CHEM 5 Study Guide - Sodium Cyclopentadienide, Electronvolt, Ion
Document Summary
Torsion angles are important paramters for describing the conformaitons of polyatomic molecules. A torsion angle is defined by the positions of four atoms. Here i, j, k, and l ae the indices of the four atoms, and the torsion angle, fijkl is defined as the angle between the planes that contain atoms i, j, k and j, k, l. Mathematically, fijkl = arccosj u . v u v. N where u and v are vectors normal to the ijk and jkl planes: u = rij x rjk; v= rlk x rjk; |u| and |v| are the magnitudes, and the bond vectors are defined as: Calculate teh torsion angle (in both radians and degrees) defined by the four atoms whose positions are given in the table: rij = ri - rj rjk = rj - rk rlk = rl - rk.
