<P>A series of group 4 metal complexes containing [6-isopropyl-3-methyl-2-(4-R-4,5-dihydrooxazol-2-yl)phenol] ligands, N,O-(Oz<SUP>R</SUP>–O<SUP>Ph</SUP>) [Oz<SUP>R</SUP> = oxazolyl; R = iPr (4), tBu (5)...
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https://www.riss.kr/link?id=A107597766
2009
-
Chelates ; Chiral ligands ; Group ; metals ; Helical structures ; N ; O ligands
SCOPUS,SCIE
학술저널
1435-1441(7쪽)
0
상세조회0
다운로드다국어 초록 (Multilingual Abstract)
<P>A series of group 4 metal complexes containing [6-isopropyl-3-methyl-2-(4-R-4,5-dihydrooxazol-2-yl)phenol] ligands, N,O-(Oz<SUP>R</SUP>–O<SUP>Ph</SUP>) [Oz<SUP>R</SUP> = oxazolyl; R = iPr (4), tBu (5)...
<P>A series of group 4 metal complexes containing [6-isopropyl-3-methyl-2-(4-R-4,5-dihydrooxazol-2-yl)phenol] ligands, N,O-(Oz<SUP>R</SUP>–O<SUP>Ph</SUP>) [Oz<SUP>R</SUP> = oxazolyl; R = iPr (4), tBu (5); O<SUP>Ph</SUP> = phenolate] was prepared. The reaction of the lithium salts of compounds 4 and 5 with MCl<SUB>4</SUB>, (M = Ti, Zr, Hf) in 2:1 ratio afforded the corresponding hexacoordinate metal complexes of the types [{N,O-(Oz<SUP>i</SUP><SUP>Pr</SUP>–O<SUP>Ph</SUP>)}<SUB>2</SUB>MCl<SUB>2</SUB>] [M = Ti (6), Zr (7), Hf (8)] and [{N,O-(Oz<SUP>t</SUP><SUP>Bu</SUP>–O<SUP>Ph</SUP>)}<SUB>2</SUB>MCl<SUB>2</SUB>] [M = Ti (9), Zr (10), Hf (11)], respectively. The molecular structures of 6, 7, and 8 were established by X-ray structural studies. The structures showed a helical screw-shaped molecular entity with two alternating N,O-chelating ancillary ligands and two cis-chlorido ligands at the metal centers. In the case of compound 6, chiral locking by two N,O-chelating ligands at the titanium resulted in unusual air stability. The cyclic voltammogram showed electrochemically quasireversible reduction for compound 6, whereby the half-life of the reduction state was about 3 s.</P>