Synthesis And Characterization Of Organolanthanide Complexes Supported By Guanidinate And Amidinate Ligand Their Catalytic Behavior For Polymerization

In this article. ten novel lanthanide complexes supported by guanidinate and amidinaleligands were systhesiscd and characterized. Bight complexes among them were furthercharacterized by X-ray diffraction. And the catalytic activities of some complexes for thepolymerization were tested.1 Three anion-type bis(guanidinate) monochloride lanthanide complexes. [Pr2NC(N Cy)2]2Yb(Cl)2Li(TMEDA) (1) and [(CH2)5NC(NPr)2]2Ln(Cl)2Li(TMEDA) (Ln =Yb (2). Nd(3)) (Pr = isopropyl, Cy = cyclohexyl), were prepared and characterized by elemental analysis. IR spectroscopy, 'H-NMR spectroscopy and X-ray diffraction.2 Six homoleptic guanidinate lanthanide complexes. (guan)3Ln (guan = (CyN)2CNPr2. Ln=Yb(4), Nd(5): guan = (PrN)2CNPr2. Ln = Yb(6). Nd(7): guan = (PrN)2CN(CH2)5, Ln = Yb(8), Nd(9); ). were prepared and characterized by elemental analysis, IR spectroscopy and H-NMR spectroscopy. Four of them were further determined by X-ray diffraction.3 A new two-nuclear bridged-bis(amidinate) monochloride complex {[SiMe3NC(Ph)N (CH2)3NC(Ph)NSiMe3]YbCl}2(THF)(10) was synthesized. The complex was characterized by elemental analysis, IR spectroscopy. H-NMR spectroscopy and X-ray diffraction.4 The catalytic activities of homoleptic guanidinate lanthanide complexes (4-9), for the ring-opening polymerization of caprolactone were explored. And the mechanism of the polymerization was proposed by the end group determination.5 The copolymeriztions of styrene and 4-vinyl pyridine, initiated by [(PrN)2CN(SiMe3)2]2Yb(Me)2Li(TMEDA)(11), were tested.