名称:
Platinum(II) and Palladium(II) Bis(chelate) Complexes Containing both Tri(1-cyclohepta-2, 4, 6-trienyl)phosphane, P(C7H7)3, and Dichalcogenolato LigandsDedicated to Professor Joachim Strähle on the Occasion of his 65th Birthday
摘要:
Tri(1-cyclohepta-2,4,6-trienyl)phosphane, P(C7H7)(3) ([P] when coordinated to a metal atom), was used to stabilize complexes of platinum(II) and palladium(II) with chelating dichalcogenolato ligands as [P]M(Eboolean ANDE) [E = S, boolean AND = CH2CH2, M = Pt (3a); E = S, boolean AND = 1,2-C6H4, M = Pt (5a), Pd (6a) E = S, boolean AND = C(O)C(O), M = Pt (7a), Pd (8a); E = S, Se, boolean AND = 1,2-C-2(B10H10), M = Pt (9a, 9b), Pd (10a, 10b); E = S, boolean AND = Fe-2(CO)(6), M = Pt (11a), Pd (12a)]. Starting materials in all reactions were [P]MCl2 with M = Pt (1) and Pd (2). Attempts at the synthesis of [P]M(ER)(2) with non-chelating chalcogenolato ligands were not successful. All new complexes were characterized by multinuclear magnetic resonance spectroscopy in solution (H-1, C-13, P-31, Se-77 and Pt-195 NMR), and the molecular structures of 5a and 12a were determined by X-ray analysis. Both in the solid state and in solution the ligand [P] is linked to the metal atom by the P-M bond and by eta(2)-C=C coordination of the central C=C bond of one of the C7H7 rings. In solution, intramolecular exchange between coordinated and non-coordinated C7H7 rings is observed, the exchange process being markedly faster in the case of M = Pd than for M = Pt.