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首页> 外文期刊>Zeitschrift fur Anorganische und Allgemeine Chemie >C-2-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
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C-2-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

机译:带有手性N,O螯合物的C-2-对称的第4组金属配合物:衍生自6-异丙基-3-甲基-2-(4-异丙基-4,5-二氢恶唑-2)的螺旋六配位金属二氯化物的合成和结构表征-基)酚配体

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摘要

A series of group 4 metal complexes containing [6-iso-propyl- 3-methyl-2-(4-R-4,5-dihydrooxazol-2-yl)phenol] ligands, N,O-(Oz(R)-O-Ph) [Oz(R) = oxazolyl; R = iPr (4), tBu (5); O-Ph = 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-(Oz(iPr)-O-Ph)}(2)MCl2] [M = Ti (6), Zr (7), Hf (8)] and [{N,O-(Oz(tBu)-O-Ph)}(2)MCl2] [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.
机译:一系列含有[6-异丙基-3-甲基-2-(4-R-4,5-二氢恶唑-2-基)苯酚]配体,N,O-(Oz(R)- O-Ph)[Oz(R)=恶唑基; R = iPr(4),tBu(5);制备[O-Ph =酚盐]。化合物4和5的锂盐与MCl4(M = Ti,Zr,Hf)按2:1的比例反应,得到相应类型的六价金属配合物[{N,O-(Oz(iPr)-O -Ph)}(2)MCl2] [M = Ti(6),Zr(7),Hf(8)]和[{N,O-(Oz(tBu)-O-Ph)}(2)MCl2] [M = Ti(9),Zr(10),Hf(11)]。通过X射线结构研究确定了6、7和8的分子结构。结构显示出螺旋螺旋状分子实体,在金属中心具有两个交替的N,O-螯合辅助配体和两个顺-氯代配体。在化合物6的情况下,两个N,O螯合配体在钛上的手性锁定导致异常的空气稳定性。循环伏安图显示化合物6的电化学准可还原还原,其中还原态的半衰期约为3 s。

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