Weili Qian, N. Mirkin, S. Krimm
Dec 17, 1999
Citations
0
Influential Citations
36
Citations
Journal
Chemical Physics Letters
Abstract
Abstract An MP2/6-31+G ∗ calculation of the N -methylacetamide dimer shows that it has two minimum energy structures, both hydrogen bonded with peptide planes roughly perpendicular to each other. A complete molecular mechanics optimization of the dimer has been done, using a model for the intermolecular interactions consisting of charges, atomic dipoles, and van der Waals interactions and the methodology of our spectroscopically determined force field for the intramolecular interactions. The two structures are satisfactorily reproduced, as are their interaction energies, their dipole moments, and, from the point of view of our goal of a spectroscopically accurate force field, their six intermolecular normal mode frequencies.