Dioxygen molecular orbital diagram

As can be seen from its ground-state molecular orbital diagram in Figure 4.11, dioxygen has a paramagnetic ground state. It is the only stable homonuclear diatomic molecule with this property. 

Fig. 1 Qualitative molecular orbital diagrams for the alkene fragment of benzoquinone and dioxygen highlighting the key differences in their respective frontier orbitals...

Figure t The molecular orbital diagram for the dioxygen molecule... 

The bond orders for ground-state molecular oxygen (dioxygen, 02), for superoxide ion (02 -), and for (HOOH) are 2, 1.5, and 1, respectively. Tabled provides molecular orbital diagrams for dioxygen ( g , Ag, and g+) and superoxide ion, which illustrates the biradical character of 62 (-02-) and the delocalized spin density of 02 - (one-half spin per oxygen). 

Figure 11.2. Molecular orbital diagrams for O2 and O2. The ground state normal O2 (dioxygen) = triplet ground state) has two unpaired ir-electrons (it is a biradical) and is paramagnetic. Two excited forms of singlet oxygen O2 ( A and E ) can be generated (often by light irradiation in the presence of a sensitizer). The first product in a one-electron reduction of oxygen is the superoxide ) anion. (Adapted from Sawyer, 1991.)...

Fig. 2 Molecular orbital diagram and iron-oxygen n orbitals for an octahedral ferryl model, with four equatorial amine ligands and an axial acetonitrile, illustrating a high degree of covalence and a triplet dioxygen-like electronic structure [22]...

Figure 2.7. Qualitative molecular orbital diagram for the end-on M(02)PL dioxygen adduct.(M = Fe,Co, P = porphyrin, L = NH3 or imidazole). From ref. [25], reproduced with permission of the American Chemical Society.

Fig. 7.18 Qualitative molecular orbital diagram for a side-on Mn(02)PL dioxygen adduct (reprinted with permission from [95])...

Most recent authors have discussed the bonding in dioxygen complexes in terms of molecular orbital theory. Thus Drago in his spin-pairing model for 77 complexes of cobalt proposes a M.O. diagram arising fi om the interaction of one jtg orbital of dioxy-... 

Orbital energy-level diagram for dioxygen. 1 s orbitals and the molecular orbitals formed from them are omitted for clarity. 

Oxygen exists as the diatomic molecule dioxygen, in which there is a double bond formed from the eight 2p electrons of the two oxygen atoms. The simplified diagram of Figure 7.7 shows the molecular orbitals formed from the a overlap of the two 2p orbitals that lie along the molecular axis and the n overlap of the other two sets of 2p orbitals that are perpendicular to the molecular axis. 

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