Extensive Combinations of Clustering Sets of Sulfuric Acid and Various Solvents

抄録

The FAB mass spectra of the mixtures of the sulfuric acid and 14 solvent molecules (acetone, methyl alcohol, ethyl alcohol, 1-propyl alcohol, 2-propyl alcohol, 1-butyl alcohol, 2-butyl alcohol, t-butyl alcohol, 1-pentyl alcohol, 1-hexyl alcohol, ethylene glycol, acetic acid, dimethyl sulfoxide, and water) were measured and CAD spectra of the cluster ions were also measured.
The FAB mass spectra showed the extensive cluster ions of H₂SO₄ with the solvent, (aH₂SO₄+bSolv+H)⁺, a and b are positive integers or zero. We also tried to investigate CAD spectra of unsymmetrical protonated ions of sulfuric acid and water molecules, (H₂SO₄+H₂O+H)⁺, precisely.
The mass spectra were found to be dehydrated ions, (aH₂SO₄+bSolv-H₂O+H)⁺. In some cases, we determined which dehydration occurred from H₂SO₄ site or from solvent site. For that problem to be solved, the CAD spectra by means of MS/MS (mass spectrometry/mass spectrometry, tandem mass spectrometry) of (aH₂SO₄+bSolv+H)⁺ and (aH₂SO₄+bSolv-H₂O+H)⁺, were needed to measure. Further the special cluster ions (C_nH_2n+1OH-H₂O+H)⁺, if proton resides on the larger PA site, the dehydration occurs on the protonated site. We can decide the dehydration site by the present methods.