MO Diagram of NO: Sigma vs Pi Bonding MOs

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In summary, the conversation discusses the placement of electrons in the MO diagram of NO and whether the sigma or pi MO should be filled first. The speaker suggests using a MO program to calculate the energy levels and mentions that the position of sigma and pi bonding MO can vary among different elements.
  • #1
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I would like to know, in the MO diagram of NO should electrons put in the sigma MO first or pi MO first?
that means , which one has a lower energy level for the MOs.


For O2 , sigma was lower than pi bonding MO because of energy difference between 2s and 2pz, interaction say goodbye

There is a line between N and O... so what about NO ?

Thanks
 
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  • #2
Why don't you just try to calculate it with any freely available MO Program e.g. YaeHMOP, gamess?
They aren't too difficult to use, run on any pc nowadays and you can learn a lot from it!
 
  • #3
so, what can you guess or do when you attend an exam without pc?

The major things I would like to know is the "in between", either one must be the correct MO diagram, right?
 
  • #4
sigma is always lower than pi (or do you mean sigma*?)
 
  • #5
not sigma*, it's sigma

the relative position between sigma and pi bonding MO can vary from Li to N, and O to Ne
 

1. What is an MO diagram?

An MO (molecular orbital) diagram is a visual representation of the distribution of molecular orbitals in a molecule. It shows how atomic orbitals combine to form molecular orbitals, and helps to explain the bonding and properties of a molecule.

2. What is the significance of sigma and pi bonding MOs in the MO diagram of NO?

Sigma and pi bonding MOs are important in the MO diagram of NO because they represent the two types of bonds present in the molecule. Sigma bonding involves end-to-end overlap of atomic orbitals, while pi bonding involves side-to-side overlap. These bonds have different strengths and properties, which affect the overall stability of the molecule.

3. How do the energies of the sigma and pi bonding MOs in NO compare?

In NO, the sigma bonding MO is lower in energy than the pi bonding MO. This is due to the greater overlap and stronger bonding in the sigma bond compared to the pi bond. As a result, the sigma bond is more stable and contributes more to the overall bonding in the molecule.

4. How do the number of electrons in the sigma and pi bonding MOs affect the bond strength in NO?

The number of electrons in the sigma and pi bonding MOs affects the bond strength in NO. The more electrons present in the bonding MOs, the stronger the bond will be. This is because the electrons in the bonding MOs contribute to the overall stability of the molecule by filling in the bonding region between the nuclei.

5. What other factors can influence the MO diagram of NO?

The MO diagram of NO can also be influenced by factors such as bond angle, electronegativity of the atoms, and the presence of lone pairs. These factors can affect the overlapping of atomic orbitals and the distribution of electrons, leading to changes in the energy levels and stability of the bonding MOs.

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