Abstract
The gas-phase basicity (GB) of histamine (1) relative to ammonia (defined as the standard Gibbs energy change for reaction 1) has been measured by means of Fourier transform ion cyclotron resonance spectroscopy (FT-ICR): 1H + (g) +NH 3 (g)⇄1(g)+NH 4 + (g). The various tautomer/conformers of 1H + (g) were studied by means of ab initio SCF-LCAO-MO calculations at the 6-3 IG//6-3 IG level. The calculated proton affinity agrees well with that estimated from FT-ICR results
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