CHEM102 Lecture Notes - Lecture 21: Square Planar Molecular Geometry, Cisplatin, Chemical Formula

• School: University of Alberta
• Department: Chemistry
• Course: CHEM102
• Professor: Yoram Apelblat

Document Summary

Isomers = molecules with the same molecular formula but with a different structure. The 2nd online quiz is likely to open this friday and will cover unit 3. Bonds are the same but spatial arrangement is different. Same formula but different complex ion and counter ion. Different attachment point for at least one ligand. The cis isomer (cisplatin) is used in anticancer drugs. Geometrical isomers cis trans isomers facial meridional isomers cis trans isomerism. Occurs in square planar and octahedral geometries cis. Note that the ligands don"t have all to be identical. Occurs in octahedral complexes when 3 identical ligands are present: Meridional all on the same side, 90 to each other. 2 of the 3 identical ligands are across from each other at 180 . Isomers that have opposite effect on plane polarized light. When light is emitted , the electric fields of the photons are oriented randomly.