Question

1. a. An important enzyme in living systems is superoxide dismutase. Superoxide dismutase gets rid of the superoxide ion, which can be damaging to other biomolecules. Superoxide has the formula O2 . Draw an energy level molecular orbital diagram for superoxide. What is the bond order? Is it paramagnetic or diamagnetic? b. Draw two dot structures for superoxide. Do any of these structures convey the same essential ideas about the O2 ion as the molecular orbital diagram? Is this structure you would have drawn for O2 if you hadn't done the MO diagram first?

Answer 1

For Superscide von (0,3): Rond order = 1 [No-Na] where No = Number of bonding electrons or number of etest und in bonding. molecular orbitals Na - Wrember of antibonding elections The wiferencide con has (8+8 +1 = 17 destrona Molecular orbital diagram of a non- StormA) Molecular (Atom B) 11K ****2*111 - 1117 T*2P, T*272 energy -11 TL 2p, T2P2 - 1L v-2P 1L (6) *25 15 is 1L - 16 15 tomic molecular Wemic Gubitans Cubitals Orbitals the molecular Orbital woonfiguration of Cz wie o 152,6*1s?, 7251, 5+25,62p., ** 2pX = TT2p3, 77*2p3 - TT* 2P2 , 6*2 på No=10, Na=7 Pond order = 1 (No - Na) = } [10-41 = 3 -1.5 Bond Order = 1.5 - The Supraside ion has unpaoud e in **2P2, So, its magnetic property wit yaramagnitis

Kupercide con Structures) A > B AK. >13 10:06 0:0 Bot structure 1 Dot Structure 2 (moleculan orbital Diagram for this dat isteructure has been drawn earlier in the solution) Wow, Molecular orbital Diagram for superoxide (02) of Dot structure 2 → (Nom A) Motorlar (tem B) +2p. 11 1 - TT*2p. T*22 1 1 2p TZpy T2P2 Energy v2P 11 { 1 2s la dela eta -{ ols Cos 111 15 - 1L Wtomic orbitale Molecular stomic Orbitalt Orbitals The Molecular Orbital configuration of or if rls, *15-25., 6*25, -2p3, **2p= T2P3, * 2 p = * 2p2 & 2px No=10, Na=7 Prond order = 1 (No-Na) = 4(10-= 3 = 1,5 Pond Order = 1.5 -

In both the cases (i) & (u) we see that the bond order of superoxide ion us 1.5. In both the molecular orbitals the last é is in * 202 wrrespective of the choice of atom A and B. This is due to the fact that molecular orbitals vare formed by overlapping of atomic orbitals, wo, if the atomic vorbitals contribute to the molecular orbitals in the same manner of filling the orbitals according to the energy levels then it is undependent of the vhoice of the molecular orbital diagram Gorli) Me molecular orbitals are formed when both the atomic orbitals combine and overlah so, ut us clear from the energy level molecular mo orbitals that these structures convey the same essential ideas vabout the 0 ion as the molecular orti orbital diagram.
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