Methylene Walsh diagram

The methyl group was just a start. Let s now use the same procedure for the CH2 group. Our goals are the same as they were with CH3 define the group orbitals and examine how electron population leads to differing structures. Figure 1.9 shows the Walsh diagram for methylene, where we consider the relationship between the linear and bent forms. 

Fig. 3. Walsh correlation diagrams, a State energy levels for methylene (Jordan and Longuet-Higgins, 1962). 6 MO levels after Walsh (1963). c MO levels after Atkins and Symons (1967) and Hayes (1966) above the break, ci-type orbitals have been included their effect on the energy of some MO s is indicated by the small arrows.

Bender, C. F Schaefer, H. F, III Franceschetti, D. R. Allen, L. C. Singlet-triplet energy separation, Walsh-Mulliken diagrams, and singlet d-polarization effects in methylene, J. Am. Chem. Soc. 1972, 94, 6888-6893. 

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