Mt. Rodgers et Pb. Armentrout, ABSOLUTE BINDING-ENERGIES OF LITHIUM IONS TO SHORT-CHAIN ALCOHOLS, CNH2N-2, N=1-4, DETERMINED BY THRESHOLD COLLISION-INDUCED DISSOCIATION(O), The journal of physical chemistry. A, Molecules, spectroscopy, kinetics, environment, & general theory, 101(14), 1997, pp. 2614-2625
Collision-induced dissociation of Li+(ROH) with xenon is studied using
guided ion beam mass spectrometry. ROH includes the following eight s
hort chain alcohols: methanol, ethanol, 1-propanol, 2-propanol, l-buta
nol, 2-methyl-1-propanol, 2-butanol, and 2-methyl-2-propanol. In all c
ases, the primary product is endothermic loss of the neutral alcohol,
with minor products that include those formed by ligand exchange, alke
ne and water loss, and C-C bond cleavage. The cross-section thresholds
are interpreted to yield 0, 298, and 373 K bond energies for Li+-ROH
after accounting for the effects of multiple ion-molecule collisions,
internal energy of the reactant ions, and dissociation lifetimes. The
experimental bond energies determined here show a fairly constant devi
ation from previous experimental measurements (as obtained by equilibr
ium studies in an ion cyclotron resonance mass spectrometer). This dis
crepancy is discussed in some detail because it affects the absolute L
i+ affinity scale used extensively in the literature.