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.
The chain manganates K29Mn17O34, Rb 11Mn8O16, and Cs4Mn 3O6: a new family of mixed-valent one-dimensional transition metallates
Pfeiffer, Steffen,Nuss, Juergen,Jansen, Martin
, p. 23 - 29 (2010/05/01)
Air and moisture sensitive K29Mn17O34, Rb11Mn8O16 and Cs4Mn 3O6 were prepared via the azide/nitrate route from stoichiometric mixtures of the precursors Mn2O3, AN 3 and ANO3 (A = K, Rb, Cs) in special containers provided with silver inlays. Their compositions can be generalized as A xMnO2 with x varying between 1.703 and 1.333. According to the X-ray analysis of the crystal structures [K29Mn 17O34: lma2, Z = 4, a = 93.149(3), b = 10.0063(3), c = 6.0621(2) A, 6585 independent reflections, R1 = 0.053, wR(all) = 0.143; Rb11Mn8O16: F222, Z = 16, a = 12.2096(4), b = 20.1595(7), c = 43.712(2) A, 11534 independent reflections, R1 = 0.042, wR(all) = 0.131; Cs4Mn3O6: C222, Z = 8, a = 12.790(3), b = 21.123(4), c =8.179(2) A, 2212 independent reflections, R1 = 0.051, wR(fall) = 0.122], the main feature of all three crystal structures are 1∞MnO2n- chains built up from partially distorted edge-sharing MnO4 tetrahedra. The alkali metal ions fill the space between the anionic entities forming honeycomb like arrangements. In all cases manganese is in a mixedvalent state but no full charge ordering is noticeable. The variations of the charges along the MnO 2n- chains seem to be best described in terms of charge density waves. The magnetic susceptibilities show the dominance of strong antiferromagnetic interactions for the rubidium and the cesium compounds, whereas ferro- or ferrimagnetic interactions prevail in the potassium compound.
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.
