铒钇异核谷氨酸配合物的合成及晶体结构  

Synthesis and Crystal Structure of a Heteronuclear Complex of Erbium Yttrium with Glutamic acid: [ErY(Glu) 2(H 2O) 8](ClO 4) 4·2 75 H 2O

作　　者：李俊然[1] 周丽萍 金天柱[1] 郁开北[2] 

机构地区：[1]北京大学化学与分子工程学院稀土材料化学及应用国家重点实验室 [2]中国科学院成都分院分析测试中心

出　　处：《北京大学学报（自然科学版）》1997年第4期420-426,共7页Acta Scientiarum Naturalium Universitatis Pekinensis

基　　金：稀土材料化学及应用国家重点实验室及国家攀登计划基金

摘　　要：在水溶液中合成了铒钇异核谷氨酸配合物［ＥｒＹ（Ｇｌｕ）２（Ｈ２Ｏ）８］·（ＣｌＯ４）４·２．７５Ｈ２Ｏ的单晶，并用Ｘ射线单晶衍射仪测定了其晶体结构。晶体属单斜晶系，Ｐ２１空间群。晶胞参数：α＝１．１０３９０（１０）ｎｍ，ｂ＝１．６４９３（２）ｎｍ，ｃ＝１．９９８６（３）ｎｍ，β＝１０３．６００（１０）０，Ｖ＝３．５３６７（８）ｎｍ３，Ｚ＝４，Ｄｃ＝２．１４１ｇ／ｃｍ３。最终偏差因子Ｒ＝０．０３１１。配合物为由双核联结成的网状分子。在每个双核结构单元中，２个金属离子被４个谷氨酸的４个羧基桥联，２个谷氨酸的远离氨基的羧基以三齿（螯合配位加上１个氧桥）与中心离子配位；每个中心离子还有４个水分子配位，因此，铒和钇离子的配位数为９。The title complex was synthesized in an aqueous solution and its crystal structure was determined by X ray diffraction. The crystal is monoclinic with space group P 2 1. The cell parameters are: a =1.10390(10) nm, b =1.6493(2) nm, c =1.9986(3) nm, β =103.600(10) 0, V = 3.5367(8) nm 3, Z =4, D c=2.141 g/cm 3. The final R is 0.0311. The complex molecule is an infinite layer built from binuclear polymer. In each binuclear unit, two metal ions are connected by four bridging carboxyl groups from four glutamic acid molecules, two carboxyl groups of near the NH 2 are simple bridging coordination and the carboxyl groups far from NH 2 tridentate to the central ions. Each metal ion is also coordinated by four water molecules. So the coordination number of the central ion is nine, and forming a trigontetradecahedron arrangement.

关 键 词：铒钇异核 配合物 谷氨酸 晶体结构 合成 

分 类 号：O629.7[理学—有机化学] O641.4[理学—化学]