The extremely reactive and air-sensitive nitrosyl-ruthenium(0) species tran
s-[RuCl(NO)(PPh3)(2)] (2) oxidatively adds HCl to give the octahedral ruthe
nium(II) complex [RuHCl2(NO)(PPh3)(2)] (3). On treatment of 2 with O-2, the
five-coordinate 1:1 adduct [RuCl(NO)(eta (2)-O-2)(PPh3)(2)] (4) is formed.
The dioxygen complex has been characterised by X-ray structural analysis.
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