we already know that we call these pi interactions
interactions
and we're going to indicate this comes
from the pi
of the 2p so if we were to get a nice
that you'll see you will see your
electron density looks something
like that on there
so and then we draw the correlation
lines remember that they
are degenerate from each other there's
two sets of them they're just
offset by 90 degrees from each other
we can think about what happens is if we
have a
negative wave character on this side and
a positive wave character on this side
so we end up getting a degenerate kind of
of
um orbital and if they are opposite wave
characters from each other
so we have positive negative over here
and then we have a negative and a
positive here
this is going to cause destructive interference
interference
when you add those wave functions over
there so you end up getting these kinds
of orbitals down here
you get this positive um this negative
then here they actually
and then you get an antibonding interaction
interaction
and we are going to call this the pi star
star
of the 2p and we can and if it's an
anti-bonding interaction it is actually
going to
increase in energy on here
so they are higher in energy remember this
this
y-axis is energy on here
and then when you actually start to see
some nicer drawings of this you'll see something
something
like this so this is the kind of bonding
and kind of the pictures
you should be able to imagine for what's
happening in these
anti-bonding kind of orbitals
then what we can do is actually take all
of this
together and combine it into an entire
molecular orbital diagram
and when we combine it into the entire
molecular orbital diagram
we're going to draw this reaction
coordinate diagram
on here the y-axis is going to be energy
again and then we have our
um the 2s and the 2p
of one of the atoms and our 2s and the 2p
2p
of course people always ask what happens
to the 1s
the 1s remember our inner core electrons
the only thing that we are interested
are the valence electrons so when we're
only interested in the valence electrons
we can go ahead and say the inner core
electrons like the 1s
is not going to do anything so they do
not show up
on our overall molecular orbital diagram
so then we can go ahead and draw our mo
diagram in the middle
over here is is our mo's on here we can
draw our correlation lines to show where
those orbitals actually came from
and this is our sigma that comes from
the 2s
this is our sigma that comes sigma star
from r2s
so remember that the sigma star has to
be higher in energy
than the other two and then we have our 2p
2p
over here we we can form our 2p
2p
our sigma star
that is due to the 2p and we can draw
and then we can't ignore our pi bonds
that happen in there so i'm just going
to draw them in here as a back in an envelope
envelope
we have our pi star uh
molecular orbital and our pi
inner molecular orbital and those are
both to the 2p
so we can go ahead and draw our
correlation lines
from the 2p so this middle portion
represents our molecular orbital diagram
and then we can start to fill in
electrons with that
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