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C2-symmetric group 4 metal complexes adorned with chiral N,O chelates: Synthesis and structural characterization of helical hexacoordinate metal dichlorides derived from 6-isopropyl-3-methyl-2-(4-isopropyl-4,5- dihydrooxazol-2-yl)phenol ligands

Title
C2-symmetric group 4 metal complexes adorned with chiral N,O chelates: Synthesis and structural characterization of helical hexacoordinate metal dichlorides derived from 6-isopropyl-3-methyl-2-(4-isopropyl-4,5- dihydrooxazol-2-yl)phenol ligands
Authors
Lee J.-D.Kim T.-J.Han W.-S.Han S.J.Lee C.Ko J.Kang S.O.
Ewha Authors
이종목
SCOPUS Author ID
이종목scopus
Issue Date
2009
Journal Title
Zeitschrift fur Anorganische und Allgemeine Chemie
ISSN
0044-2313JCR Link
Citation
vol. 635, no. 41527, pp. 1435 - 1441
Indexed
SCI; SCIE; SCOPUS WOS scopus
Abstract
A series of group 4 metal complexes containing [6-isopropyl-3-methyl-2-(4- R-4, 5-dihydrooxazol-2-yl)phenol] ligands, N,O-(OzR-Oph) [OzR = oxazolyl; R = iPr (4), tBu (5); Oph = phenolate] was prepared. The reaction of the lithium salts of compounds 4 and 5 with MCl4, (M = Ti, Zr, Hf) in 2:1. ratio afforded the corresponding hexacoordinate metal complexes of the types [{N,O-(OziPr-O ph)}2MCl2] [M = Ti (6), Zr (7), Hf (8)] and [{N,O(OztBu-Oph)}2MCl2] [M = Ti (9), Zr (10), Hf(11)], respectively. The molecular structures of 6, 7, and 8 were established by Xray 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. © 2009 Wiley-VCH Verlag GmbH & Co. KGaA.
DOI
10.1002/zaac.200801385
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자연과학대학 > 화학·나노과학전공 > Journal papers
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