Polybis(4-azabenzimidazolato)-iron(II) and -cobalt(II).: 3-D single diamond-like framework materials which exhibit spin canting and ferromagnetic ordering at low temperatures

被引:52
作者
Rettig, SJ [1 ]
Sánchez, V [1 ]
Storr, A [1 ]
Thompson, RC [1 ]
Trotter, J [1 ]
机构
[1] Univ British Columbia, Dept Chem, Vancouver, BC V6T 1Z1, Canada
来源
JOURNAL OF THE CHEMICAL SOCIETY-DALTON TRANSACTIONS | 2000年 / 21期
关键词
D O I
10.1039/b002574g
中图分类号
O61 [无机化学];
学科分类号
070301 ; 081704 ;
摘要
The direct reaction between ferrocene and an excess of molten 4-azabenzimidazole yielded amber-green crystals of polybis(4-azabenzimidazolato)iron(II), 1. Single crystal X-ray diffraction studies revealed tetrahedrally coordinated iron ions linked by single imidazolate bridges and forming a 3-D single diamond-like (diamondoid) extended lattice. Magnetization studies show the effects of antiferromagnetic exchange above a critical temperature, T-c=21 K, and long-range ferromagnetic ordering below this temperature, behavior that classifies 1 as a molecule-based magnet. Magnetic hysteresis studies at 4.8 K yield a coercive field, H-coer=80 G and a remnant magnetization, M-rem=2100 cm(3) G mol(-1). The isomorphous polybis(4-azabenzimidazolato)cobalt(II), 2, has also been studied. It too is a low temperature molecule-based magnet. For 2, T-c=11 K and from magnetic hysteresis studies at 10 K, H-coer=400 G and M-rem=22 cm(3) G mol(-1).
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页码:3931 / 3937
页数:7
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