A comparative study of magnetization dynamics in dinuclear dysprosium complexes featuring bridging chloride or trifluoromethanesulfonate ligands.

Author(s) Burns, C.P.; Wilkins, B.O.; Dickie, C.M.; Latendresse, T.P.; Vernier, L.; Vignesh, K.R.; Bhuvanesh, N.S.; Nippe, M.
Journal Chem Commun (Camb)
Date Published 2017 Jul 25

We utilized a rigid ligand platform PyCp2(2-) (PyCp2(2-) = [2,6-(CH2C5H3)2C5H3N](2-)) to isolate dinuclear Dy(3+) complexes [(PyCp2)Dy-(μ-O2SOCF3)]2 (1) and [(PyCp2)Dy-(μ-Cl)]2 (3) as well as the mononuclear complex (PyCp2)Dy(OSO2CF3)(thf) (2). Compounds 1 and 2 are the first examples of organometallic Dy(3+) complexes featuring triflate binding. The isolation of compounds 1 and 3 allows us to comparatively evaluate the effects of the bridging anions on the magnetization dynamics of the dinuclear systems. Our investigations show that although the exchange coupling interactions differ for 1 and 3, the dynamic magnetic properties are dominated by relaxation via the first excited state Kramers doublet of the individual Dy sites. Compounds 1 and 3 exhibit barriers to magnetization reversal (Ueff = 49 cm(-1)) that can be favorably compared to those of the previously reported examples of [Cp2Dy(μ-Cl)]2 (Ueff = 26 cm(-1)) and [Cp2Dy(thf)(μ-Cl)]2 (Ueff = 34 cm(-1)).

DOI 10.1039/c7cc02457f
ISSN 1364-548X
Citation Chem Commun (Camb). 2017;53(60):84198422.

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