a) Consider the complexes shown below. For the six coordinate complexes, draw th

Question

a) Consider the complexes shown below. For the six coordinate complexes, draw the possible d electron configurations (high spin vs. low spin) in an octahedral ligand field. For the four coordinate complexes, draw the configurations for tetrahedral and square-planar ligand fields. b) Calculate the expected spin-only magnetic moment (?SO) for each of the configurations and determine the correct ground state by comparison with the experimentally determined values. c) Aside from experimental error, which effect not included in the spin-only approximation could account for the observed deviation? Determine the orbital degeneracy (non-degenerate, doubly degenerate or triply degenerate) of the ground state and correlate it to the observed deviations from spin-only behavior. What trend can you observe?

Explanation / Answer

Co(NH3)6 having +2 oxidation state complex will show t2g - 6 , eg-1 and hybridisation SP3d2 and high spin state, one unpaired electron and spin only magenetic moment 1.7 BM. Ammonia is a strong ligand so pairing occurs in t2g state. CoF6 having +3 oxidation state complex will show t2g - 4 , eg-2 and hybridisation SP3d2 and high spin state, four unpaired electron and spin only magenetic moment 4.9 BM. F is a weak ligand no pairing occurs. CrH2O6 having +3 oxidation state complex will showt2g - 3 , eg-0 and hybridisation SP3d2 and high spin state, three unpaired electron and spin only magenetic moment 4.0 BM. H2O is a weak ligand no pairing occurs. Fe(CN)6 having +3 oxidation state complex will show t2g - 5 , eg-0 and hybridisation d2SP3and low spin state, one unpaired electron and spin only magenetic moment 1.17BM. CN is a strong ligand pairing occurs. Fe(H2O)6 having +3 oxidation state complex will showt2g - 3 , eg-2 and hybridisation SP3d2 and high spin state, fiveunpaired electron and spin only magenetic moment 5.9 BM. H20 is a weak ligand no pairing occurs. Mn(H2O)6 having +2 oxidation state complex will show t2g-5, eg-0 and hybridisation SP3d2 and high spin state, five unpaired electron and spin only magenetic moment 5.9 BM. H20 is a weak ligand no pairing occurs. CoCl4 having +2 oxidation state complex will showt eg-4, t2g-3 and hybridisation SP3 and high spin state, three unpaired electron and spin only magenetic moment 3.87 BM. Cl is a weak ligand no pairing occurs. Note: strong ligand is present in octahedral complex splitting takes place t2g is below and eg is above. pairing occurs when strong lignad present like CN, NH3,CO but in the case of weak ligand no pairing of electrons takes place. six ligands present that is octahedral complex, four lignads are present it may be tetrahedral or square plannar.

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