vector mechanics

Aug 16th, 2016
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CYL 100 General ChemistryInorganic PartByS. NagendranSNdDepartment of ChemistryIIT DelhiLecture-02Crystal Field Stabilization Energy(CFSE)Let us take the d1 system first and discuss about it:The configuration is t2g1eg0 (1 unpaired paired electron (upe) and theelectron that occupies the t2g orbital has an energy of 0.4 o relative tothe barycenter.Crystal Field Stabilization Energy(CFSE)The ()ive sign indicates that the complex is stabilized to an extend of0.4 o in comparison to the hypothetical spherical field. It is called as thecrystal field stabilization energy (CFSE)3 isW saw thatWeh theh o forf [Ti(H2O)6]3+i 2434 KJ/mol.KJ/ l Therefore,Th fi CFSE =its0.4 x 423 KJ/mol = 97 KJ/molSimilarly the CFSE can be worked out for other cases alsoSimilarly,Crystal Field Stabilization Energy(CFSE)d2 systemCFSE = 0.8 ot2g2eg0 (2 upe)d3 systemt2g3eg 0 (3 upe)CFSE = 1.2 oCrystal Field Stabilization Energy(CFSE)Nevertheless, in d4 system, there are two possibilities on the basis of therelative values of o and pairing energy (P)Weak Field(or)High Spin (HS)Strong Field(or)LLowSpinS i (LS)o > Po < Pt2g3eg1 (4 upe)pt2g4eg0 (2 upe)pCFSE = 1.2 o + 0.6 oCFSE = 1.6 o + 1 P= 0.6 oCrystal Field Stabilization Energy(CFSE)d5 systemHS, o < PLS, o > Pt2g3eg2 (5 upe)t2g5eg0 (1 upe)CFSE = 1.21 2 o + 1.21 2 oCFSE = 2.02 0 o + 2 P= 0

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