新型二维草酸根桥联配合物{[Cu(en)_2]_4[KFe(C_2O_4)_3]_4}_n的合成、结构和磁性  

A Novel Two - Dimensional Oxalate - Bridged Complex {[ Cu (en)_ 2 ]_ 4 [ KFe~Ⅲ (C_2O_4) _3 ]_ 4}_n Synthesis, Structure and Magnetic Properties

作　　者：杨光明[1] 寇会忠[1] 廖代正[1] 姜宗慧[1] 阎世平[1] 王耕霖[1] 姚心侃[2] 王宏根[2] 

机构地区：[1]南开大学化学系吸附分离功能高分子材料国家重点实验室,天津300071 [2]南开大学中心实验室,天津300071

出　　处：《化学学报》1999年第9期998-1003,共6页Acta Chimica Sinica

基　　金：国家自然科学基金(59772020;29631040);天津市自然科学基金资助项目

摘　　要：合成了一个新型草酸根桥联的二维配合物{[Cu(en)_2]_4[KFe(C_2O_4)_3]_4}_n,并进行了晶体结构测试和磁性研究.晶体结构分析显示:K^+离子为罕见的八配位环境,2个C_2O_4^(2-)和2个或1个K^+离子长程桥联2个Fe~Ⅲ离子,形成一个二维网状的[KFe(C_2O_4)_3]_n^(2n-)骨架,[Cu(en)_2]^(2+)单元通过(en)N—H…O(C_2O_4)氢键与[KFe(C_2O_4)_3]_n^(2n-)骨架连接.变温磁化率测量表明:Fe~Ⅲ与Fe~Ⅲ间存在着弱的磁相互作用,J=-0.17cm^(-1).A novel two - dimensional oxalate - bridged complex {[Cu(en)2]4[ KFe ( C2O4 )3 ]4 }n has been synthesized and structurally and magnetically characterized. In this complex the eight - coordinate environment of K + ions leads to a unique structural arrangement with two C2O42- bridges and two or one K+ ion linking pairs of FeIII ions. As a consequence, a novel 2D [ KFe( C2O4)3 ]n2n- network forms. Another feature of the structure is the presence of hydrogen bonding connecting the Cu(en)22+ entities and [KFe(C2O4)3]n2n- network through (en)N-H…O(C2O4) . The magnetic susceptibility data good fits to the experimental data from room temperature to 4.2K were obtained for J = - 0.17cm-1.

关 键 词：铜 草酸根 桥联 二维结构 配合物 磁性 氢键 

分 类 号：O614.121[理学—无机化学] O641.4[理学—化学]