22756-36-1Relevant articles and documents
RbBa2(N3)5: A new ternary azide
Vajenine, Grigori V.
, p. i85-i87 (2006)
Rubidium dibarium pentaazide, RbBa2(N3)5, was prepared from an aqueous solution of the binary azides at room temperature. It crystallizes in the monoclinic system (space group P2/n). Two central atoms of azide groups occupy the 2c (1) and 2b (1) positions, another azide group lies completely on a twofold axis (2f), while Rb atoms are situated in 2e (2) positions. The crystal structure of RbBa2(N 3)5 can be regarded as a distorted AlB7-type arrangement of the metal atoms, with the azide groups occupying the voids between the cations. This results in coordination numbers of 8 (Rb) and 10 (Ba). The N-N distances are in the range 1.169 (8)-1.190 (5) A, typical for the azide group.
Synthesis and Structural Characterization of the layered Selenogallate RbGaSe2
Friedrich, Daniel,Schlosser, Marc,Pfitzner, Arno
, p. 1589 - 1592 (2017)
The chalcogenogallate RbGaSe2 was synthesized by thermal decomposition of rubidium azide in the presence of gallium selenide and selenium. RbGaSe2 crystallizes in the monoclinic space group C2/c (no. 15) with the lattice parameters a = 10.954(1) ?, b = 10.949(1) ?, c = 16.064(1) ?, β = 99.841(4)°, V = 1898.2(2) ?3, and Z = 16 (single-crystal data, 20 °C) in the TlGaSe2 structure type. Its crystal structure features anionic layers 2∞[Ga4Se84–] with a van der Waals distance of 3.30(1) ?. Thermal analysis revealed a melting point of about 930 °C. Using UV/Vis diffuse reflectance spectroscopy, a wide bandgap of 3.16 eV was determined for the colorless semiconductor. The bonding situation in the compound was further compared with the isotypic cesium phases based on the results from Raman spectroscopy and DFT calculations. The slight shifts of the Raman bands suggest a slightly higher covalency of the rubidium compound.
Synthesis and crystal structure of Rb3AgO2
Sofin,Friese,Nuss,Peters,Jansen
, p. 2500 - 2504 (2002)
Rb3AgO2 was prepared via the azide/nitrate route. Stoichiometric mixtures of the precursors (Ag2O, RbN3 and RbNO3) were heated in a special regime up to 450°C and annealed at this temperature for 50 h in silver crucibles. Single crystals have been grown by subsequent annealing of the as prepared powder at 450°C for 500 h in silver crucibles, which were sealed in glass ampoules under dried Ar. According to the X-ray analysis of the crystal structure (P212121, Z = 16, a = 12.800(1), b = 12.848(1), c = 14.329(1) A, 6566 independent reflections, R(all) = 0.0795, Rw(all) = 0.0218), Rb3AgO2 is isostructural with K3AgO2. The structure can be derived from the fluorite structure type. Silver is linearly coordinated by oxygen atoms, while Rb has pseudo-tetrahedral coordination. The crystal under investigation was composed of four twin individuals.
Synthesis, crystal structures, and vibrational spectra of novel azidopalladates of the alkali metals Cs2[Pd(N3) 4] and Rb2[Pd(N3)4]·2/3H 2O
Afyon, Semih,Hoehn, Peter,Somer, Mehmet
, p. 1301 - 1306 (2011/01/05)
The transparent dark orange compounds Cs2[Pd(N3) 4] and Rb2[Pd(N3)4]·2/3H 2O are synthesized by reaction, of the respective binary alkali metal azides with K2PdCl4 in aqueous solutions. According to single-crystal X-ray diffraction investigations, the novel ternary azidopalladates(II) crystallize in the monoclinic space group P21/c (no. 14) with a = 705.7(2) pm, b = 717.3(2) pm, c = 1125.2(5) pm, β= 104.58(2)°, mP30 for Cs2[Pd(N3)4] and a = 1041.4(1) pm, b = 1292.9(2) pm, c = 1198.7(1) pm, β= 91.93(1)°, mP102 for Rb2[Pd(N3)4].2/3H2O, respectively. Predominant structural features of both compounds are discrete [PdII(N3)4]2- anions with palladium in a planar coordination by nitrogen, but differing in point group symmetries. The vibrational spectra of the compounds are analyzed based on the idealized, point group C4h, of the spectroscopically relevant unit, [Pd(N 3]2- taking into account the site symmetry splitting due to the symmetry reduction in the solid phase.
The AFeO2 (A=K, Rb and Cs) family: A comparative study of structures and structural phase transitions
Ali, Naveed Zafar,Nuss, Juergen,Sheptyakov, Denis,Jansen, Martin
, p. 752 - 759 (2010/06/13)
Structures and phase transitions for the isostructural series of compounds KFeO2, RbFeO2 and CsFeO2 have been systematically studied by synchrotron X-ray high resolution powder diffraction experiments and in case of CsFeO2 also by single crystal diffractometry. At room temperature, all of the three compounds crystallize in the orthorhombic (Pbca) KGaO2 type of structure consisting of a three dimensional network of corner-sharing [FeO4/2]- tetrahedra, which at elevated temperatures shows a reversible phase transformation to a cubic structure (space group Fd over(3, -) m). For KFeO2, RbFeO2 and CsFeO2 this phase transformation takes place at 1003 K, 737 K and 350 K respectively, as confirmed by differential scanning calorimetry and X-ray diffraction. Upon heating through the transitions the major structural changes are driven by the onset or enhancement of librational motion of the FeO4 tetrahedra. Due to this phenomenon the Fe-O-Fe bonds appear to step-wise getting straight, seemingly approaching 180° within the time and space averaged structure.
