The synthesis of ReH7(AsPh(3))(2) is reported. Surprisingly, this comp
lex appears to be a classical heptahydride and is remarkably resistant
to substitution by nitrogen and phosphorus donor ligands. The reactiv
ity of this polyhydride towards silanes and stannanes was also studied
. The new complexes, ReH6(SiPh(3))(AsPh(3))(2) and ReH6(SnPh(3))(AsPh(
3))(2), are formed with Ph(3)EH (E = Si,Sn) but ReH7(AsPh(3))(2) does
not react with chelating silanes. These products appear to be more sta
ble than their phosphine-supported analogues.