Exchange Coupling and Magnetic Blocking in Bipyrimidyl Radical-Bridged Dilanthanide Complexes

被引：331

作者：

Demir, Selvan ^{[1
]}

Zadrozny, Joseph M. ^{[1
]}

Nippe, Michael ^{[1
]}

Long, Jeffrey R. ^{[1
]}

机构：

[1] Univ Calif Berkeley, Dept Chem, Berkeley, CA 94720 USA

来源：

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY | 2012年 / 134卷 / 45期

基金：

美国国家科学基金会;

关键词：

SINGLE-MOLECULE-MAGNET; SPIN-LATTICE-RELAXATION; RARE-EARTH SALTS; LANTHANIDE COMPLEXES; BEHAVIOR; MONONUCLEAR; DYSPROSIUM(III); TETRANUCLEAR; DILUTION; LIGANDS;

D O I：

10.1021/ja308945d

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

The synthesis and magnetic properties of three new bipyrimidyl radical bridged dilanthanide complexes, [(Cp*(2)Ln)(2)(mu-bpym(center dot))](+) (Ln = Gd, Tb, Dy), are reported. Strong Ln(III)-bpym(center dot-) exchange coupling is observed for all species, as indicated by the increases in chi T-M at low temperatures. For the (GdI)-I-II-containing complex, a fit to the data reveals antiferromagnetic coupling with J = -10 cm(-1) to give an S = 13/2 ground state. The Tb-III and Dy-III congeners show single-Molecule magnet behavior with relaxation barriers of U-eff = 44(2) and 87.8(3) cm(-1), respectively, a consequence of the large magnetic anisotropies-imparted by these ions. Significantly, the latter Complex exhibits a divergence of the field cooled and zero-field-cooled dc susceptibility data at 6.5 K and magnetic hysteresis below this temperature.

引用

页码：18546 / 18549

页数：4

共 47 条

[1] Mononuclear Lanthanide Single Molecule Magnets Based on the Polyoxometalates [Ln(W5O18)2]9- and [Ln(β2-SiW11O39)2]13- (LnIII = Tb, Dy, Ho, Er, Tm, and Yb)
AlDamen, Murad A.
Cardona-Serra, Salvador
Clemente-Juan, Juan M.
Coronado, Eugenio
Gaita-Arino, Alejandro
Marti-Gastaldo, Carlos
Luis, Fernando
Montero, Oscar
[J]. INORGANIC CHEMISTRY, 2009, 48 (08) : 3467 - 3479
[2] Ardavan A., 2007, PHYS REV LETT, V98
[3] Magnetism of lanthanides in molecular materials with transition-metal ions and organic radicals
Benelli, C
Gatteschi, D
[J]. CHEMICAL REVIEWS, 2002, 102 (06) : 2369 - 2387
[4] Preparation of coordination compounds of Cp*2Yb with heterocyclic nitrogen bases:: Examples of antiferromagnetic exchange coupling across bridging ligands
Berg, DJ
Boncella, JM
Andersen, RA
[J]. ORGANOMETALLICS, 2002, 21 (22) : 4622 - 4631
[5] Single Pyramid Magnets: Dy5 Pyramids with Slow Magnetic Relaxation to 40 K
Blagg, Robin J.
Muryn, Christopher A.
McInnes, Eric J. L.
Tuna, Floriana
Winpenny, Richard E. P.
[J]. ANGEWANDTE CHEMIE-INTERNATIONAL EDITION, 2011, 50 (29) : 6530 - 6533
[6] Molecular spintronics using single-molecule magnets
Bogani, Lapo
Wernsdorfer, Wolfgang
[J]. NATURE MATERIALS, 2008, 7 (03) : 179 - 186
[7] Giant field dependence of the low temperature relaxation of the magnetization in a dysprosium(III)-DOTA complex
Car, Pierre-Emmanuel
Perfetti, Mauro
Mannini, Matteo
Favre, Annaick
Caneschi, Andrea
Sessoli, Roberta
[J]. CHEMICAL COMMUNICATIONS, 2011, 47 (13) : 3751 - 3753
[8] Tetranuclear [Cu-Ln]2 single molecule magnets:: synthesis, structural and magnetic studies
Costes, Jean-Pierre
Shova, Sergiu
Wernsdorfer, Wolfgang
[J]. DALTON TRANSACTIONS, 2008, 14 (14) : 1843 - 1849
[9] deMunno G, 1996, NATO ADV SCI I C-MAT, V484, P555
[10] C-H bond activation through steric crowding of normally inert ligands in the sterically crowded gadolinium and yttrium (C5Me5)3M complexes
Evans, William J.
Davis, Benjamin L.
Champagne, Timothy M.
Ziller, Joseph W.
[J]. PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA, 2006, 103 (34) : 12678 - 12683

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