CHM 501 Lecture

Molecular Orbital Theory

Are VBT and weak interactions adequate for description of the chemical and physical properties in simple molecules?

Consider the simple diatomics:

molecule
Lewis Structure
bond
boiling point
bond length
bond energy
reactivity
magnetic properties

N2

N≡N

triple bond

77 K

110 pm

942 kJ/mol

unreactive

diamagnetic

O2

O=O

double bond

90 K

121 pm

494 kJ/mol

moderately reactive

paramagnetic

F2

F–F

single bond

85 K

141 pm

155 kJ/mol

very reactive

diamagnetic