Linear amines, from propylamine up to nonylamine, are studied at ambient conditions by x-ray scattering and Molecular Dynamics simulations of various force eld models. The major nding is that the pre-peak in alkylamines is of about one order of magnitude weaker than that in alkanols, hence suggesting much weaker hydrogen bonding induced clustering of the amine groups than for the hydroxyl groups. Computer simulation studies reveal that OPLS-UA model reproduces the pre-peak, but with larger amplitudes, while the GROMOS-UA and CHARMM-AA force elds show almost no pre-peak. Simulations of all models show the existence of hydrogen bonded clusters, equally conrmed by the prominent pre-peak of the structure factor between the nitrogen atoms. The hydrogen bond strength, as modeled by the Coulomb association in classical force eld models, is about the same order of magnitude for both systems. Then, one may ask what is the origin of the weaker pre-peak in alkylamines? Simulation data reveals that the existence of the prepeak is controlled through the cancellation of the positive contributions from the charged group correlations by the negative ones from the cross charged-uncharged correlations. The C2v symmetry of the amine head