Large Magnetic Anisotropy in Pentacoordinate NiII Complexes

• Published in: Chemistry : a European journal 2008-01, Vol.14 (4), p.1169-1177
• Main Authors: Rebilly, Jean-Noël, Charron, Gaëlle, Rivière, Eric, Guillot, Régis, Barra, Anne-Laure, Serrano, Marc Durán, van Slageren, Joris, Mallah, Talal
• Format: Article
• Language: eng ; jpn
• Subjects: EPR spectroscopy; macrocyclic ligands; magnetic properties; N ligands; nickel
• ISSN: 0947-6539; 1521-3765
• DOI: 10.1002/chem.200701243

Pentacoordinate complexes in which NiII is chelated by the tridentate macrocyclic ligand 1,4,7‐triisopropyl‐1,4,7‐triazacyclononane (iPrtacn) of formula [Ni(iPrtacn)X2] (X=Cl, Br, NCS) have relatively large magnetic anisotropies, revealed by the large zero‐field splitting (zfs) axial parameters |D| of around 15 cm−1 measured by frequency‐domain magnetic resonance spectroscopy (FDMRS) and high‐field high‐frequency electron paramagnetic resonance (HF‐HFEPR). The spin Hamiltonian parameters for the three complexes were determined by analyzing the FDMRS spectra at different temperatures in zero applied magnetic field in an energy window between 0 and 40 cm−1. The same parameters were determined from analysis of HF‐HFEPR data measured at different frequencies (285, 380, and 475 GHz) and at 7 and 17 K. The spin Hamiltonian parameters D (axial) and E (rhombic) were calculated for the three complexes in the framework of the angular overlap model (AOM). The nature and magnitude of the magnetic anisotropy of the three complexes and the origin of the influence of the X atoms were analyzed by performing systematic calculations on model complexes. Enforcing pentacoordination by means of the macrocyclic tridentate ligand 1,4,7‐triisopropyl‐1,4,7‐triazacyclononane (iPrtacn) leads to large and stable magnetic anisotropy in NiII complexes [Ni(iPrtacn)X2] (X=Cl, Br, NCS; see picture: C black, H white, N light blue, Ni green, X magenta). The spin Hamiltonian parameters D and E were accurately determined by complementary high‐field high‐frequency electron resonance and frequency‐domain magnetic resonance spectroscopy.