Synthesis and characterization of the dinuclear polyhydrides [Os(2)H(7)(PPh(i)Pr(2))(4)](+) and [Os(2)H(6)(PPh(i)Pr(2))(4)].
The dinuclear osmium polyhydride [Os(2)H(7)(PPh(i)Pr(2))(4)][HC(SO(2)CF(3))(2)] (1) was synthesized by the protonation of [OsH(6)(PPh(i)Pr(2))(2)] with bis(trifluoromethylsulfonyl)methane. Treatment with amine bases was not able to deprotonate 1, but reaction with potassium hydride gave the corresponding neutral polyhydride [Os(2)H(6)(PPh(i)Pr(2))(4)] (2). Single crystal X-ray diffraction revealed that 1 and 2 both crystallize in the P2(1)/c space group and are classical polyhydrides containing similar Os(mu-H)(3)Os cores with Os-Os distances of 2.5431(1) A and 2.5448(2) A, respectively. These structures represent rare examples of dinuclear osmium polyhydrides with six or more hydride ligands.
Anderson
Bradley G
BG
School of Chemical and Physical Sciences, Victoria University of Wellington, Wellington, New Zealand. andersbrad@myvuw.ac.nz
Hoyte
Sarah A
SA
Spencer
John L
JL