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

Autor: Burns CP; Department of Chemistry, Texas A&M University, 3255 TAMU, College Station, TX 77843, USA. nippe@chem.tamu.edu., Wilkins BO; Department of Chemistry, Texas A&M University, 3255 TAMU, College Station, TX 77843, USA. nippe@chem.tamu.edu., Dickie CM; Department of Chemistry, Texas A&M University, 3255 TAMU, College Station, TX 77843, USA. nippe@chem.tamu.edu., Latendresse TP; Department of Chemistry, Texas A&M University, 3255 TAMU, College Station, TX 77843, USA. nippe@chem.tamu.edu., Vernier L; Department of Chemistry, Texas A&M University, 3255 TAMU, College Station, TX 77843, USA. nippe@chem.tamu.edu., Vignesh KR; Department of Chemistry, Texas A&M University, 3255 TAMU, College Station, TX 77843, USA. nippe@chem.tamu.edu., Bhuvanesh NS; Department of Chemistry, Texas A&M University, 3255 TAMU, College Station, TX 77843, USA. nippe@chem.tamu.edu., Nippe M; Department of Chemistry, Texas A&M University, 3255 TAMU, College Station, TX 77843, USA. nippe@chem.tamu.edu.
Jazyk: angličtina
Zdroj: Chemical communications (Cambridge, England) [Chem Commun (Camb)] 2017 Jul 25; Vol. 53 (60), pp. 8419-8422.
DOI: 10.1039/c7cc02457f
Abstrakt: We utilized a rigid ligand platform PyCp 2 2- (PyCp 2 2- = [2,6-(CH 2 C 5 H 3 ) 2 C 5 H 3 N] 2- ) to isolate dinuclear Dy 3+ complexes [(PyCp 2 )Dy-(μ-O 2 SOCF 3 )] 2 (1) and [(PyCp 2 )Dy-(μ-Cl)] 2 (3) as well as the mononuclear complex (PyCp 2 )Dy(OSO 2 CF 3 )(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 (U eff = 49 cm -1 ) that can be favorably compared to those of the previously reported examples of [Cp 2 Dy(μ-Cl)] 2 (U eff = 26 cm -1 ) and [Cp 2 Dy(thf)(μ-Cl)] 2 (U eff = 34 cm -1 ).
Databáze: MEDLINE
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