A unique tetranuclear Mn(II) cluster bridged by carboxyl substituted nitronyl nitroxide radical: Crystal structure and magnetic properties
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- 作者：Yungai Li ; Yaowei Guo ; Haixia Tian ; Peng Hu ; Zan Sun ; Yue Ma ; Licun Li ; llicun@nankai.edu.cn" class="auth_mail ; Daizheng Liao
- 关键词：Nitronyl nitroxide radical ; Manganese ; Crown-like ring structure ; Magnetic properties
- 刊名：Inorganic Chemistry Communications
- 出版年：May, 2014
- 年：2014
- 卷：43
- 期：Complete
- 页码：135-137
- 全文大小：546 K
文摘
One unique radical-bridged Mn(II) cluster [Mn4(hfac)6(NIToBA)2(HIMoBAH)(H2O)3] (1) (hfac = hexafluoroacetylacetonate, NIToBAH = 2-(2-carboxyphenyl)-4,4,5,5-tetramethyl-4,5-dihydro-1H-imidazol-1-oxyl-3-oxide, HIMoBAH = 2-(2-carboxyphenyl)-4,4,5,5-tetramethyl-4,5-dihydro-1H-imidazol-1-hydroxy) has been synthesized and structurally and magnetically characterized. The core of complex 1 features four Mn(II) ions bridged by three carboxyl groups and two nitroxide groups to form a crown-like ring structure. This complex exhibits strong antiferromagnetic interaction because the NO groups are directly coordinated to the metal ions.