lanthanum germanide | 12025-66-0

• 分子结构分类: 无机化合物 - 混合金属/非金属化合物 - 各种混合金属/非金属
• 英文名称: lanthanum germanide
• 英文别名: Germane--lanthanum (3/5)；germane;lanthanum
• CAS: 12025-66-0
• 化学式: Ge₃La₅
• 分子量: 912.297
• InChiKey: RNZJZARVERXPNA-UHFFFAOYSA-N

计算性质

• 辛醇/水分配系数(LogP)：
  -4.35
• 重原子数：
  8
• 可旋转键数：
  0
• 环数：
  0.0
• sp3杂化的碳原子比例：
  0.0
• 拓扑面积：
  0
• 氢给体数：
  0
• 氢受体数：
  0

反应信息

• 作为反应物：
  描述：

  lanthanum germanide 、 钌 以 neat (no solvent) 为溶剂， 生成
  参考文献：
  名称：

  La₁₅Ge₉Z. Interstitial Derivatives with an Ordered Superstructure of the Mn₅Si₃ Structure Type. Property Trends in a Series of Homologous Intermetallic Phases

  摘要：

  The phases La(15)Ge(9)Z, Z = Mn, Fe, Co, Ni, Cu, Ru, C, O, P, have been obtained from reactions of either the elements or suitable binary compounds in sealed Ta containers at 1200-1350 degrees C. All exhibit an ordered root 3a x root 3a x c superstructure of the Mn5Si3 type (La(5)Ge(3)Z, La(5)Ge(3)Z, P6(3)/mcm) in which two-thirds of the slightly distorted confacial chains of trigonal antiprisms (La6/2Ge6/2) have Z bound in alternate, contracted interstitial sites. The room-temperature structures for Z = Mn, Fe, Co, Ni, C, P were refined from single-crystal data (space group P6(3)mc, Z = 2; for the protypical Fe, a = 15.4810(2) Angstrom and c = 6.8768(3) Angstrom). The unit cell lengths and volumes and d(Z-Z) values show notably smaller variations with Z than in La(5)Ge(3)Z or related systems. The buffering effect of empty cavities in the commensurate chains and the weak La-La bonding appear to be responsible. Magnetic susceptibility data and XPS core shifts are reported for the Fe and, in part, the Co and Ni phases La(15)Ge(9)Z. All three are metallic with decreasing moments of similar to 1.83, similar to 0.3, and similar to 0 mu(3), respectively. In contrast, the Fe-richer La5Ge3Fe is a very soft ferromagnet at room temperature. Members of the sequence Fe, La5Ge3Fe, La15Ge9Fe exhibit regularly decreasing moments as well. The Fe 2p(3/2) core levels show a 1.7 eV decrease over the same series, i.e., increasing reduction, while an evidently regular oxidation of La from the element through La5Ge3 and La15Ge9Fe to La(5)e(3)Fe is indicated by a regular overall increase of 2.7 eV in La 3d(5/2) binding energies.

  DOI：

  10.1021/ic9515158
• 作为产物：
  描述：

  锗烷 、 三氢化镧 以 neat (no solvent) 为溶剂， 生成 lanthanum germanide
  参考文献：
  名称：

  Standard enthalpies of formation of Me5Ge3(Me ≡ Sc, Y, La) by high-temperature calorimetry

  摘要：

  The standard enthalpies of formation of the germanides Me5Ge3(Me = Sc, Y, La) were determined by high-temperature calorimetry at 1473 +/- 2 K. The following values are reported: DELTA-H(f)o(Sc5Ge3) = - 747.3 +/- 30.8 kJ mol-1 and DELTA-H(f)o(Y5Ge3) = - 718.2 +/- 39.9 kJ mol-1, measured by solute-solvent drop calorimetry, and DELTA-H(f)o(La5Ge3) = - 543.9 +/- 8.0 kJ mol-1, measured by the direct synthesis method. The results are compared with estimated values from Miedema's semi-empirical model.

  DOI：

  10.1016/0022-5088(91)90237-x

文献信息

• Dimorphism in La₅Ge₃and Ce₅Ge₃? How Exploratory Syntheses Led to Surprising New Finds in the La-Ge and Ce-Ge Binary Phase Diagrams
  作者：Nian-Tzu Suen、Svilen Bobev

  DOI：10.1002/zaac.201300546

  日期：2014.4

  the crystal structures, and the electronic structures of two new tetragonal phases, La5Ge3 and Ce5Ge3. Both title compounds crystallize in the Pu5Rh3 (P4/ncc) structure type, which has close structural relationship with the W5Si3 (I4/mcm) structure type. The synthetic results, supported by thermal analysis suggest that this tetragonal phase is only stable at relatively low temperature and it transforms

  报道了两种新四方相 La5Ge3 和 Ce5Ge3 的合成、晶体结构和电子结构。两种标题化合物均以 Pu5Rh3 (P4/ncc) 结构类型结晶，这与 W5Si3 (I4/mcm) 结构类型具有密切的结构关系。由热分析支持的合成结果表明，这种四方相仅在相对较低的温度下稳定，并在 850°C 以上转变为六方形式（Mn5Si3 结构类型，P63/mcm）。还讨论了 La5Ge3（Pu5Rh3 型）和 La5Sn3（W5Si3 型）之间的结构关系。温度相关的直流磁化强度和电阻率测量表明，四方相 La5Ge3 表现出类似泡利的顺磁性，是一种良好的金属导体。对于四方相 Ce5Ge3，磁行为在高温状态下服从居里-魏斯定律，而在低温下则偏离居里-魏斯定律。没有观察到低至 5 K 的长程磁序，尽管可以推断出低于约 5 K 的短程相关性。50 K。Ce5Ge3 的电阻率测量也显示出类似金属的温度依赖性，尽管类似于
• Combined effect of chemical pressure and valence electron concentration through the electron-deficient Li substitution on the RE4LiGe4 (RE=La, Ce, Pr, and Sm) system
  作者：Gnu Nam、Jieun Jeon、Youngjo Kim、Sung Kwon Kang、Kyunghan Ahn、Tae-Soo You

  DOI：10.1016/j.jssc.2013.06.027

  日期：2013.9

  Four members of the RE4LiGe4 (RE=La, Ce, Pr, and Sm) system have been prepared by high-temperature reaction method and characterized by X-ray diffractions. All compounds crystallize in the orthorhombic Gd5Si4-type structure (space group Pnma, Pearson code oP16) with bonding interactions for interslab Ge-2 dimers. The Li substitution for rare-earth elements in the RE4LiGe4 system leads to a combined effect of the increased chemical pressure and the decreased valance electron concentration (VEC), which eventually results in the structure transformation from the Sm5Ge4-type with all broken interslab Ge-Ge bond for the parental RE5Ge4 to the Gd5Si4-type structure for the ternary RE4LiGe4 (RE=La, Ce, Pr, and Sm) system. Site-preference between rare-earth metals and Li is proven to generate energetically the most favorable atomic arrangements according to coloring-problem, and the rationale is provided using both the size-factor and the electronic-factor related, respectively, to site-volume and electronegativity as well as QVAL values. Tight-binding, linear-muffin-tin-orbital (TB-LMTO) calculations are performed to investigate electronic densities of states (DOS) and crystal orbital Hamilton population (COHP) curves. The influence of reduced VEC for chemical bonding including the formation of interslab Ge-2 dimers is also discussed. The magnetic property measurements prove that the non-magnetic Li substitution leads to the ferromagnetic (FM)-like ground state for Ce4LiGe4 and the co-existence of antiferromagntic (AFM) and FM ground states for Sm4LiGe4. (c) 2013 Elsevier Inc. All rights reserved.
• Guloy, Arnold M.; Corbett, John D., Inorganic Chemistry, 1993, vol. 32, # 16, p. 3532 - 3540
  作者：Guloy, Arnold M.、Corbett, John D.

  DOI：——

  日期：——
• Standard enthalpies of formation of Me5Ge3(Me ≡ Sc, Y, La) by high-temperature calorimetry
  作者：Woo-Gwang Jung、O.J. Kleppa

  DOI：10.1016/0022-5088(91)90237-x

  日期：1991.4

  The standard enthalpies of formation of the germanides Me5Ge3(Me = Sc, Y, La) were determined by high-temperature calorimetry at 1473 +/- 2 K. The following values are reported: DELTA-H(f)o(Sc5Ge3) = - 747.3 +/- 30.8 kJ mol-1 and DELTA-H(f)o(Y5Ge3) = - 718.2 +/- 39.9 kJ mol-1, measured by solute-solvent drop calorimetry, and DELTA-H(f)o(La5Ge3) = - 543.9 +/- 8.0 kJ mol-1, measured by the direct synthesis method. The results are compared with estimated values from Miedema's semi-empirical model.
• Syntheses and structure of the La5Ge3Z phases (Z=Si, Sn, Pb, Ga, In): Structural relationships among the M5X4-type structures
  作者：Arnold Guloy、John D. Corbett

  DOI：10.1016/j.jssc.2005.01.021

  日期：2005.4

  The indicated reactions under arc-melting or high-temperature sintering conditions in Ta containers lead to (1) the apparent Zintl phase La5Ge3Si0.75, stuffed Mn5S6-type, P6(3)/mcm from quenching; (2) alpha-La5Ge3Si (Sm5Ge4-type, Pnma); (3) beta-La5Ge3Si (Zr5Si4-type, P4(1)2(1)2) at high temperatures; (4) La(5)Ge(3)Tt, Tt = Sn, Pb, phases isotypic with 2); (5) the isotypic La5Ge3Tr, Tr = Ga, In, (Gd5Si4-type, Pnma). The structures of compounds 3 and 5 (for Tr = Ga) have been refined from single crystal X-ray diffraction data. A general description of the three electron-poorer M5X4 Structure types 2,3,4 (and of Eu5As4-type (Cmca)) is given in terms of their common building block, an La(9)Tt(6) Cubeoctahedra centered about the tightest bound La. Some electronic bonding effects are also generalized with regard to the dominance of extra free electrons beyond simple Zintl expectations. (c) 2005 Published by Elsevier Inc.