Eur. Phys. J. B 38, 43-48 (2004)
https://doi.org/10.1140/epjb/e2004-00097-9

X-Ray magnetic circular dichroism on vanadium molecular derivatives

¹ IPCMS, CNRS-UMR 7504, Université Louis Pasteur, 23 rue du Lœss, BP43, 67034 Strasbourg, France
² LURE, UMR 130, CNRS-CEA-Université Paris Sud, 93898 Orsay, France
³ ICS, UPR 22, 6 rue Boussingault, 67083 Strasbourg, France
⁴ Laboratorio TASC, Istituto Nazionale per la Fisica della Materia, S.S. 14 km 163.5 in Area Science Park, 34012 Basovizza, Trieste, Italy
⁵ Istituto Nazionale per la Fisica della Materia and dipartimento di Matematica e Fisica, Universita Cattolica, via Trieste 17, 25121 Brescia, Italia
⁶ Department of Chemistry, Warsaw University, Al. Zwirki i Wigury 101, 02-089 Warsaw, Poland

Corresponding author: ^a kappler@ipcms.u-strasbg.fr

Received: 26 September 2003
Revised: 19 November 2003
Published online: 20 April 2004

Abstract

X-Ray Magnetic Circular Dichroism experiments have been conducted on a vanadium inorganic salt and a vanadium enamino-ketone complex. Measurements at the K edge of oxygen and nitrogen reveal the amount of magnetic moment transferred in the 2p orbitals of the ligand atoms from the magnetic V ion. Measurements at the L edge of vanadium show that the orbital moment is small and that J=L+S, contrary to the expected coupling for a 3d metal with less than five d-electrons. This surprising inobservance of Hund's third rule emphasizes the need for more detailed studies and calculations on such hybrid molecules.