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Slow Magnetization Relaxation in a 1-D Double-Chain Coordination Polymer Composed of {DyIII 4} Repeating Units

[ Vol. 3 , Issue. 2 ]

Author(s):

Dimitris I. Alexandropoulos, Chaoran Li, Catherine P. Raptopoulou, Vassilis Psycharis, Wolfgang Wernsdorfer, George Christou and Theocharis C. Stamatatos   Pages 161 - 171 ( 11 )

Abstract:


The “unsuccessful” synthesis of the non-commercially available ‘Dy(O2CPh)3’ precursor from the stoichiometric reaction of Dy(NO3)3·5H2O with 3 equivalents of NaO2CPh in MeCN/H2O has led instead to the “successful” isolation and structural characterization of the 1-D coordination polymer [Dy4(O2CPh)12(H2O)8]n·2n(PhCO2H)·n(MeCN) (1·2n(PhCO2H)·n(MeCN)) in excellent yields (~90%). The one-dimensional double-chain structure of 1 was resulted from the linkage of two parallel chains by syn,anti- η1 1:µ PhCO2 - groups. The lattice structure of 1 is further extended to a 2-D network through hydrogen bonding and Π -Π stacking interactions. The observation of out-of-phase (χ" M) ac susceptibility signals suggested that 1 might be a molecular nanomagnet, and this was confirmed by single-crystal magnetization vs. dc field sweeps that exhibited hysteresis, the diagnostic property of a magnet.

Keywords:

Carboxylates, coordination polymers, crystal structures, dysprosium, slow magnetization relaxation.

Affiliation:

Department of Chemistry, Brock University, L2S 3A1 St. Catharines, Ontario, Canada.



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