A high-frequency EPR characterization of the S=2 linear tri-atomic chain in Cr3(dpa)4Cl2•CH2Cl2

被引：13

作者：

Wang, Jingfang ^{[1
,2
]}

Wang, Zhenxing ^{[1
,2
]}

Clark, Ronald J. ^{[1
]}

Ozarowski, Andrew ^{[2
]}

van Tol, Johan ^{[1
,2
]}

Dalal, Naresh S. ^{[1
,2
]}

机构：

[1] Florida State Univ, Dept Chem & Biochem, Tallahassee, FL 32306 USA

[2] Natl High Magnet Field Lab, Tallahassee, FL 32310 USA

来源：

POLYHEDRON | 2011年 / 30卷 / 18期

关键词：

High frequency electron paramagnetic resonance; Zero field splitting; Extended metal atom chains; Spin orbital coupling; Single molecule magnet; METAL STRING COMPLEXES; HIGH-FIELD EPR; PARAMAGNETIC-RESONANCE; TRICHROMIUM COMPLEXES; BONDING INTERACTION; DIPYRIDYLAMIDE; MULTIFREQUENCY; EXCHANGE;

D O I：

10.1016/j.poly.2011.02.032

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

We report the high frequency electron paramagnetic resonance (HF-EPR) study of Cr-3(dpa)(4)Cl-2, a linear tri-atomic (Cr-II)(3) chain, that was reported to be EPR silent at the X-band (9.5 GHz). Higher frequencies yield well resolved spectra for this S = 2 system even at room temperature. At 30 K, our variable frequency (34-400 GHz) EPR spectra yield a large axial zero-field splitting (D) of -1.643(1) cm(-1) as well as a small rhombic ZFS parameter E = 0.0339(4) cm(-1); with g(x) = 1.9978(4), g(y) = 1.9972(4), and g(z) = 1.9808(4). The magnetic susceptibility measurements fully support the earlier magnetic susceptibility studies and the current EPR results. The observation of the EPR spectrum of only the S = 2 state at room temperature suggests that the ground state is well isolated from the excited states. (C) 2011 Elsevier Ltd. All rights reserved.

引用

页码：3058 / 3061

页数：4

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