An empirical correlation between the magnitude of VPB and dative bond strength is evident for the BH3 adducts of a series of smoothly varying phosphine ligands such as F3-"H"P->-BH3, Me3_"H"P-»-BH3, (Me2N)3_"-F"P-*BHS, and F2XP->-BH3 (X = F, Cl, Br). It is not known if the correlation can be quantified, and it does not appear to be general for cases where the ligands belong to different series. A similar correlation is not possible when the acid is smoothly varied and the ligand held constant in the series Me3P-*BX3 (X = F, Cl, Br, H). Relative sign determinations for Me3P->BF3, Me3P->BH3, F2HP-BH:i,and (Me2N)F2P-BH3all indicate a positive sign for Vpb.
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