The title binuclear Cu(II) complex, [Cu(2)(CH(3)CO(2))(4)(C(5)H(4)Cl(2)N(2))(2)], is disposed about a crystallographic inversion center, located at the mid-point of the Cu-Cu connecting line. The Cu⋯Cu distance is 2.6600 (6) Å and each metal atom exhibits a Jahn-Teller-distorted octa-hedral geometry.

Because of the competition between the spin-orbit coupling and the Jahn-Teller (JT) energies in Fe(II)Fe(III) bimetallic oxalates, we theoretically predict that an undistorted phase with C3 symmetry about each Fe site may be recovered at low temperatures. Both lower and upper JT transitions bracketing the ferrimagnetic transition temperature Tc are predicted for compounds that exhibit magnetic ...

BY A. CEULEMANS1,*, E. LIJNEN1, P. W. FOWLER2, R. B. MALLION3 AND T. PISANSKI4 1Division of Quantum Chemistry and Physical Chemistry, Department of Chemistry, K.U. Leuven, Celestijnenlaan 200F, Heverlee 3001, Belgium 2Department of Chemistry, University of Sheffield, Sheffield S3 7HF, UK 3School of Physical Sciences, University of Kent, Canterbury CT2 7NH, UK 4Faculty of Mathematics and Physics...

The historical development and theories explaining the Verwey transition in Magnetite are discussed. An overview of current experimental work is included. Also examined are multiple charge ordering theories and more sophisticated considerations of Jahn-Teller effects which attempt to explain this long-standing problem in strongly-correlated electron systems.

1 Immunohistochemical pitfalls in the demonstration of insulindegrading enzyme in normal and neoplastic human tissues RAZVAN T. RADULESCU, ANGELIKA JAHN, DANIELA HELLMANN, AND GREGOR WEIRICH Clinical Research Unit, Department of Obstetrics and Gynecology, Klinikum rechts der Isar, Technical University of Munich, Ismaninger Str. 22, 81675 Munich, Germany Institute of Pathology, Technical Univers...