“…Experimental data concerning the molar bond dissociation enthalpy of the enolic hydrogen of b-diketones, D m (O-H, Hbdik, enol, g), are not available, and has been subject of several estimations [9,18,43]. In this paper, we assume for both b-diketones the value derived by Sharp and Richardson [44], (368 ± 25) kJ AE mol À1 , for the D m (O-H, Hbdik, enol, g) in order to derive the AED m ae(Ni-L) and, from that, the mean molar nickel to oxygen bond dissociation enthalpies.…”