EPR characterization of half-integer-spin iron molecule-based magnets

被引：9
|
作者：
Datta, Saiti
Betancur-RodrigueZ, Arnalia
Lee, Sheng-Chiang
Hill, Stephen [1 ]
Foguet-Albiol, Dolos
Bagai, Rashmi
Christou, George
机构：
[1] Univ Florida, Dept Phys, Gainesville, FL 32611 USA
[2] Univ Florida, Dept Chem, Gainesville, FL 32611 USA
来源：
POLYHEDRON | 2007年 / 26卷 / 9-11期
基金：
美国国家科学基金会;
关键词：
single-molecule magnets; nanomagnet; electron paramagnetic resonance; quantum tunneling; iron;
D O I：
10.1016/j.poly.2006.11.006
中图分类号：
O61 [无机化学];
学科分类号：
070301 ; 081704 ;
摘要：
We report single crystal high-frequency electron paramagnetic resonance studies of two recently discovered half-integer Fe-7 complexes: [Fe7O3(O2CBu')(9)(mda)(3)(H2O)(3)] (1) and [Fe7O4(O2CPh)(11)(dmem)(2)] (2). The obtained spectra confirm spin S = 5/2 ground states for both complexes. On the basis of detailed frequency and field orientation dependent studies, we find that complex 1 is a single-molecule magnet (uniaxial zero-field-splitting parameter, D < 0) while complex 2 is not (D > 0). The EPR linewidth for complex 1 is considerably narrower in comparison to spectra obtained for other single-molecule magnets, suggesting the possibility of reduced decoherence from nuclear spins (Fe-56 has no nuclear moment). (c) 2006 Elsevier Ltd. All rights reserved.
引用
收藏
页码：2243 / 2246
页数：4
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