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Showing posts with label COORDINATION COMPOUNDS:. Show all posts
Showing posts with label COORDINATION COMPOUNDS:. Show all posts

Thursday, April 28, 2022

Coordination Compounds or complex:

8.1 Double salt or lattice salts
8.2 Coordination or complex salts
8.3 Structure and terminology
8.4 Nomenclature of complex compounds
8.5 Type of ligands
8.5 Special ligands
8.6  Bonding  in complexes:
8.6.1(A) Werner's theory of coordination complexes:



Sunday, April 24, 2022

Compare the splitting energy (∆●) into the following compound and give appropritate reason ?

Given compounds are...
(A) [Co(NH3)6]3+ 
(B) [Rh(NH3)6]3+
(C) [Ir(NH3)6]3+
Solution :
In given compounds number of ligands, types of ligands and oxidation state is same for central atom belongs to same group but different transition series 3d, 4d and 5d respectively. We know that as move top to bottom size of d-orbital(3d--> 4d --> 5d) is increases so ligand approches to d-orbitals more closely so the repulsion
between d-orbital of metal and ligand is high and splitting energy increases.order of splitting energy [Co(NH3)6]3+ < [Rh(NH3)6]3 <[Ir(NH3)6]3+

Related Questions:












Explain the formation of Na4[Fe(CN)6] and Na4[FeF6] ? Show which is low spin and which is high spin complex and also calculate the Crystal field stablisation energy (CFSE) ?

In the given compounds CN– is strong field ligands and F– is weak field ligand and in both compounds ions is in +2 oxidation state d6 configuration.

What are bridging ligands and how to show bridging ligands in naming, explain with suitable example.

(A) If a complex ion has two or more than two metal atoms then it is termed polynuclear. The ligand which connects the two metal ions is called as Bridging ligand or Bridge group.
(B) A prefix of Greek letter (U) , is repeated before the name of each different kind of bridging group.

Friday, April 22, 2022

[Fe(CN)6]3- is weakly paramagnetic while [Fe(CN)6]4- is diamagnetic, why ?


[Fe(CN)6]3- involves  d2sp3  hybridization

Related Questions;

[Fe(CN)6]4- is diamagentic while [FeF6]4- is strongly paramagnetic.Why ?

CN- is strong field ligand and so it pairs up the electrons leading to the formation of low spin complex which is diamagnetic. [Fe(CN)6]4-

Which of the Complex of the following pairs has the largest value of CFSE?


(1) [Co(CN)6]3-  and [Co(NH3)6]3+
(2) [Co(NH3)6]3+ and [CoF6]3-
(3) [Co(H2O)6]3+  and [Rh(H2O)6]3+
(4) [Co(H2O)6]2+ and [Co(H2O)6]3+

SOLUTION:

(1)
  CN is the stronger ligand than NH3 therefore CFSE of [Co(CN)6]3-  will be more than  [Co(NH3)6]3+
(2) NH3 is stronger ligand than F therefore CFSE of [Co(NH3)6]3+ will be more than [CoF6]3- .
(3) Co belong to 3d series whereas The Rh belong to 4d series. More the value of n more is CFSE therefore CFSE of  [Rh(H2O)6]3+  is more than [Co(H2O)6]3+ .
(4) Oxidation number of Co in [Co(H2O)6]3+ is more than the Oxidation number of [Co(H2O)6]2+  therefore, CFSE of [Co(H2O)6]3+ is more than  [Co(H2O)6]2+ .


Saturday, April 16, 2022

Compare the splitting energy (CFSE) into the following compound and give appropritate reason ? [Co(NH3) 6] 3+ , [Rh(NH3) 6] 3+,[Ir(NH3) 6] 3+

In given compounds number of ligands, types of ligands and oxidation state is same for central atom belive to same group but different transition series 3d, 4d and 5d respectively. We know that as move top to bottom size of d-orbital(3d--> 4d -->5d) is increases so ligand approches to d-orbitals more closely so the repulsion between d-orbital of metal and ligand is high and splitting energy increases. 
Thus order of splitting energy 
[Co(NH3)6]3+ < [Rh(NH3)6]3+ < [Ir(NH3)6]3+

Related questions:



Wednesday, April 13, 2022

Is oxalate (C2O4)2- Weak field ligand or strong field ?


Although [Fe(CN)6]4- is more stable (EAN-36) than [Fe(CN)6]3-(EAN-35) as par EAN rule but actually [Fe(CN)6]3 is more stable than [Fe(CN)6]4- ?

Although [Fe(CN)6]4- is more stable (EAN-36) than [Fe(CN)6]3-(EAN-35) as par EAN rule but actually  [Fe(CN)6]3 is more stable than  [Fe(CN)6]4- because in  Fe+3  Zeff will be more hence bonding between Fe+3 and -CN is more effective.

Which complex is more stable [Ni(CN)4]4- or [Ni(CN)4]2- and why?

In general stability of Complexes is directly proportional to the magnitude of charge on central metal atom. Thus Complexes of Ni +2 are more stable than Ni0

[Ni(CN)4]4- < [Ni(CN)4]2- 

d3s Hybrization and it's examples.

d3s Hybridization or dxy+dyz+dxz+s  possess tetrahedral geometry  and bond angle 109'28'. And examples are as CrO2Cl2,  CrO42-, MnO41-, MnO42-
VO43-, Cr2O72-

Sunday, November 29, 2020

What are sigma-donors ligands give the examples?

 Examples of sigma (σ) – donors:


Related Questions;

(1) What type of ligands are known ?

(6) What are the chemical formula and chemical name of Glauber salt ?


What are pi-acceptors ligands give the examples?

 Examples of pi-acceptors ligands given as;


Related Questions;

(1) What type of ligands are known ?


What are pi-donors ligands give the examples?

Ligands such as OR−, F−, and Cl− are π donors as a result of the lone pairs that are left after one lone pair has formed the M−L σ bond. Instead of stabilizing the dπ electrons of a d6 ion as does a π acceptor, these electrons are now destabilized by what is effectively a repulsion between two filled orbitals. 

Examples of pi-donor ligands given as;


Related Questions;

(1) What type of ligands are known ?

(2) What is the common formula of “Prussian blue is” and “Turn bull's blue”?  

(3) What is denticity of NO and NO+ ligands ?

(4) Although both [Mn(H2O)6]2+ and [FeF6]3- have a d5 configuration and high-spin complexes. But the dilute solutions of Mn2+ and Fe +3 complexes are therefore colorless. Why?

(5)Which of the Complex of the following pairs has the highest value of CFSE?

(6) Colour of Complexes due to charge transfer: 

(7) Why violet colour of [Ti(H2O)6]Cl3 disapear (colourless) on heating heating ? 

(8) Why [Ni(CN)4]-2 is colourless while [Ni(H2O)4]-2 although both have +2 oxidation state and 3d*8 configuration ?

(9) Why [FeF6]3– is colourless whereas [CoF6]3– is coloured ? 

(10) Why Fe(CO)5 is colourless while Fe(bipy)(CO)3 is intensely purple in colour ?
Why all the tetrahedral Complexes are high spin Complexes ?


What type of ligands are known ?


Many ligands are a combination of donor types, but the “pure” donor diagrams can be considered as;

Related Questions;