CHEM 4701 Lecture Notes - Lecture 1: Square Planar Molecular Geometry, Paga, Lewis Structure
Document Summary
Quiz wednesday (15 min, but takes less time) 2 --> they are cones nodal planes = blue. The top and bottom f are axial --> they see 3 f @ 90o. Middle flourines = equatorial --> they see 2 f at 90o and 2f at 120o. 90o repulsion > 120o repulsion axial p-f bond longer --> it feels 3 * 90o repulsions. Lone pairs have more repulsion, so better to put them in equatorial. Axial has 3 90o repulsions, while equatorial only has 2. -> lone pair is going tobe in equatorial position to minimize lone pair e-/bonding pair e- repulsion. ->lone pair/bonding pair e- repulsion > bonding pair/bonding pair repulsion lone pair in equatorial called seesaw geometry. Even if you have another lone pair, it will go into equatorial --> t shaped. 3rd lone pair --> equatorial --> linear geometry.
