- #1
Steven Hanna
- 31
- 1
Here are some first row BDE's (in kcal/mol):
H-CH3 = 105 <---> [H]+ [CH3]-
H-NH2 = 103
H-OH = 119
H-F = 136 <---> [H]+ [F]-
This trend is often rationalized in terms of increasing ionic character (or with no-bond resonance). However, the H-NH2 BDE should have a higher ionic contribution than the H-CH3 BDE. Yet the H-NH2 bond is weaker. Can anyone explain this apparent contradiction?
H-CH3 = 105 <---> [H]+ [CH3]-
H-NH2 = 103
H-OH = 119
H-F = 136 <---> [H]+ [F]-
This trend is often rationalized in terms of increasing ionic character (or with no-bond resonance). However, the H-NH2 BDE should have a higher ionic contribution than the H-CH3 BDE. Yet the H-NH2 bond is weaker. Can anyone explain this apparent contradiction?