CHEM 001B Lecture Notes - Lecture 4: Polycyclic Aromatic Hydrocarbon, Structural Formula, Antibonding Molecular Orbital
9 Mar 2018
School
Department
Course
Professor
Document Summary
Molecular recognition: the process by which molecules interact with other molecules in living tissues to produce a biological effect, example: ethylene (ripening agent) Drawing larger molecules: write the condensed formula and carbon-skeleton structure for a straight chain octane, ch3(ch2)6ch3 (condensed, /\/\/\/ (carbon-skeleton) Delocalization: spreading of electrons in alternating single and double bonds over three or more atoms in a molecule. Aromatic compounds: a (cid:272)(cid:455)(cid:272)li(cid:272), pla(cid:374)ar (cid:272)o(cid:373)pou(cid:374)d (cid:449)ith delo(cid:272)alized ele(cid:272)tro(cid:374)s a(cid:271)o(cid:448)e a(cid:374)d (cid:271)elo(cid:449) the pla(cid:374)e of the molecule, example: polycyclic aromatic hydrocarbons, planar shape may allow intercalation in dna. Optical isomers = chirality: chirality property of a molecule that is not superimposable on its mirror image. How to identify a chiral center: a chiral carbon is a carbon atom that is attached to four different types of atoms or groups of atoms. Limitation of valance bond theory: some experimental observations cannot be explained with valance bond theory.
