흑연의 결합 차수. bond order of C-C in graphite

흑연의 결합 차수. bond order of C-C in graphite

 

 

The C-C bond length in graphite is 1.42 Å.

How does this compare with the C-C bond length in:

a. diamond 1.54 Å

b. benzene 1.39 Å

c. ethylene 1.33 Å

What do you expect the bond order is in graphite?

 

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I would expect the bond order of graphite to be most similar to that of benzene given the similar bond distances in these 2 compounds.

 

In graphite, each carbon atom is sp2 hybridized and exits in a sheet of hexagons (each C atom is bonded to 3 others). This means that each carbon atom forms 3 σ bonds with its 3 neighbors and then shares a π bond across all 3.

 

So the overall bond order is 4 bonds / 3 atoms = 1.33.

 

 

[참고]
bond order of C-C in diamond = 4 bonds / 4 atoms = 1

bond order of C-C in graphite = 4 bonds / 3 atoms = 1.33
bond order of C-C in benzene = 3 bonds / 2 atoms = 1.5
bond order of C-C in ethylene = 2 bonds / 1 atom = 2

bond order of C-C in acetylene = 3 bonds / 1 atom = 3

 

 

▶ 결합 수 / 원자 수 = 결합 차수
( 결합 수: 탄소 1개당 다른 탄소와 결합한 수. σ-결합, π-결합, 각각 하나씩 count )
( 원자 수: 탄소 1개당 결합한 다른 탄소의 수 )

 

 

[키워드] 결합차수