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机构地区:[1]清华大学化学系,北京100084
出 处:《高等学校化学学报》2012年第5期892-896,共5页Chemical Journal of Chinese Universities
基 金:国家自然科学基金(批准号:50873053);国家自然科学基金委员会创新研究群体科学基金(批准号:20921001)资助
摘 要:合成了1个草酸-草酰胺混合桥联的双异金属配合物[Cu(L)(H2O)Mn(C2O4)].4H2O(H2L为1,4,8,11-四氮杂环十四烷-2,3-二酮).配合物由[Cu(Ⅱ)L(H2O)]、Mn(Ⅱ)、草酸根和晶格水分子构成.Mn(Ⅱ)通过草酸根的交替桥联作用形成弯折的中性一维链状骨架[Mn(C2O4)]n,而Mn(Ⅱ)剩余的2个配位点则由[CuL]上的2个草酰胺氧原子占据,形成了草酸-草酰胺混合桥联一维双金属配合物.而Cu(Ⅱ)为五配位,轴向上由1个水分子占据.磁性研究表明,配合物中Cu(Ⅱ)-Mn(Ⅱ)间通过草酰胺传递反铁磁相互作用,而Mn(Ⅱ)-Mn(Ⅱ)间亦通过草酸根离子存在反铁磁耦合.通过MAGPACK软件对变温磁化率进行拟合,得到JCu-Mn=-13.1 cm-1,JMn-Mn=-0.87 cm-1,g=2.01.A new complex,[Cu(L)(H 2O)Mn(C 2O 4)]/54H 2O(H 2L=1,4,8,11-tetraazacyclotetradecane-2,3-dione),was synthesized and structurally characterized by X-ray diffraction.The complex crystallizes in monoclinic space group P2 1/n with a=0.97471(5) nm,b=0.89316(5) nm,c=2.35635(11) nm,β=92.441(2)°,V=2.04951(18) nm3,D c=1.691 Mg/m3,Z=4,R_1=0.0607,wR_2=0.1915(based on F2).The complex consists of [CuL(H 2O)],Mn(Ⅱ),oxalate and lattice H 2O molecules.Through the alternate oxalate bridges,the Mn(Ⅱ) ions form a zig-zag one-dimensional chain,while the other two coordination sites of the Mn(Ⅱ) ion are occupied by two oxygen atoms from L2-of [CuL(H 2O)],giving rise to a mixed oxalate- and oxamido-bridged one-dimensional bimetallic complex.Magnetic studies show the presence of antiferromagnetic interaction between the Cu(Ⅱ) and Mn(Ⅱ) ions and between the adjacent Mn(Ⅱ) ions.Best fit to the experimental data by means of MAGPACK software gives the magnetic coupling constant of J Cu-Mn=-13.1 cm-1 and J Mn-Mn=-0.87 cm-1.
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