Three new one-dimensional lanthanide complexes bridged by nitronyl nitroxide radicals: Crystal structures and magnetic characterization

详细信息    查看全文

• 作者：Ruina Liu ; ^{liuruina@mail.nankai.edu.cn} ; Sanping Zhao ; Chuanxi Xiong ; Jie Xu ; Qiong Li ; Dong Fang
• 关键词：Lanthanide ; Nitronyl nitroxide ; Crystal structures ; Magnetic properties
• 刊名：Journal of Molecular Structure
• 出版年：2013
• 出版时间：27 March, 2013
• 年：2013
• 卷：1036
• 期：Complete
• 页码：107-110
• 全文大小：519 K

文摘

Reaction of the nitronyl nitroxide radicals NIT-2thien or NIT-3Brthien with Ln(hfac)₃¡¤2H₂O affords three new one-dimensional lanthanide-nitronyl nitroxide complexes [Ho(hfac)₃(NIT-2thien)]_n (1); [Ho(hfac)₃(NIT-3Brthien)]_n (2); [Eu(hfac)₃(NIT-3Brthien)]_n (3) (hfac = hexafluoroacetylacetonate; NIT-2thien = 2-(2¡ä-thienyl)-4,4,5,5-tetramethyl-imidazoline-1-oxyl-3-oxide; NIT-3Brthien = 2-(3¡ä-bromo-2¡ä-thienyl)-4,4,5,5-tetramethyl-imidazoline-1-oxyl-3-oxide). They have been characterized by X-ray single crystal structure analysis, element analysis, infrared spectra, and direct current, alternating current magnetic susceptibility measurements. All compounds are composed of linear chains built up by Ln(hfac)₃ units bridged by nitronyl nitroxide radicals through their NO groups. Magnetic studies reveal that the Eu-coordinated nitroxide and the radicals through the Eu atom interactions are antiferromagnetic.