TY - JOUR
T1 - Collision‐induced dissociation studies of protonated alcohol and alcohol—water clusters by atmospheric pressure ionization tandem mass spectrometry. 1Methanol
AU - Karpas, Z.
AU - Eiceman, G. A.
AU - Harden, C. S.
AU - Ewing, R. G.
AU - Smith, P. B.W.
PY - 1994/4
Y1 - 1994/4
N2 - Cluster size distribution and collision‐induced dissociation (CID) studies of protonated methanol and protonated methanol—water clusters yield information on the structure and energetics of such ions. Ions were formed at atmospheric pressure in a corona discharge source, and were subjected to CID in the center quadrupole of a triple quadrupole mass spectrometer. Cluster ions containing up to 13 molecules of methanol and/or water were observed and examined using CID experiments. The CID of all (CH3OH)n · H2O · H+ clusters, where n ⩽ 8, showed that water loss was statistically favored over methanol loss and that the preferred dissociation channel involved loss of water with methanol molecules. These results support a model employing a chain of hydrogen‐bonded solvent molecules rather than one in which fused rings of ligands surround a central hydronium ion. However, CID of larger clusters, where n ⩾ 9, showed that loss of one methanol was equal to or less than loss of water, reflecting a change in structure.
AB - Cluster size distribution and collision‐induced dissociation (CID) studies of protonated methanol and protonated methanol—water clusters yield information on the structure and energetics of such ions. Ions were formed at atmospheric pressure in a corona discharge source, and were subjected to CID in the center quadrupole of a triple quadrupole mass spectrometer. Cluster ions containing up to 13 molecules of methanol and/or water were observed and examined using CID experiments. The CID of all (CH3OH)n · H2O · H+ clusters, where n ⩽ 8, showed that water loss was statistically favored over methanol loss and that the preferred dissociation channel involved loss of water with methanol molecules. These results support a model employing a chain of hydrogen‐bonded solvent molecules rather than one in which fused rings of ligands surround a central hydronium ion. However, CID of larger clusters, where n ⩾ 9, showed that loss of one methanol was equal to or less than loss of water, reflecting a change in structure.
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U2 - 10.1002/oms.1210290402
DO - 10.1002/oms.1210290402
M3 - Article
AN - SCOPUS:84989078267
VL - 29
SP - 159
EP - 168
JO - Journal of Mass Spectrometry
JF - Journal of Mass Spectrometry
SN - 1076-5174
IS - 4
ER -