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

Friday, December 20, 2024

Turnbull Blue: Charge transfer from metal to metal: Colour due CTS :

Ferrous (Fe^+2) salt reacts with potassium ferricyanide to form a blue precipitate which is called Turnbull's blue. The reaction is as follows:



 Turnbull Blue: [Fe(II)]3[Fe(III)(CN)6]2


Related Question:




Prussian Blue: Charge transfer from metal to metal: Colour due CTS :

Prussian blue is formed when ferric(Fe^3) salt reacts with ferrocyanide. Here we see both oxidation states of iron but only +2 oxidation states of iron are observed to form coordination complexes with cyanide. And the other +3 oxidation state iron ions form the net coordination compound.


 Prussian Blue: (Fe(III))4[Fe(II)(CN)6]3   

Tuesday, December 10, 2024

Splitting of d-Orbital in squar planar complexes.

As the lobes of dx^2y^2 point towards the ligands , this orbital has highest energy . The lobes of dxy orbital lie between the ligands but are coplanar with them orbital is next highest energy . The lobes of dz^2 orbital point out of the plane of the complex but the belt around the centre of the orbital (which contain 1/3 of the electron density ) lies in the plane. Therefore dz^2 orbital is the next highest in energy. The lobes of dzx and dzy orbitals point out of the plane of the complex . Hence , they are least affected by the electrostatic field of the ligands. They are degenerate and lowest in energy .

What is synergic bonding , Bonding in metal Carbonyl , Bond order of M-C and C-O in synergic Bond


(1) Stretching frequency of CO is inversely proportional to negative oxidation state of central metal atom

(2) Extent of back bonding or back acceptance is directly proportional to negative oxidation state of central metal atom.

(3) M-C bond order is directly proportional to negative oxidation state of central metal atom

(4) C-O bond order is inversely proportional to negative oxidation state of central metal atom.

(5) d C-O bond length is directly proportional to negative oxidation state of central metal atom.

(6) Bond energy of C-O bond is inversely proportional to negative oxidation state of central metal atom 





Sunday, December 8, 2024

What is Hybrization and magnatic behaviour of [NiF6]-2 complex ?

[NiF6]-2 :  This is the exceptional case:
Here F^-1 work as strong field ligand due to presence of high charge hence Zeff is also high  in this complex [NiF6]-2