The AH2 Walsh Diagram

Interactive Walsh diagrams for AH2 AH and AH4 orbitals and energy lev eU as a function of the geometry. 

The 0cH-orbital consists essentially of an s-orbital on carbon. s-Orbitals are spherical and therefore overlap equally well with ligand orbitals in any direction. The energy of the a H is therefore largely unaffected by the change from a bent to a linear geometry. The jtcH2 other hand. 

Singlet methylene, the molecule used to derive the MOs in Sect. 2.4.1, has six valence electrons. These occupy the lowest three MOs, the the jtcH2 the n. As described above, the preference for a bent 

Triplet methylene has a larger H-C-H angle than the singlet because the n-orbital is only singly occupied and therefore half as important energet- 

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