Zirconium complexes incorporating the new tridentate diamide ligand [(Me3Si)N{CH2CH2N(SiMe3)}2]2–(L); the crystal structures of [Zr(BH4)2L] and [ZrCl{CH(SiMe3)2}L]
摘要:
The lithium complex of the sterically demanding, polyfunctional amide ligand [(Me3Si)N-{CH2CH2N(SiMe3)}2]2-, Li2L reached with [ZrCl4(thf)2] (thf = tetrahydrofuran) to form dimeric [(ZrCl2L)2] 2, in which the ligand is facially co-ordinated in a tridentate manner. Treatment of 2 with LiBH4 or Li[CH(SiMe3)2] generated [Zr(H3BH)L] 3 and [ZrCl{CH(SiMe3)2}L] 4, respectively. Variable-temperature NMR studies on 4 give evidence for restricted rotation of both the alkyl and amino SiMe3 groups. The crystal structures of 3 and 4 have been determined.
Zirconium complexes incorporating the new tridentate diamide ligand [(Me3Si)N{CH2CH2N(SiMe3)}2]2–(L); the crystal structures of [Zr(BH4)2L] and [ZrCl{CH(SiMe3)2}L]
摘要:
The lithium complex of the sterically demanding, polyfunctional amide ligand [(Me3Si)N-{CH2CH2N(SiMe3)}2]2-, Li2L reached with [ZrCl4(thf)2] (thf = tetrahydrofuran) to form dimeric [(ZrCl2L)2] 2, in which the ligand is facially co-ordinated in a tridentate manner. Treatment of 2 with LiBH4 or Li[CH(SiMe3)2] generated [Zr(H3BH)L] 3 and [ZrCl{CH(SiMe3)2}L] 4, respectively. Variable-temperature NMR studies on 4 give evidence for restricted rotation of both the alkyl and amino SiMe3 groups. The crystal structures of 3 and 4 have been determined.
申请人:Societe de Conseils de Recherches et d'Applications Scientifiques (S.C.R.A.S.)
公开号:US06790972B1
公开(公告)日:2004-09-14
The invention relates to new compounds having an element of group 12 and having a tridentate ligand, a process for their preparation and their use in particular as a polymerization catalyst.
该发明涉及具有12族元素和三牙配体的新化合物,以及其制备过程以及它们作为聚合催化剂的用途。
The synthesis and structures of tantalum complexes that contain a triamido or a diamidoamine ligand
作者:Richard R. Schrock、Jesse Lee、Lan-Chang Liang、William M. Davis
DOI:10.1016/s0020-1693(97)05869-6
日期:1998.4
Addition of (Me3SiNHCH2CH2)(2)NH (H-3[N-3(TMS)]) or (Me3SiNH-o-C6H4)(2)NH (H-3[ArN3(TMS)]) to a solution of TaMe5 yields [N-3(TMS)]TaMe2 or [ArN3(TMS)]TaMe2, respectively. An X-ray study of [ArN3(TMS)]TaMe2 showed it to have an approximate trigonal bipyramidal structure in which the two methyl groups are in equatorial positions and the triamido ligand is approximately planar. Addition of (C6F5NHCH2CH2)(2)NH (H-3[N-3(C6F5)]) to TaMe5 yields first [(C6F5NCH2CH2)(2)NH] TaMe3, which then decomposes to [(C6F5NCH2CH2)(2)N] TaMe2. An X-ray study of [(C6F5NCH2CH2)(2)N]TaMe2 shows it to be approximately a trigonal bipyramid, but the C6F5 rings are oriented so that they lie approximately in the TaN3 plane and two ortho fluorines interact weakly with the metal. Trimethylaluminum attacks the central nitrogen atom in [N-3(TMS)]TaMe2 to give [(Me3SiNCH2CH2)(2)NAlMe3]TaMe2, an X-ray study of which shows it to be a trigonal bipyramidal species similar to the first two structures, except that the C-Ta-C bond angle is approximately 30 degrees smaller (106.6(12)degrees). Addition of B (C6F5)(3) to [(C6F5NCH2CH2)(2)NH]TaMe3 yields [(C6F5NCH2CH2)(2)NH]TaMe2}(+)B(C6F5)(3)Me}(-), the structure of which most closely resembles that of [(Me3SiNCH2CH2)(2)NAlMe3]TaMe2 in that the C-Ta-C angle is 102.0(6)degrees. The C6F5 rings in [(C6F5NCH2CH2)(2)NH]TaMe2}(+) are turned roughly perpendicular to the TaN3 plane, i.e. ortho fluorines do not interact with the metal in this molecule. (C) 1998 Elsevier Science S.A.
Zirconium complexes incorporating the new tridentate diamide ligand [(Me<sub>3</sub>Si)N{CH<sub>2</sub>CH<sub>2</sub>N(SiMe<sub>3</sub>)}<sub>2</sub>]<sup>2–</sup>(L); the crystal structures of [Zr(BH<sub>4</sub>)<sub>2</sub>L] and [ZrCl{CH(SiMe<sub>3</sub>)<sub>2</sub>}L]
作者:F. Geoffrey N. Cloke、Peter B. Hitchcock、Jason B. Love
DOI:10.1039/dt9950000025
日期:——
The lithium complex of the sterically demanding, polyfunctional amide ligand [(Me3Si)N-CH2CH2N(SiMe3)}2]2-, Li2L reached with [ZrCl4(thf)2] (thf = tetrahydrofuran) to form dimeric [(ZrCl2L)2] 2, in which the ligand is facially co-ordinated in a tridentate manner. Treatment of 2 with LiBH4 or Li[CH(SiMe3)2] generated [Zr(H3BH)L] 3 and [ZrClCH(SiMe3)2}L] 4, respectively. Variable-temperature NMR studies on 4 give evidence for restricted rotation of both the alkyl and amino SiMe3 groups. The crystal structures of 3 and 4 have been determined.