Bond length and bond multiplicity: sigma-bond prevents short pi-bonds.
Analysis of model compounds such as Fe2(CO)6, C2 and HBBH shows that pi-bonds left to themselves are shorter than sigma-bonds; in many ways sigma-bonds prevent pi-bonds from adopting their optimal shorter distances.
Jemmis
Eluvathingal D
ED
School of Chemistry, University of Hyderabad, Hyderabad 500 046, India. jemmis@ipc.iisc.ernet.in
Pathak
Biswarup
B
King
R Bruce
RB
Schaefer
Henry F
HF