Synthesis of (Ge9-Ge9)6- Dimeric Zintl Ions in Liquid Ammonia Solutions of K4Ge9: Low-Dimensional Coordination Networks in the Crystal Structure of the Ammoniates Kn[K([2.2.2]crypt)]6-n[Ge9-Ge9](NH3)m (n = 2, 3, and 4)

2011 ◽  
Vol 637 (7-8) ◽  
pp. 901-906 ◽  
Author(s):  
Sandra Scharfe ◽  
Thomas F. Fässler
Keyword(s):  
Crystal Structure ◽  
Liquid Ammonia ◽  
Coordination Networks ◽  
Zintl Ions ◽  
Low Dimensional

Na2La4(NH2)14·NH3, a lanthanum-rich intermediate in the ammonothermal synthesis of LaN and the effect of ammonia loss on the crystal structure

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Sebastian Kunkel ◽  
Rainer Niewa
Keyword(s):  
Crystal Structure ◽  
Liquid Ammonia ◽  
Spectroscopic Studies ◽  
Ammonia Loss ◽  
Raman Spectroscopic ◽  
Sodium Cations ◽  
Retrograde Solubility ◽  
Third Dimension ◽  
Supercritical Ammonia ◽  
Similar Unit

Abstract Single crystals of Na2La4(NH2)14·NH3 were obtained from supercritical ammonia under ammonobasic conditions at a temperature of 573 K and 120 MPa pressure. It represents a lanthanum-rich intermediate in the ammonothermal synthesis of LaN. Upon aging, the title compound loses the crystal ammonia, resulting in pale crystals of Na2La4(NH2)14, the original space group P212121 being retained in a very similar unit cell. However, the crystal structure reacts to subtle changes in the composition as well as to the modified coordination of particularly the sodium cations interconnecting lanthanum amide layers within a third dimension. Results of Raman spectroscopic studies are reported. The observations of thermal analysis measurements indicating the formation of lanthanum nitride, in combination with the observed retrograde solubility in liquid ammonia, contribute to the knowledge of the ammonothermal crystal growth of lanthanum nitride.

Darstellung und Charakterisierung von Rubidiumhydrogencyanamid/Synthesis and Characterization of Rubidium Hydrogen Cyanamide

1999 ◽  
Vol 54 (11) ◽  
pp. 1375-1378 ◽  
Author(s):  
Michael Becker ◽  
Martin Jansen
Keyword(s):  
Crystal Structure ◽  
Liquid Ammonia ◽  
Synthesis And Characterization ◽  
Hydrogen Cyanamide ◽  
X Ray ◽  
Bond Lengths

The synthesis of RbHCN2 was carried out by reaction of cyanamide with rubidium amide in liquid ammonia. The crystal structure has been determinedo by x-ray powder methods (orthorhombic, P21,21,21, a = 7.299(1), b = 9.435(1), c = 9.420(1) Å; Z = 8). The anion is slightly bent (174°) and exhibits two different bond lengths (C-N: 1.17, HN-C: 1.31 Å).

Darstellung und Kristallstruktur von Lithiumozonid-Ammoniakat (1/5) LiO3 · 5 NH3/Synthesis and Crystal Structure of Lithiumozonide-Ammonia (1/5) LiO3 · 5 NH3

1999 ◽  
Vol 54 (11) ◽  
pp. 1345-1349 ◽  
Author(s):  
Wilhelm Klein ◽  
Martin Jansen
Keyword(s):  
Crystal Structure ◽  
Oxygen Atom ◽  
Cation Exchange ◽  
Liquid Ammonia ◽  
Boiling Temperature ◽  
Synthesis And Crystal Structure ◽  
Central Oxygen

Lithium ozonide has been synthezised starting from cesium ozonide via cation exchange in liquid ammonia and crystallizes at -78°C as an ammoniate, LiO3 · 5NH3. The coarse, ruby red crystals decompose above the boiling temperature of ammonia and are extremely sensitive to moisture. The crystal structure of L iO3 · 5NH3 (P c21n; a = 1231.9(5), b = 637.4(2), c = 1104.8(4) pm; Z = 4; R1 = 4.57%; 1318 independent reflections) consists of lithium tetramine complexes, ozonide anions and non coordinating ammonia molecules. With respect to the arrangement of the complex cations and of the anions there is similarity to the WC type of structure. The central oxygen atom of the ozonide anion is disordered.

La- and Lu-agardite – preparation, crystal structure, vibrational and magnetic properties

2020 ◽  
Vol 75 (1-2) ◽  
pp. 191-199
Author(s):  
Aleksandr M. Golubev ◽  
Eva Brücher ◽  
Armin Schulz ◽  
Reinhard K. Kremer ◽  
Robert Glaum
Keyword(s):  
Crystal Structure ◽  
Magnetic Properties ◽  
Dft Calculations ◽  
Powder Diffraction ◽  
Hexagonal Structure ◽  
Water Molecules ◽  
X Ray ◽  
Bond Lengths ◽  
Inner Diameter ◽  
Low Dimensional

AbstractPolycrystalline samples of La- and Lu-agardite with the composition RECu6(OH)6(AsO4)3 · n H2O (RE = La, Lu; n≈3) have been prepared and the structure of the products was determined by X-ray powder diffraction studies. The characterization has been complemented by Raman and UV/Vis spectroscopic, magnetic and TGA investigations. DFT calculations support the conclusions drawn from the experiments. The arsenates RECu6(OH)6(AsO4)3 · n H2O (RE = La, Lu; n≈3) are isostructural with the mineral mixite and crystallize with a hexagonal structure which contains ribbons of edge-sharing [CuO5] square-pyramids extending along the hexagonal axis. They are interconnected via (AsO4)3− groups to form hexagonal tubes of about 10 Å inner diameter. Such zeolite-like tubes host water molecules, which can be reversibly removed at moderate temperatures (T≈100°C). Like in mixite and YCu6(OH)6(AsO4)3 · 3 H2O, the Cu2+ cations in RECu6(OH)6(AsO4)3 · n H2O (RE = La, Lu; n≈3) exhibit low-dimensional antiferromagnetic properties, which are subject to changes in the Cu–O–Cu bond lengths and angles due to the lanthanide contraction.

Detection of the Elusive Highly Charged Zintl Ions Si44−and Sn44−in Liquid Ammonia by NMR Spectroscopy

2013 ◽  
Vol 52 (16) ◽  
pp. 4483-4486 ◽  
Author(s):  
Maria Neumeier ◽  
Franziska Fendt ◽  
Stefanie Gärtner ◽  
Carina Koch ◽  
Tobias Gärtner ◽  
...  
Keyword(s):  
Nmr Spectroscopy ◽  
Liquid Ammonia ◽  
Zintl Ions
Sign in / Sign up

Export Citation Format

Share Document