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The mixed phosphine–phosphine oxide Ph2PCH2CH2P(O)Ph2 (dppeO) reacts with either trans-[PdCl2(PhCN)2], Na2[PdCl4] or trans-[PdCl2(DMSO)2] to give trans-[PdCl2{1η-Ph2PCH2CH2P(O)Ph2}2]. Treatment of the latter with the metal chlorides, MCl2 · nH2O (M = Mn, Cu, Co, Zn, Hg; n = 4, 2, 6, 1, 0, respectively) or with Me2SnCl2 or SnCl4 · 5H2O, or with UO2(NO3)2 · 6H2O or UO2(OAc)2 · 2H2O gives heterobimetallic complexes: trans-[PdCl2{μ-Ph2PCH2CH2P(O)Ph2}2MX2] · nH2O. The cobalt complex (MX2 = CoCl2) was unstable in solution (MeOH or EtOH/CHCl3), and reverts to trans-[PdCl2{1η-Ph2PCH2CH2P(O)Ph2}2] and CoCl2. trans-[PdCl2{1η-Ph2PCH2CH2P(O)Ph2}2] does not apparently react with either NiCl2 · 6H2O or CdCl2 · 2.5H2O. |
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