Triply degenerate orbitals

For the triply degenerate orbitals t2g and flM only one of each is plotted for each of them, two further, equal orbitals exist which are oriented along the other two octahedron axes. Right energy sequence of the seven occupied bonding orbitals... 

R. C. Haddon. I think there is something special. We do need more fullerenes with triply degenerate orbitals unfortunately none have been isolated beside C60. It comes about as a result of the direct product of the t-type orbitals. 

According to the Htickel model proposed by Ceulemans and Fowler, the two extra n electrons of the neutral TigC are accommodated in a triply degenerate orbital with t symmetry. Such a situation is susceptible to geometric instability of the Jahn-Teller type. Rather than considering a small deformation toward the trigonal symmetry predicted from the epikemel principle to be the most stable,... 

Both are open-shell quintet configurations which localize four electrons over four metal atoms either on thn (2, Fig. 18a), or on THN (3, Fig. 18b). The triply degenerate orbitals 2t2 and 3t2 are intrinsically non-bonding by symmetry. Orbital 2ai is no more than weakly bonding because of the large M-M distances in THN. Mo-... 

The/ orbitals will cluster into sets according to their irreducible representations. Thus (a)/ —> A] +T +T2 in Td symmetry, and there is one nondegenerate orbital and two sets of triply degenerate orbitals, (b) / —> A2u + Tiu + T2u, and the pattern of splitting (but not the order of energies) is the same. 

FIGURE 2. Graphical representation of the methane valence orbitals q>j (equations 20) in terms of EBOs 2, based on the graph shown in drawing 18. The triply degenerate orbitals t2 are given in one of the many possible real representations... 

Scenario 6—There are Three Electrons in a Triply Degenerate Orbital... 

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