Synthesis and stereochemical properties of chiral square complexes of iron(II)

被引:30
作者
Bark, T
von Zelewsky, A [1 ]
Rappoport, D
Nenburger, M
Schaffner, S
Lacour, J
Jodry, J
机构
[1] Univ Fribourg, Dept Chem, CH-1700 Fribourg, Switzerland
[2] Univ Karlsruhe, Inst Phys Chem, D-76128 Karlsruhe, Germany
[3] Univ Basel, Chem Crystallog Lab, CH-4056 Basel, Switzerland
[4] Univ Geneva, Dept Organ Chem, CH-1211 Geneva, Switzerland
关键词
chiral resolution; density functional calculations; diaster-eoselectivity; iron; molecular; squares; self-assembly;
D O I
10.1002/chem.200400399
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
The hexadentate, and ditopic ligand 2,5-bis([2,2']bipyridin-6-yl)pyrazine yields a chiral, tetrameric, square-shaped, self-assembled species upon complexation with Fe2+ ions. The racemate of this complex was resolved with antimonyl tatrate as the chiral auxiliary. The purity of the enantiomer was determined by NMR spectroscopy, by using a chiral, diamagnetic shift reagent, and by circular dichroism (CD). The CD spectrum was also calculated by time-dependent density functional theory, and the correlation that was found between CD spectrum and configuration was confirmed by X-ray cristallography. When a "chiralised" version of the ligand was used instead, the corresponding iron complex was obtained in diastereomerically pure form.
引用
收藏
页码:4839 / 4845
页数:7
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