| 铜(Ⅱ)5-氟尿嘧啶的多核配合物的合成及磁学性质表征 |
| SYNTHESIS AND MAGNETIC CHARACTERIZATION OF POLYNUCLEAR COMPLEXES OF COPPER(II) WITH 5-FLUOROURACIL |
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| 摘要: 本文合成了两种新的铜(Ⅱ)5-氟尿密嘧啶配合物,[Cu(fuH)(Ac)(OH)](1)和[Cu3O(fuH)2(Ac)(OH)3](2),进行了元素分析和红外光谱测定。从80-300K变温磁化率的数据表明,1和2均服从Curie-Weiss定律,θ值分别为-92K和-94K,证示在1和2分子内部均存在着反铁磁偶合作用。出1的室温多晶EPR谱测得g11>=2.30,g⊥=2.08和|A11|=16.8mT,表明铜(Ⅱ)的几何构型为畸变四方形,其单电子主要集居于dx2-y2轨道。同时对1和2的可能结构及反铁磁偶合作用机制进行了讨论。 |
| 关键词: 铜(Ⅱ)多核配合物 5-氟尿嘧啶 反铁磁相互作用 |
| 基金项目: 国家自然科学基金 |
| Abstract: Two novel polynuclear copper(Ⅱ) complexes of 5-fluorouracil (fuH) were synthesized in ethanolic solution of equimolar fuH and CuAc2·H2O in the presence of and without the adding of sodium acetate respectively . Their analytical data are consistent with the following for-mulas:[Cu(fuH) (Ac)(OH)] (1) and [Cu3O (fuH)2(Ac)(OH)3] (2).IR data suggest that two keto oxygens of fuH coordinate with Cu(Ⅱ) in 1 and 2, but the bonding mode of acetate anion seems to be different.The variable-temperature magnetic susceptibility measurements show that both complexes exhibit significant antiferromagnetic interaction between the Cu(Ⅱ) centers over the temperature region of 80-300K, the Weiss constant θ for 1 and 2 is equal to-92K and-94K. The RT EPR parameters for 1 are g11 = 2.30, g⊥= 2.08 and |A11| = 16.8mT, from which it is inferred that the unpaired electron of Cu(Ⅱ) is in essentially a dx2-y2 orbital. A dimeric structure for 1 and a trinuclear oxo-centered complex with bridged fuH and Ac-ligands for 2 were postulated. |
| Keywords: polynuclear copper (II) complex 5-fluorouracil antiferromagnetic interaction |
| 投稿时间：1988-01-20 |
| 摘要点击次数: 1314 |
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| 林纪筠,杨维达.铜(Ⅱ)5-氟尿嘧啶的多核配合物的合成及磁学性质表征[J].无机化学学报,1990,6(2):154-158. |
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