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.
Ozarowski
Andrew
A
National High Magnetic Field Laboratory, Florida State University, 1800 E. Paul Dirac Drive, Tallahassee, Florida 32310, USA. ozarowsk@magnet.fsu.edu