.eta.2-Dihydrogen on the brink of homolytic cleavage: trans-[Os(H.cntdot..cntdot..cntdot.H)H(PEt2CH2CH2PEt2)2]+ has spectroscopic and chemical properties between those of the isoelectronic complexes trans-[OsH(PPh2CH2CH2PPh2)2(.eta.2-H2)]+ and ReH3(PPh2CH2CH2PPh2)2

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