Syntheses, X-ray Structures, Solid State High-Field Electron Paramagnetic Resonance, and Density-Functional Theory Investigations on Chloro and Aqua MnII Mononuclear Complexes with Amino-Pyridine Pentadentate Ligands.
The two pentadentate amino-pyridine ligands L25 and L35 (L25 and L35 stand for the N-methyl-N,N',N'-tris(2-pyridylmethyl)ethane-1,2-diamine and the N-methyl-N,N',N'-tris(2-pyridylmethyl)propane-1,3-diamine, resp.) were used to synthesize four mononuclear MnII complexes, [(L25)MnCl](PF6) (1(PF6)), [(L35)MnCl](PF6) (2(PF6)), [(L25)Mn(OH2)](BPh4)2 (3(BPh4)2), and [(L35)Mn(OH2)](BPh4)2 (4(BPh4)2). The x-ray diffraction studies revealed different configurations for the ligand L5n (n = 2, 3) depending on the 6th exogenous ligand and/or the counterion. Solid state high-field ESR spectra were recorded on complexes 1-4 as on previously described mononuclear MnII systems with tetra- or hexadentate amino-pyridine ligands. Pos. and neg. axial zero-field splitting (ZFS) parameters D were detd. whose abs. values ranged from 0.090 to 0.180 cm-1. D.-functional theory calcns. were performed unraveling that, in contrast with chloro systems, the spin-spin and spin-orbit coupling contributions to the D-parameter are comparable for mixed N,O-coordination sphere complexes. [on SciFinder(R)]
Références
- Titre
- Syntheses, X-ray Structures, Solid State High-Field Electron Paramagnetic Resonance, and Density-Functional Theory Investigations on Chloro and Aqua MnII Mononuclear Complexes with Amino-Pyridine Pentadentate Ligands.
- Type de publication
- Article de revue
- Année de publication
- 2008
- Auteurs
- Hureau, Christelle, Groni Sihem, Guillot Régis, Blondin Geneviève, Duboc Carole, and Anxolabehere-Mallart Elodie.
- Revue
- Inorg. Chem.
- Volume
- 47
- Pagination
- 9238–9247
- ISSN
- 0020-1669
Soumis le 12 avril 2018