfurans may be useful precursors for the preparation of conducting polymers.