摘要:
The synthesis and characterization of RuCl(NO)L-2 (L = (PPr3)-Pr-i and (PBu2Me)-Bu-t) and RuX(NO)L-2 (X = F, CH3, OSO2CF3, and H) are reported. All are planar at Ru. Reaction of Ru(OSO2CF3)(NO)L-2 with NaBAr'(4) (Ar' = C6H3(CF3)(2)) in CH2Cl2 gives RuCl(CH2Cl)(NO)L-2(+), while in C6H5F in the presence of Me3SiC=CSiMe3, the vinylidene complex Ru[C=C(SiMe3)(2)](NO)L-2(+) is formed. The latter is a "sawhorse" structure (i.e., P's trans but NO and C=C(SiMe3)(2) cis) and stands in contrast to the oxidative addition isomer Ru(CO)(SiMe3)(C= CSiMe3)L-2 for the carbonyl analogue. The reason for the thermodynamic reversal for CO vs NO+ is discussed on the basis DFT/(B3PW91) calculations, and the calculated structure shows bending of the nitrosyl, consistent with considerable back-donation.