Chromium complexes coordinated with chelating disiloxane-1,3-diamido ligands as catalyst precursors for ethylene polymerization
2002; Elsevier BV; Volume: 642; Issue: 1-2 Linguagem: Inglês
10.1016/s0022-328x(01)01258-x
ISSN1872-8561
AutoresHaruhiko Ikeda, Takashi Monoi, Yuushou Nakayama, Hajime Yasuda,
Tópico(s)Synthesis and characterization of novel inorganic/organometallic compounds
ResumoReaction of CrCl2 with 0.5 equivalents of Li4[(NtBuSiMe2)2O]2 (1) gave a new chromium(II) complex, Cr2[(NtBuSiMe2)2O]2 (2). Similar reaction of CrCl3 with 1 yielded the corresponding chromium(III) complex, Cr2[(NtBuSiMe2)2O]3 (3). The dinuclear structure of 3 was revealed by X-ray crystallography, in which the disiloxanediamido ligand can be regarded as an N,N-bidentate ligand. The complexes 2 and 3 showed relatively high catalytic activities for ethylene polymerization upon activation with diethylaluminum chloride.
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