Illustrate crystal field splitting in octahedral complexes, Chemistry

Assignment Help:

Q. Illustrate crystal field splitting in octahedral complexes?

Initially in a free ion state (I) all the orbitals are in degenerate state. In state (11), all the five orbitals are raised m energy when surrounded uniformly by negative charges. State (111) shows how the degeneracy is removed in an octahedral field. The set of lower three orbitals equal in energy in an octahedral field is given symbols t2g while the upper two equal-energy levels are denoted by e,. The difference in energy between t2g and eg sets is given by a symbol D0, (delta octahedral). Comparing states (11) and (III), we find that the only difference between them is that instead of uniformly distributing the six negative charges (as shown in state II), we have put the six charges at the comers of a regular octahedron. Just by the redistribution of charges the total energy of the system should not change. However, at the same time we say that in state (111). the t2g set of orbitals will be  lower in energy and the eg set will be higher. The two facts can be reconciled if the total lowering of 12 set is equal to the total raise in energy of eg orbitals which would give no resultant change in energy as compared to state (11). Of the five orbitals, three are lowered in energy and two are raised in energy. Thus each orbitals is lowered in energy by 2/5D0,    causing a total lowering of 615 & the other two orbitals are each raised in energy by 3/5D0,   causing a total raise of 6/5 D0,. The sum total of lowering and raise, being equal and opposite, turns out to be zero or no change. The D0, values are generally in the range of 100-250 kJ mol-1.


Related Discussions:- Illustrate crystal field splitting in octahedral complexes

Mahendra, transition elements form coloured compound. Why?

transition elements form coloured compound. Why?

Rapid filter cleaning , 1. In water softening, which of the precipitates wi...

1. In water softening, which of the precipitates will settle out? 2. For particle sizes larger than 1μ in size 3. In non-ideal type II settling 4.The most usually used me

Project, to study the presence of aroma,taste, ph value and tannic acid of ...

to study the presence of aroma,taste, ph value and tannic acid of different tea leaves

What do you mean by emulsions, Q. What do you mean by Emulsions? Emulsi...

Q. What do you mean by Emulsions? Emulsions, as you may already know by now, are colloidal dispersions of a liquid in another liquid with which it is immiscible. Emulsions can

Urea or carbamide - carboxylic acids, Urea or Carbamide  - Carboxylic acid...

Urea or Carbamide  - Carboxylic acids Urea may be referred like a diamide of an unstable and dibasic carbonic acid by which both the hydroxyl groups have been changed by -NH 2

., why we consider carbon as standared for atomic mass unit

why we consider carbon as standared for atomic mass unit

Dislocations - linear defects, Dislocations-Linear Defects           Di...

Dislocations-Linear Defects           Dislocations are abrupt alters in the regular ordering of atoms, along a line (dislocation line) in the solid. They occur in high density a

Continuous lime-soda process, Q. Describe Lime-soda method for softening ...

Q. Describe Lime-soda method for softening of hard water. Discuss the advantages of the process and the chemistry involved in it.

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd