Combined NMR spectroscopic and quantum mechanical investigation of a biologically relevant hydrogen bonded model system. I. NMR experimental results and estimation of transition state structures energies

Biphenyl-8-carboxylic-2'-NN'-dimethyl-methylamine has been studied as a mod el compound of a biologically relevant hydrogen bonded system. NMR experime ntal studies have been performed to estimate the hydrogen bond energy from the rotational energies of the biphenyl ring and the nitrogen inversion of the amino group. Approximative theoretical calculations have been performed as a complementary study to the NMR experiments.