Coupling constant zero magnitude

Figure 5, Low-eriergy vibronic spectrum in a electronic state of a linear triatomic molecule. The parameter c determines the magnitude of splitting of adiabatic bending potential curves, is the spin-orbit coupling constant, which is assumed to be positive. The zero on the...

The OD and OP contributions and the total value of the vicinal F-F coupling constants in cw-l,2-difluoroethene (4) and cw-l,2-difluoropropene (5) are all negative, whereas the SD and FC terms are positive, as can be seen from Table 3. The OP and SD terms are of the same order of magnitude whereas the FC terms are close to zero. 

These values also show a steady decrease in the magnitude of VpMp with the electron-withdrawing power of the R group directly paralleling the observations in octahedral complexes of zero-valent Cr, Mo, and W discussed previously. A further correlation not possible in other zero-valent complexes [except for W] is found 250) between the phosphorus phosphorus coupling constant (Vpp ) and Vb,i,p the metal-phosphorus coupling constant. 

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