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A Heterobimetallic Superoxide Complex formed through O 2 Activation between Chromium(II) and a Lithium Cation
Author(s) -
Schax Fabian,
Suhr Simon,
Bill Eckhard,
Braun Beatrice,
Herwig Christian,
Limberg Christian
Publication year - 2015
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.201409294
Subject(s) - chromium , chemistry , superoxide , lithium (medication) , yield (engineering) , inorganic chemistry , medicinal chemistry , materials science , organic chemistry , metallurgy , endocrinology , medicine , enzyme
The reaction of 1,1,3,3‐tetraphenyl‐1,3‐disiloxandiol (LH 2 ) with n ‐butyllithium and CrCl 2 results in a mononuclear chromium(II) complex ( 1 ) that further reacts with O 2 at low temperatures to yield a mononuclear chromium(III) superoxide complex [L 2 CrO 2 (THF)][Li 2 (THF) 3 ] ( 2 ). The crystal structure revealed that the chromium superoxido entity is stabilized by the coordination to an adjacent lithium cation. Complex 2 thus contains an unprecedented heterobimetallic [Cr III (μ‐O 2 )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.