1D-O2-1700 PDF
Proton Transfer and Complex Formation of Biomolecular Ions with Gaseous Molecules at Various Temperature
Proton transfer reactions of biomolecular ions, [M + zH]z+, to primary and secondary amines, ethylenediamine, and pyridine groups were examined in the gas phase. Absolute reaction rate constants for proton transfer were determined from intensities of parent and product ions in the mass spectra. With change of temperature, remarkable change was observed for distribution of product ions and reaction rate constants. Proton transfer reaction was enhanced or reduced by complex formation of [M + zH]z+ with gaseous molecules. The results relate to conformation changes of [M + zH]z+ with change of temperature, which are induced by complex formation and or by thermal collision with He. An issue that is attracting considerable attention is vacuo conformations might resemble structural evolution that originated from temperature in the gas phase.