## 4.43 Increasing s-character of hybrids

$sp, sp^{2}, sp^{3}, dsp^{3}, d^{2}sp^{3}$

Sarah Bui 2L
Posts: 61
Joined: Fri Sep 28, 2018 12:29 am

### 4.43 Increasing s-character of hybrids

Why is it that increasing s-character also increases bond angle?

Noting that the bond angle of an sp3 hybridized atom is 109.5 and that of an sp2 hybridized atom is 120#, do you expect the bond angle between two hybrid orbitals to increase or decrease as the s-character of the hybrids is increased?

Samantha Man 1L
Posts: 63
Joined: Fri Sep 28, 2018 12:22 am

### Re: 4.43 Increasing s-character of hybrids

If you look at sp3, you see that the s character is 25% and the p character is 75% and if you look at sp2, you see that the s character is 33.3% and the p character is 66.6%. sp3 hybridization has bond angles of 109.5 degrees, while sp2 hybridization has bond angles of 120 degrees. So you can see that as the s character increases in the hybrid, the bond angle between the hybrid orbitals also increases.

Claudia Luong 4K
Posts: 59
Joined: Fri Sep 28, 2018 12:25 am

### Re: 4.43 Increasing s-character of hybrids

s-character of sp: 50%, sp^2: 33%, sp^3: 25%, etc.
s-character increases as you go from sp^3 hybridization to sp hybridization. While in sp^3, there are four regions of electron density, sp has two. Less regions of electron density allow for more room between the regions so the bond angles increase as s-character increases.