Q9.For each of the following complexes, give the electronic configuration of the

Question

Q9.For each of the following complexes, give the electronic configuration of the d - orbitals (e.g. t 2 g^ 3 eg ^1 ), indicate whether the complex is high - spin or low - spin, and give the number of unpaired electrons:

a) [Fe (H 2 O) 6 ] +2

b) [Ni( 2 O) 6 ] +2

c) [Fe(CN) 6 ] - 4

d) W(CO) 6

Q10. The drug Nipride, Na 2 [Fe(CN) 5 NO], is an inorganic complex which is used as a source of NO to lower blood pressure during surgery.

a) Provide a systematic name for the complex Na 2 [Fe(CN) 5 NO]. Note: The NO ligand in this complex is neutral and it named

Explanation / Answer

9)

a) [Fe (H 2 O) 6 ] +2 ..... Fe+2 .......t2g^3eg^1........4 unpaired electrons

b) [Ni( 2 O) 6 ] +2............... Ni+2.........t2g^6eg^2...........2 unpaired electrons

c) [Fe(CN) 6 ] - 4..................Fe+2 ......t2g^6 eg^0....0 unpaired electrons (because of strong field ligand nature of CN-)

d) W(CO) 6 ................   W(0) .......t2g^6eg^0..........0 unpired electrons (because of strong field ligand nature of CO)

10)

a)Na 2 [Fe(CN) 5 NO] ................ sodium penta cyano nitrosyl Ferrate(iii)

b) ii) slightly weaker

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