Question

5 The values of the spin only magnetic moments (uso)of several complexes are given below. Show how these values of uso are consistent with the structure of each complex (a) uso 2.83 for [Ni(OH2)6]2 (b) uso 0 for [Ni(CO)4 1.73 for [Cu(NH3)6]2 (d)uso 3.88 for [Co(OH2)6]2 (c) uso (e) so 5.92 for [Fe(OH2)e]* and [Mn(Br)4]2

Answer 1

(a) [Ni(OH2)6] +² Ni - [A2] 48² 3d8 Nit? 3d8 H₂O weak lig and = pairing energy X P) > Do tag NTN .: Ni+3 (tag) e reg)? ny free cleo n=2 uso = rnental = 52/2+25 eso = 2.82842 : 1 uso w 2083

B [Ni(Colu . Ni → oxido no to [Ni] [Ar] 45² 348 n=o. [free-ele08] . uso = o ( ) [CUCNH3)4] +2 cut? [Ar] 3d ". NH₃ strong lig and 1) Do>p (tag) & (eg)3 vpadl nul aut tag ": n=1 uso = 51ci+2) = 1073

& SCO (H2O)6] +2 [A2] 3d7 45² co - Cota 3d7| • H2O weak ligand in PSDO Cot2 - Hag) 5 (eg) ² = 1+2=3 = √3 (3+2) uso = v nen+2) = 515 = 308729 . uso w 3.88

[Fecottag] +3 Fet3 - 3d5 - lig and H20 weak 80 p > Do - - - - 919 191 +29 : Fe +3 – (tzg)} (eg)? n = 5 i uso = √515+2) = 5.916 ... 9 uso n 5.92

(f) [mn (Br)y] ? " mnt 305 Br ligand [A ] weak p>Do (tag) 3 (eg 2 Do 1.10 (ltzy in n=5 uso = √5(5+2) = 135 uso ~ 5092