Structural conversion of a cyclic d-Penicillaminato tripalladium(II) complex by pyridine or 2-pyridinethiol

摘要: Structural conversion of a tripalladium(II) complex with chair-type Pd3S3 metallacycle, [Pd3(d-pen-N,O,S)3] (1; H2pen = penicillamine), triggered by the coordination pyridine (py) or 2-pyridinethiol (Hpyt) was reported. Treatment 1 py in water produced boat-type [Pd3(d-pen-N,O,S)(d-pen-N,S)2(py)2] 2, which two three PdII centers are each coordinated ligand through N atom. On other hand, similar treatment Hpyt induced ring-expansion to form cyclic tetrapalladium(II) twist-boat-type Pd4S4 [Pd4(d-Hpen-N,S)(d-pen-N,S)3(Hpyt-S)2(pyt-N,S)] 3, four bridged deprotonated pyt– and S atoms remaining protonated an The 1H NMR spectral monitoring reaction solution showed that structural 2 is considerably slower than 3.