Spectroscopic Investigations of Bis(sulfoximine) Copper(II) Complexes and Their Relevance in Asymmetric Catalysis

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• 作者：Carsten Bolm ; Marc Martin ; Georg Gescheidt ; Cornelia Palivan ; Dmytro Neshchadin ; Helmut Bertagnolli ; Martin Feth ; Arthur Schweiger ; George Mitrikas ; and Jeffrey Harmer
• 刊名：Journal of the American Chemical Society
• 出版年：2003
• 出版时间：May 21, 2003
• 年：2003
• 卷：125
• 期：20
• 页码：6222 - 6227
• 全文大小：125K
• 年卷期：v.125,no.20(May 21, 2003)
• ISSN：1520-5126

文摘

The structure of Cu(II) complex 3 formed within the course of a stereoselective Diels-Alderreaction was investigated by EXAFS, CW-EPR at X- and W-band, HYSCORE, pulsed ENDOR, and UV-vis spectroscopy. The experimental techniques indicate that the chiral bis(sulfoximine) ligand (S,S)-1 andthe dienophile form a tetragonally distorted complex in CH₂Cl₂. The ligand binds to the Cu(II) center via theimine nitrogens, whereas the dienophile interacts via the carbonyl oxygen atoms. The additional sites ofthe first coordination sphere are occupied by counterions and, presumably, solvent molecules. At the axialposition, a triflate anion binds via an oxygen atom.