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Part 1. The complexes between potassium and 1,2-ethanediol or met hanol were generated in a flow reactor and measured with photoion ization mass spectrometry. The threshold energies and photoioniza tion efficiencies of these complexes were decided by analyzing th e Watanabe plots. The appeared three ionization threshold are 3.4 0, 3.60, and 3.67 eV. ab initio Molecular orbital calculation was carried out for these neutral and ion complexes. The optimized e quilibrium geometries and the harmonic vibrational frequencies ar e decided by HF method in 6-31G* basis set. The bond dissociation energies and the adiabatic ionization potentials are calculated with MP2 method and in 6-31G** basis set. The neutral orbital pop ulations, and the Mulliken populations are reported. The correlat ions between experimental and theoretical results are established in our discussion.Part 2. ab initio molecular orbital calculations of the neutral c onformers and the corresponding cations of Na(1,2-ethanediol) hav e been employed to investigate the complexation between sodium an d 1,2-ethanediol. The full geometric optimizations without any re striction of various conformers and harmonic vibrational frequenc ies were calculated with Hartree-Fock method and with standard 6- 31G* basis set. Electron correlation effect was obtained with Mol ler-Plesset perturbation method up to second order ( MP2 ) and 6- 31G** basis set. The bond dissociation energies and the adiabatic ionization potentials are calculated in this level. The Mulliken population analysis and natural orbital population analysis were employed here to understand the relative importance of charge tr ansfer between sodium and neutral 1,2-ethanediol molecule in thes e complexes.
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