A Heterobimetallic Superoxide Complex formed through O2 Activation between Chromium(II) and a Lithium Cation1. Issue 4 (4th December 2014)

• Record Type: Journal Article
• Authors: Schax, Fabian; Suhr, Simon; Bill, Eckhard; Braun, Beatrice; Herwig, Christian; Limberg, Christian
• Is Part Of: Angewandte Chemie international edition. Volume 54:Issue 4(2015)
• Page Start: 1352
• Page End: 1356
• Publication Date: 2014-12-04
• Subjects: Chemistry -- Periodicals; 540
• DOI: 10.1002/anie.201409294
• Languages: English
• ISSNs: 1433-7851

Abstract

<abstract abstract-type="main" xml:lang="en"> <title>Abstract</title> <p>The reaction of 1, 1, 3, 3‐tetraphenyl‐1, 3‐disiloxandiol (LH₂) with <italic>n</italic>‐butyllithium and CrCl₂ results in a mononuclear chromium(II) complex (<bold>1</bold>) that further reacts with O₂ at low temperatures to yield a mononuclear chromium(III) superoxide complex [L₂CrO₂(THF)][Li₂(THF)₃] (<bold>2</bold>). The crystal structure revealed that the chromium superoxido entity is stabilized by the coordination to an adjacent lithium cation. Complex <bold>2</bold> thus contains an unprecedented heterobimetallic [Cr^III(μ‐O₂)Li⁺] core; beyond this it is the first chromium superoxide for which a temperature‐dependent magnetic characterization could be achieved, and the first structurally characterized representative with chromium in an exclusive O‐donor environment.</p> </abstract>