The zero-field-splitting parameter D in binuclear copper(II) carboxylates is negative.
High-field, high-frequency electron paramagnetic resonance measurements performed on two binuclear copper complexes, [Cu(CH3COO)2]2(H2O)2 (1) and [Cu(CH3COO)2]2(pyrazine) (2), allowed a definitive determination of the sign of the zero-field-splitting parameter D. Contrary to literature reports, that parameter is negative in each complex.
National High Magnetic Field Laboratory, Florida State University, 1800 E. Paul Dirac Drive, Tallahassee, Florida 32310, USA. ozarowsk@magnet.fsu.edu
Andrew
A
Ozarowski