Jue Chen

Synthesis and crystal structure of (C5Me4SiMe3)[(iPrN)2CCH2SiMe3]2Y

Reaction of (C 5 Me 4 SiMe 3 )Y(CH 2 SiMe) 2 (THF) with two equivalents of i PrN=C=N i Pr in hexane at room temperature afforded a mixed-ligand yttrium complex (C 5 Me 4 SiMe 3 )[( i PrN) 2 CCH 2 SiMe 3 ] 2 Y. X-ray diffraction revealed that the center metal was nine-coordinated by one cyclopentadienyl ring and two amidinate ligands, and adopted a four-legged piano stool geometry.

Synthesis, characterization, and styrene polymerization performance of organo yttrium complexes supported by imino-fuctionalized indenyl ligand

ABSTRACT Amine elimination of Y[N(SiHMe2)2]3(THF)2 with the imino-functionalized indenyl ligand C9H7CH2CH = N-2,6-iPr2C6H3 in 1:1 and 1:2 molar ratio afforded the mono-indenyl-ligated yttrium bis(silylamide) complex (C9H6CH2CH = N-2,6-iPr2C6H3)Y[N(SiHMe2)2]2 (4) and the neutral yttrium complex (C9H6CH2CH = N-2,6-iPr2C6H3)(C9H6CH = CH-N-2,6-iPr2C6H3)Y (5), respectively. Both complexes were characterized by elemental analysis and NMR. X-ray single crystal structural diffraction showed that the central metal in 5 is four-coordinated by two indenyl ligands and two nitrogen atoms in η5/κ1-mode, if the indenyl ring is regarded as occupying an independent vertex. In the presence of AliBu3 and activated by one equimolar amount of [Ph3C][B(C6F5)4], complex 4 showed activity toward syndiospecific polymerization of styrene.