A high field and frequency electron paramagnetic resonance study of the S=2 chromium(II) complex trans-[Cr(NCCH3)4(FBF3)2] and investigation of its reaction with dioxygen: Crystal structure of [(CH3CN)5CrOCr(NCCH3)5](BF4)4•2CH3CN

被引：16
作者：
Barra, Anne-Laure [2 ]
Dossing, Anders [1 ]
Morsing, Thorbjorn [1 ]
Vibenholt, Johan [1 ]
机构：
[1] Univ Copenhagen, Dept Chem, DK-2100 Copenhagen O, Denmark
[2] CNRS, Grenoble High Magnet Field Lab, F-38042 Grenoble 9, France
来源：
INORGANICA CHIMICA ACTA | 2011年 / 373卷 / 01期
关键词：
X-ray; Oxo-bridged; Dinuclear; EPR; Chromium; MAGNETIC-PROPERTIES; MOLECULAR-STRUCTURE; ACID RHODO; SALTS; TETRAFLUOROBORATE; ACETONITRILE; EPR; DIMERS; CATION; ROUTE;
D O I：
10.1016/j.ica.2011.02.024
中图分类号：
O61 [无机化学];
学科分类号：
070301 ; 081704 ;
摘要：
From high field and frequency electron paramagnetic resonance (EPR) powder spectra of the high spin chromium(II) complex trans-[Cr(NCCH3)(4)(FBF3)(2)] (1) recorded at T = 5-40 K the EPR parameters were found to be D = -2.19 cm (1), E approximate to 0 cm (1), and g(parallel to) = g(perpendicular to) = 1.9833. The reaction between a MeCN solution of 1 and dioxygen gave dark green crystals of [(CH3CN)(5)CrOCr(NCCH3)(5)](BF4)(4)center dot 2CH(3)CN (2). From the X-ray crystal structure of 2 at T = 122 K a Cr-O-Cr angle of 180 degrees and a Cr-O distance of 1.7556(5) angstrom was found. This is the shortest among the known Cr-O distances in dinuclear complexes containing a CrOCr4+ core, and this can partly explain the strong antiferromagnetic coupling between the two chromium(III) centers in 2. (C) 2011 Elsevier B. V. All rights reserved.
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页码：266 / 269
页数：4
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