Question

can anyone please confirm my answers for 5&6? And can you explain how to fill in the electrons for 7? Please and Thank you.

5. The values of A, for some coordination complexes are given below. (a) [Fe(ox)) --- 14,100 cm-1 (ox-oxalato ligand-----weak ligand] (b) [Fe(CN).-----35,000 cm ©) [Fe(CN)6]* -----33,800 cm (1) Explain reason(s) why A. of complex (a) and (b) are different (ii) Explain reason(s) why 4, of complex (b) and (c) are different 6. Answer the following questions based on [Fe(H2O)]- complex. Aqua is a weak field ligand so a high spin complex is expected. (a) Draw the crystal field splitting diagram. You must fully label the diagram and orbitals must be filled with electrons. (b) Calculate the crystal field stabilization energy (c) Write electron configuration (d) State if the complex is paramagnetic or diamagnetic. 7. Given below is the molecular orbital diagram for octahedral complex V(HO)]" Fill orbitals with electrons for this complex

Answer 1

5.

i) in a is
[Fe (or),]'
and b is
[Fe(CN)13-
the ligands are oxilate and cyanide. In these two cyanide is strong field ligand so crystalfeild splitting enegry is more in octahedral comples in case of strong field ligand so b has more energy then a.

ii) in b
[Fe(CN)13-
and c is  
[Fe(CN):14
in these both, number of unpaired electrons are more in b than c so CFSE is more in b than c. So b is more than c due to more unpaired electrons.

6.

a) in
[Fe (H2013-
iron has oxidation state is $Fe^{^{+3}}$ so valace configuration is
3Ꮞs
  number of unpaired electrons are 5. here the ligand is weak field ligand so the crystal feild splitting diagram is attached here
& Energy diagram for fe is eg ORSE cg+trg tig ý 3 Crystal field stabilization energy NDODCCCCCCCCCCFFFFEEEEEEETTI- CESE = -0.4x n (teg) + 0.6 x n (eg) = -0.4x 3 + 0,6x2 = – 1.2 + 1.2 CESE - -3 o Elechonie Configuration for 'Fe Chao)] is (d) so it į It ý having unpaired electrons para magnetic substance.

TO [V CH420),7 * Oxidation State of vy = y +3. Electronic configuration for 1+3 = 32 uso neg egtig Toto 1 tzg

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