Valence Bond Theory. Linus Pauling Author: “Nature of the chemical bond” Received Nobel prize in 1954 for his work Introduced concept of orbital hybridization.

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Presentation transcript:

Valence Bond Theory

Linus Pauling Author: “Nature of the chemical bond” Received Nobel prize in 1954 for his work Introduced concept of orbital hybridization

Valence bond theory – the basic idea Two half-filled orbitals overlap to form a covalent bond. The electrons in this new probability density are then shared by both atoms (equally attracted to both nuclei)

Two s orbitals overlapping

– all form covalent bonds - all overlapping orbitals must be half- filled - the new probability distribution formed can only have a max of two electrons Other overlaps

Types of covalent bonds Orbitals can overlap in two main ways creating two different types of covalent bonds Sigma bonds & Pi bonds

The σ bond Electron density is between the nuclei of the overlapping atoms

The π bond Electron densities are above and below the nuclei of the bonding atoms

Only p orbitals can form pi bonds!

Single bonds σ bonds

Double Bond one π bond & one σ bond

Triple bond two π bond & one σ bond

The benzene ring

Promotion & Hybridization Certain atoms can change their electron configuration in order to bond and form a wide variety of compounds This “change” in electron configuration takes place in two steps: Promotion of an electron to a higher energy orbital & hybridization or blending of orbitals creating a new type of orbital for bonding

Promotion Most of the time atoms exist in their “ground state” but, in certain cases the instant before bonding promotion takes place allowing more bonding spaces :

Hybridization The blending of orbitals Blending orbitals must all be half filled No orbitals are “lost” due to blending – if you blend one s orbital and one p orbital you will end up with TWO hybrid orbitals!

Hybridization in carbon to form methane (CH 4 )

Types & Names of hybrid orbitals The type of hybrid orbital depends upon the orbitals which have been blended

Once hybridization has occurred – hybridized orbitals are ready to bond – just like regular orbitals Bonding in hybridized orbitals

Because of their shape, hybrid orbitals can only undergo sigma bonding.

Shapes & Hybrids – a little trick :0)