摘要:
Molybdenum-95 NMR chemical shifts are reported for a series of Mo(O) compounds of the type Mo(CO)4(pip)(2-n)L(n) (n = 1, 2; L = substituted pyridine ligands). The delta(Mo-95) values correlate well with the pK(a) values for the substituted pyridines; for the n = 1 series, delta(Mo-95) ranges from - 1053 ppm (pK(a) = 1.86 for (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.