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Carbenes electron repulsion energy

For a silylene to have a triplet ground state, the one-electron promotion energy attendant upon moving one of the lone-pair electrons of the singlet to the p-orbital must be offset by the decrease in the repulsion upon separation of the nonbonding electrons. For the majority of carbenes. [Pg.16]

Such a linear carbene would have six electrons to distribute amongst two o orbitals and two (higher-energy) p orbitals. The two electrons in the degenerate p orbitals would remain unpaired because of electron repulsion in the same way as in molecular oxygen 0-0°. sp hybridized C atom linear carbene two H atoms... [Pg.1060]

In the table on p. 1060 we saw that the substituents on the carbene affect which of the two classes (which we now call singlet and triplet) it falls into. Why Most type of carbenes are more stable as triplets because the energy to be gained by bringing the electron in the p orbital down into the sp2 orbital is insufficient to overcome the repulsion that exists between two electrons in a single orbital. [Pg.1062]

In a singlet state a or p carbene, the electron-electron coulomb repulsion would be severe, since two electrons are constrained to the same small MO. On the other hand, the triplet configuration is stabilized by relief of the coulomb repulsion and exchange repulsion however, the separation of electrons into different MOs does not come without a cost. Thus, the magnitude of the energy difference between the triplet and singlet states (the singlet-triplet split-... [Pg.106]


See other pages where Carbenes electron repulsion energy is mentioned: [Pg.355]    [Pg.65]    [Pg.156]    [Pg.903]    [Pg.229]    [Pg.233]    [Pg.353]    [Pg.617]    [Pg.377]    [Pg.505]    [Pg.521]    [Pg.114]    [Pg.114]    [Pg.353]    [Pg.114]    [Pg.107]    [Pg.617]    [Pg.433]    [Pg.714]    [Pg.230]    [Pg.231]    [Pg.5]    [Pg.332]    [Pg.194]    [Pg.277]    [Pg.116]    [Pg.116]    [Pg.2505]    [Pg.320]    [Pg.397]    [Pg.194]    [Pg.173]    [Pg.116]    [Pg.101]    [Pg.116]    [Pg.1012]    [Pg.753]    [Pg.156]    [Pg.281]   
See also in sourсe #XX -- [ Pg.156 ]




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