Synthesis and properties of the complexes of lanthanides with nitronyl nitroxide biradical |
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Authors: | ZHAO Qi-Hua LI Li-Cun LIAO Dai-ZhengJIANG Zong-Hui YAN Shi-Ping FANG Rui-Bin |
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Affiliation: | ZHAO,Qi-Hua LI,Li-Cun LIAO,Dai-ZhengJIANG,Zong-Hui YAN,Shi-Ping FANG,Rui-Bin Department of Chemistry,Nankai University,Tianjin 300071,China State Key Laboratory of Coordination Chemistry,Nanjing Unive rsity,Nanjing,Jiangsu 210093,China Department of Chemistry,Yunnan University,Kunming,Yunnan 650091,China |
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Abstract: | Five novel complexes of formula [Ln(hfac)3] · BNPhOM, where La = Gd, Ho, Dy, Y, Er; Mac = hexfluoracetylacetonate; BNPhOM=1,3‐[bis‐2,2′,‐(4,4,5,5‐tetramethyl‐4,5‐di‐hydro‐1H‐imidazolyl‐1‐oxyl‐3‐oxide) phenoxy] propane, have been prepared and characterized by elemental analysis, molar conductances, IR and electronic spectra. The temperature dependence of the magnetic susceptibility for Gd(III) and radical was measured (2—‐300 K). The observed data were successfully simulated giving the exchange integral J = 0.28 cm?1, J' = ‐ 0.33 cm?1. These results indicate a weak ferromagnetic spin exchange interaction between Gd(III) ion and the radical and a weak antiferromagnetic spin exchange interaction between the radical and radical. |
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Keywords: | Rare earth complexes nitronyl nitroxide biradical magnetism |
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