Coordination Polyhedron, Oxidation Number of Central Atom Video Lecture - NEET

hello friends this video on coordination
component part 6 is brought to you by
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till our centre of attraction vs Liggins
so let's sift the gear and put let's
make the central atom as the center of
attraction okay let's talk about the
coordination by in fact we discuss
coordination number something about my
secondary valency and that is nothing
but total number of ligands total number
of ligands bound into given metal ion
that is called coordination number okay
this is nothing but equals the number of
core daeun bond present in the complex
for example in this case cobalt is
linked to six ammonia molecules
coordination number of six in this case
when this is linked to six atoms only
one linking by six atoms coordination
blissful in six this case nickel is
linked to one two three four five six
atoms six please note in this case this
metal is linked to only one ligand but
the coordination number is six in this
case the metal is linked to one two
three four Lincoln but the coordination
of mystics where the coordination is
nothing but the number of coordinate
bond is it in this case also nickel is
linked to only two ligands
one ligand one again the coordination
but here also is since the ball is
nickel is attached to there are six
different watch in the example for
example I take n I finish three four so
in this case the niccola - two for
ammonia molecules coordination number
will be four okay let's take this guy
covant let's go there is a en molecule
here this is maryam illegal here nobody
in me needles we will see the structure
so in this case one part is linked to
three
this is bidented ligand there 6.3 ligand
six one since there are six one
coordination number is six so please
note the coordination number depends on
the number of bonds not depends on the
number of ligands there is no definition
there is no term used for the number of
ligands bonded to a that is not that
it's always the number of bonds okay and
please note the coordination number of a
central atom is it reminded by the
number of Sigma bond the bond mischenko
here is the Sigma bond if there is a pi
bond so that PI bond is not constant
it's always Sigma bond the PI bond is
red but if there is the PI 1 is not in
construction then we have coordination
polyhedron I think we have told that
coordination polyhedron is nothing but
the spatial arrangement of the ligands
in the space three-dimensional space how
they look how they are arranged that is
called coordination for you intron okay
special arrangement of the ligand Adam
natural arrangement in the space
arrangement in the space of licking
atoms living atoms directly attached to
please note when you talk about the
coordination polyhedron you don't talk
about the continents you talk only about
the ligands and the central atoms this
is the ligand and in the center even if
it has charge you put a charge here and
there will be some ions counter ions but
confines are not part of the
coordination polyhedron please note that
for example I have zero NH three shakes
VA 3 so the CL 3 is not part of the
coordination person will talk only about
this without blasting charge ok the most
conscious name is octahedral
this is tetrahedral square planar primal
by pyramidal squadron actually the most
common is first three but these two also
exist that is the most common example
octahedron example can be this one Co NS
3
but I told see the CL 3 will be ignored
so what I'll be writing is Cu in his 3 6
mm this is example of off title then
we'll take some numerical tray will
decide and will tell you how to find our
shape tetrahedral example will be Nico 4
so we can try and square planar will be
example VPD 4 plus this is a the example
which we will talk about that how to
find that this understand this term is
for coordination polyhedron is nothing
but special arrangement of ligands
attached directly loose until atom here
we don't talk about those counter ions
okay next time we use is the oxidation
number of central atom so here we use
the simple logic which we use should
find the coordination number for any
compound so coordination number is by
definition is nothing but the chart the
central atom this is the central atom
this discharged the central atom would
carry if all the legends were remove
with the electrons pair that they have
shared for example in this case the
charge on this will be plus T because
this ammonia has zero charge the net
charge plus 3 so part will have plastic
charge in show you how example you take
Co violence X charge and 6 linear
molecules we want to charge 0 total
charge will be the net charge and it's
plus 3 you saw this you could excess
plus similarly take more examples see
you see in for 3 minutes here I have to
find this charge in copper so let's
suppose copper charge
X
plus CN minus 4 CN minus VC minus s
minus 1 charge to charge is minus 3 you
solve this it takes s plus 2 copper will
have oxidation number of plus similarly
let's take an example ft c + 6 with
minus charge let's assume the charge
iron is x CL 6 CN e C and n minus 1
charge it's filled in what charges - 4
saw this excess plus okay so let's
understand this term homoleptic and
hetero elliptic complex PD eg terms see
the complex in which the metal is born -
only one kind of donor is called the
homo means same right home only
homogeneous so you see in this case this
metal is bonded to our same donor okay
will you one kind of the hunter is gone
home or lipstick likes complex in which
the metal is born - more than one kind
of donor in central this is thrown in
here in here ammonia so I have two
different type of four ligands here
right this is gone
hit proleptic context it easy complex in
which the metal is bound to only one
kind of donor group is called homoleptic
complex complex in which the metal is
bound to more than one kind of donor
group is called hetero elliptic costs
okay thank you
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