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

作　　者：林纪筠[1] 杨维达 

机构地区：[1]华东师范大学化学系,上海200062

出　　处：《无机化学学报》1990年第2期154-158,共5页Chinese Journal of Inorganic Chemistry

基　　金：国家自然科学基金

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[Cu_3O(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g‖=2.30,g⊥=2.08和|A‖|=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d_(x^2-y^2)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。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 d x -y orbital. A dimeric structure for 1 and a trinuclear oxo-centered complex with bridged fuH and Ac- ligands for 2 were postulated.

关 键 词：铜 多核配合物 氟尿嘧啶 磁性质 

分 类 号：O614.121[理学—无机化学]