Cooperative B-H activation by Cp* based κ 2 - N , S -chelated Ru(II) and Mo(II) complexes (Cp* = η 5 -C 5 Me 5 ).

The chemistry of the Cp* based κ 2 - N,S -chelated ruthenium complex, [Cp*RuPPh 3 (κ 2 - N,S -(NC 7 H 4 S 2 )], 1 with different boranes has been explored. The room temperature reaction of 1 with BH 3 ·THF and bulky boranes, such as MesBH 2 and H 2 BAr F , led to the formation of different dihydridoborate complexes, [{κ 3 - S,H,H -(NBH 2 R)(S 2 H 4 C 7 )}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 κ 2 - N,S -chelated molybdenum complex, [Cp*Mo(CO) 2 {κ 2 - N,S -(NC 7 H 4 S 2 )}], 5, yielded the agostic borate species, [Cp*Mo(CO) 2 {κ 2 - S,H -(NBH 2 R) (NC 7 H 4 S 2 )}], 6 and 7 (6: R = Mes and 7: R = Ar F ) at elevated temperatures.