...
首页> 外文期刊>Zeitschrift fur Anorganische und Allgemeine Chemie >M4N2Te3 (M = La-Nd): The first nitride tellurides with trivalent lanthanides
【24h】

M4N2Te3 (M = La-Nd): The first nitride tellurides with trivalent lanthanides

机译:M4N2Te3(M = La-Nd):第一种氮化碲化物与三价镧系元素

获取原文
获取原文并翻译 | 示例
           

摘要

The oxidation of the light lanthanides (M = La - Nd) with tellurium and sodium azide (NaN3) in the presence of the corresponding trichlorides (MCl3) yields the first nitride tellurides of the lanthanides with the composition M4N2Te3 when appropriate molar ratios of the reactants are used. Additional sodium chloride (NaCI) as a flux secures complete and fast reactions (7 d) at 900 ° C in evacuated silica tubes as well as the formation of black single crystals. The orthorhombic crystal structure (Pnma, Z = 4) was determined from single crystal X-ray diffraction data for La4N2Te3 (a = 746.58(6), b = 1184.16(9), c = 1160.7](9)pm), Ce4N2Te3 (a = 739.26(6), b = 1169.73(9), c = 1148.04(9) pm), Pr4N2Te3 (a = 734.75(6), b = 1163.82(9), c = 1139.53(9) pm), and Nd4N2Te3 (a 730.61(6), b = 1159.57(9), c = 1131.46(9) pm). Three crystallographically different M3+ cations are present, two of them (M1 and M2) reside in sixfold coordination of two N3- and four Te2- anions forming trigonal prisms. The third cation (M3) is coordinated by two N3- and five Te2- in the shape of a monocapped trigonal prism. However, the main feature of the crystal structure comprises N3--centred (M3+)(4) tetrahedra which are connected via trans-edges to build up one-dimensional infinite chains (1)(∞){[NM4/2e](3+)} (e - edge-sharing). These chains, caused by a significant tilting of the single tetrahedra relative to each other, are not stretched to ideal linearity, so a doubled repetition period compared to the single one (- two edge lengths of a tetrahedron) is necessary. They get bundled along [010] like a hexagonal rod packing and held together by two crystallographically different Te2- anions. Further motifs for the interconnection of [NM4](9+) tetrahedra in crystal structures of nitride chalcogenides and halides of the rare-earth elements (M = Sc, Y, La; Cc - Lu) with ratios of N : M = 1 : 2 are presented and discussed for comparison.
机译:在适当的反应物摩尔比下,在相应的三氯化物(MCl3)存在下,用碲和叠氮化钠(NaN3)氧化轻质镧系元素(M = La-Nd),得到镧系元素的第一氮化碲化物,其组成为M4N2Te3。被使用。额外的氯化钠(NaCl)为助熔剂,可确保在900&DEG的条件下进行完整,快速的反应(7 d);真空石英管中的C以及黑色单晶的形成。根据La4N2Te3(a = 746.58(6),b = 1184.16(9),c = 1160.7](9)pm),Ce4N2Te3(a = 746.58(6),b = 1184.16(9),单晶X射线衍射数据确定了正交晶体结构(Pnma,Z = 4)。 a = 739.26(6),b = 1169.73(9),c = 1148.04(9)pm),Pr4N2Te3(a = 734.75(6),b = 1163.82(9),c = 1139.53(9)pm)和Nd4N2Te3 (a 730.61(6),b = 1159.57(9),c = 1131.46(9)pm)。存在三个晶体学上不同的M3 +阳离子,其中两个(M1和M2)以两个六价配位形式存在于两个N3-和四个Te2-阴离子中,形成三角棱柱。第三阳离子(M3)由两个N3-和五个Te2-配成单峰三棱柱形状。然而,晶体结构的主要特征包括N3中心(M3 +)(4)四面体,它们通过跨边缘连接以建立一维无限链(1)(∞){[NM4 / 2e]( 3+)}(e-边缘共享)。由于单个四面体相对于彼此的明显倾斜而导致的这些链没有伸展到理想的线性,因此与单个单面(-四面体的两个边长)相比,重复周期必须加倍。它们像六角形的棒状填料一样沿着[010]捆扎在一起,并由两个晶体学上不同的Te2-阴离子固定在一起。 [NM4](9+)四面体在稀土元素(M = Sc,Y,La,Cc-Lu)的氮化物硫属元素化物和卤化物的晶体结构中以N:M = 1:1的比例相互连接的其他图案。提出并讨论了图2,以进行比较。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱:kefu@zhangqiaokeyan.com

京公网安备:11010802029741号 ICP备案号:京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有
  • 客服微信

  • 服务号