Technetium hydride complex

The first and only nitrosyl hydride has been prepared recently by the reduction of the complex MnBr(NO)2(PPh3)2 with sodium boro-hydride (170). It may be noted that reduction of the nitrosylcarbonyl (ir-C5H5)Cr(CO)(NO)Br does not give a Cr—H complex. A possible polynuclear technetium hydride [Tc(CO)4]3H has been discussed (186). Reduction of the complex CH3SCH2CH2SCH3Mo(CO)3l2 affords an unstable hydride (215). 

The formation of the hydrides may proceed via bis(jr-cyclopentadienyl)-metal halide complexes, since compounds such as (ir-CeH ReCU+CI-and (t-CjHOjWCU are known and are readily reduced to the neutral hydrides on treatment with lithium aluminum hydride 64) (Eq. 5). Treatment of technetium tetrachloride with sodium cyclopentadiene does not give a hydride analogous to that of rhenium. Molecular weight determina-... 

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