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Three‐Spin System with a Twist: A Bis(semiquinonato)copper Complex with a Nonplanar Configuration at the Copper( II ) Center
Author(s) -
Ye Shengfa,
Sarkar Biprajit,
Lissner Falk,
Schleid Thomas,
van Slageren Joris,
Fiedler Jan,
Kaim Wolfgang
Publication year - 2005
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.200462339
Subject(s) - copper , electron paramagnetic resonance , twist , center (category theory) , chemistry , crystallography , planar , spin (aerodynamics) , photochemistry , stereochemistry , materials science , nuclear magnetic resonance , physics , geometry , organic chemistry , computer graphics (images) , computer science , mathematics , thermodynamics
A new twist : Structural twisting by about 32° between the semiquinoneiminecopper( II ) entities in 2 caused by weak Cu–S interaction results in a different spin arrangement (↑,↓,↑) than for planar 1 (↑,↑,↓). Most revealingly, 2 has an EPR spectrum typical for a radical whereas 1 displays a signal for a Cu II center. Oxidation state distributions for the 2 2+,+,0,−,2− forms are assigned on the basis of UV/Vis/NIR spectroelectrochemistry.