Ligand effects in the substitution chemistry of cis-bis(piperidine)tetracarbonylmolybdenum(0). A molybdenum-95 NMR study

Article abstract of DOI:10.1016/0584-8539(92)80084-A

Molybdenum-95 NMR chemical shifts are reported for a series of Mo(0) compounds of the type Mo(CO)4(pip)_2-nL_n (n=1,2; L=substituted pyridine ligands).The δ(95Mo) values correlate well with the pK_a values for the substituted pyridines; for the n=1 series, Δ(95Mo) ranges from -1053 ppm (pK_a=1.86 for 4-CN) to -1120 ppm (pK_a=9.61 for 4-NMe2).The effects of solvent polarity and some in situ reactivity studies are described and the nature of the Mo-L bond compared to that with piperidine and some other ligands is discussed.