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

Qualitative Analysis of Cations, We are asked to design a qualitative analy...

We are asked to design a qualitative analysis scheme that can be used to determine which cations are present in a solution containing only four of the following cations: Pb2+, Ag+,

Trace and ultratrace analysis, Trace and ultratrace analysis: The accu...

Trace and ultratrace analysis: The accuracy, precision and detection limits of flame AAS depend on how the analyte sample is introduced into the atomiser. We need to transfer

Wavelength of a spectral line for an electronic transition, The wavelength ...

The wavelength of a spectral line for an electronic transition is inversely related to: (1) The number of electrons undergoing the transition (2) The nuclear charge of the a

Chemical properties of maleic acid and fumaric acid, Chemical Properties of...

Chemical Properties of Maleic Acid and Fumaric Acid Chemically, both of the acids provide the reactions of alkenes and dibasic acids apart from that the maleic acid on heating

Evaluate the percentage ionisation of salt, (a) Which aqueous solution has ...

(a) Which aqueous solution has higher concentration 1 molar or 1 molar solution of the same  solute? Give reason. (b) 0.5g KCI was dissolved in 100g water and the solution origi

Mechanism of Methanol, What are the different mechanism to produce methanol...

What are the different mechanism to produce methanol(CH3OH)?

Nuclophilic substitution, solution A is made by dissolving sodium acetate i...

solution A is made by dissolving sodium acetate in methanol. so

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