Cooperative B-H activation by Cp* based κ2-N,S-chelated Ru(II) and Mo(II) complexes (Cp* = η5-C5Me5)

The chemistry of the Cp* based kappa(2)-N,S-chelated ruthenium complex, [Cp*RuPPh3(kappa(2)-N,S-(NC7H4S2)], 1 with different boranes has been explored. The room temperature reaction of 1 with BH3.THF and bulky boranes, such as MesBH(2) and H2BArF, led to the formation of different dihydridoborate complexes, [{kappa(3)-S,H,H-(NBH2R)(S2H4C7)}RuCp*], 2-4 (2: R = H, 3: R = Mes, and 4: R = Ar-F; Mes = 2,4,6-trimethylphenyl, and Ar-F = 3,5-bistrifluoromethyl-benzene). In contrast, the Cp* based kappa(2)-N,S-chelated molybdenum complex, [Cp*Mo(CO)(2){kappa(2)-N,S-(NC7H4S2)}], 5, yielded the agostic borate species, [Cp*Mo(CO)(2){kappa(2)-S,H-(NBH2R) (NC7H4S2)}], 6 and 7 (6: R = Mes and 7: R = Ar-F) at elevated temperatures.

Automated summary

The reaction between Cp* based ruthenium and molybdenum complexes with different boranes was investigated. The result showed that the ruthenium complexes formed various dihydridoborate complexes at room temperature, while the molybdenum complexes formed agostic borate species at elevated temperatures.