The factor behind this is the orientation of the overlapped orbitals. Sigma bonds result from head-on(co-axial) overlapping while pi bonds are outcome of lateral(para-axial) overlapping. Here is a pictorial depiction of ethene(sp2 hybridized C atoms) :

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The greater the level of overlapping, the greater the probcapability of finding the valence electrons in in between the nuclei and therefore the bond will certainly be stronger & shorter.

You are watching: Why sigma bond is stronger than pi bond

In MOT, this deserve to be explained utilizing Overlap Integral. This is how Atkins depicts it :

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In straightforward terms, after developing a sigma-bond (a pre-requiwebsite for pi-bonds), the two atoms acquire locked alengthy the inter-nuclear axis. As a result, the orbitals accessible for pi-bonding can only partially overlap, therefore forming a weaker bond.


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edited Jun 19 "14 at 7:00
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Melanie Shebel♦
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blackSmithblackSmith
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As proclaimed formerly, it is due to the head-on overlap of sigma bonds and the lateral overlap of pi-bonds.

The smaller sized overlap of pi bonds likewise describes why double and triple bonds basically exist just for 2nd row facets (C,N,O especially) and not for greater row elements. A C=C bond has a length of 133 pm. A Si-Si bond length is at around 186 pm, therefore the contribution of the pi-integral overlap is nearly negligible.

The incapacity of Silicium to develop solid pi bonds is also among the answer why life on earth is carbon based and not silicium based, considering that the richness of organic chathamtownfc.net is in component due to the capability of carbon to create solid double and triple bonds.


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answered Jun 19 "14 at 3:49
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Pi bonds involve sidemethods overlap while sigma bond requires head on or axial overlap. Axial overlaps have actually higher degree of overlapping than sidemethods overlap.


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edited Jun 18 "14 at 22:57
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Unsaturated compounds (as a result of the visibility of a twin bond) are even more reactive than saturated compounds, bereason the electron density at the internuclear axis is zero in a pi bond (in contrast to the sigma bond).

See more: Which Elements Have Complete Outer Shells Periodic Table Basics?


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edited Mar 5 "14 at 9:06
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tschoppi
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answered Mar 5 "14 at 5:12
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