15587-72-1

Usage

InChI:InChI=1/H2O4S.Rb/c1-5(2,3)4;/h(H2,1,2,3,4);/q;+1/p-2

Upstream product

• 7664-93-9 sulfuric acid 
• 7732-18-5 water 

Relevant academic research and scientific papers

Understanding the Mechanism of Ferroelectric Phase Transition in RbHSO4: A High-Pressure Raman Investigation

Previous high-pressure dielectric and diffraction studies on rubidium hydrogen sulfate (RbHSO4) observed ferroelectric phase transition below 1 GPa pressure. We have performed high-pressure Raman spectroscopy studies on RbHSO4 up to a maximum pressure of 5.15 GPa and at ambient temperature to understand the microscopic origin and mechanism of ferroelectric transition. On the basis of the pressure dependence of Raman mode frequencies and their full-width at half-maxima, we observed a transition around a pressure of 0.3 GPa, similar to the ferroelectric transition discovered in dielectric measurements, followed by another transition around 2.4 GPa. These phase transitions are evident from the appearance/disappearance of Raman-active modes and the change in the slope of frequencies with pressures. From the pressure dependence of the S-O and S-OH frequencies, we deduce that HSO4- ion ordering results in ferroelectric phase transition around 0.3 GPa. Further, the transition around 2.4 GPa pressure is associated with significant changes in the stretching and bending vibrational frequencies and indicates a structural phase transition with possible lowering of the crystal symmetry. Interestingly, no significant changes are observed in the Raman spectrum around 1 GPa, at which a phase transition was noticed in earlier X-ray and dielectric studies.

Synthesis, crystal structure, and vibrational spectra of M 4V2O3(SO4)4 (M = K, Rb, Cs)

Synthesis was performed and physicochemical properties were studied for the M4V2O3(SO4)4 complexes, where M = K, Rb, or Cs. Their crystal structures were determined using the set of data from X-ray diffraction and neutron diffraction studies. All compounds crystallize in a triclinic lattice (space group P1, Z = 2) with the parameters: a = 7.7688(2), 7.8487(1), 8.1234(1) ?; b = 10.4918(3), 10.8750(2), 11.1065(1) ?; c = 11.9783(4), 12.1336(2), and 11.8039(1) ?; α = 76.600(2)°, 77.910(1)°, 79.589(1)°; β = 75.133(2)°, 75.718(1)°, 87.939(1)°; γ = 71.285(2)°, 72.189(1)°, 75.567(1)°; V = 881.78(5), 945.42(3), 1014.34(2) ?3 for K, Rb, Cs, respectively. The structure of M4V2O 3(SO4)4 was found to be formed by discrete complex anions V2O3(SO4) 4 4- incorporating two oxygen-bridged vanadium atoms in a distorted octahedral oxygen environment. The sulfate groups are coordinated by the vanadium atoms in the chelating mode with a large scatter of S-O interatomic distances and OSO angles. Every VO6 octahedron has a short terminal vanadium-oxygen bond with a length of about 1.6?. The V2O 3(SO4) 4 4- complex anions in potassium and rubidium compounds differ from that in Cs4V 2O3(SO4)4 in the type of symmetry and mutual spatial orientation. The vibrational spectra were presented and interpreted in line with the structural analysis data.

Phase ratios in the M2O-V2O5-SO 3 (M = Rb, Cs) systems and the properties of the compounds formed in these systems

Powder X-ray diffraction and microscopy have been used to study phase ratios of the M2O-V2O5-SO3 (M = Rb, Cs) systems, which model the active component of rubidium-vanadium and cesium-vanadium catalysts for sulf

Synthesis, structure, and properties of M3VO2(SO 4)2 (M = Rb, Cs)

Vanadium(V) complexes of general composition M3VO 2(SO4)2 (M = Rb, Cs) were synthesized by a solid-state route. The individuality of the synthesized compounds was proved by X-ray and neutron diffraction, vibrational spectroscopy, and microscopic analysis. The X-ray diffraction patterns of M3VO2(SO 4)2 were indexed to fit the monoclinic system (space group P2/c, Z = 4) with the following unit cell parameters: a = 11.6487(2) ?, b = 8.4469(2) ?, c = 12.1110(2) ?, β = 109.483(1)°, V = 1123.43 ?3 (Rb); a = 12.0546(3) ? b = 8.7706(2) ?, c = 12.6496(3) ?, β = 109.843(2)°, V = 1257.99 ?3 (Cs). In the crystal structure of M3VO 2(SO4)2, [VO2(SO4) 2]3- complex anions can be discerned in which the vanadium atom is surrounded by five oxygen atoms: two oxygen atoms form short terminal V-O bonds, and three oxygen atoms are from the two sulfato groups, one of which acts as a monodentate ligand and the other acts as a bidentate chelating ligand.

Synthesis and structure determination of Rb2(HSO4)(H2PO4) and Rb4(HSO4)3(H2PO4) by x-ray single crystal and neutron powder diffraction

Two new compounds, Rb2(HSO4)(H2PO4) and Rb4(HSO4)3 (H2PO4), were synthesized from aqueous solutions of RbHSO4/RbH2PO4. The compounds were characterized by X-ray single crystal analysis and neutron powder diffraction. For Rb2(HSO4)(H2PO4), room temperature and a low temperature modification were found. According to X-ray crystal structure analysis, the compounds have the following crystal data: Rb2(HSO4)(H2PO4) (T = 298 K), monoclinic, space group P21/n, a = 7.448(3) A, b = 7.552(2) A, c = 7.632(3) A, β = 100.47(3)°, V = 422.1(3) A3, Z = 2, R1 = 0.033; Rb2(HSO4)(H2PO4) (T = 160K), monoclinic, space group P21/c, a = 11.555(3) A, b = 7.536(2) A, c = 9.593(2) A, β = 91.56(2)°, V = 853.0(4) A3, Z = 4, R1 = 0.041; Rb4(HSO4)3(H2PO4), orthorhombic, space group P21212, a = 7.612(6) A, b = 14.795(9) A, c = 7.446(4) A, V = 838.6(9) A3, Z = 2, R1 = 0.045. The compounds have different coordination numbers of rubidium, being 7, 8, 9, or 10 with Rb-O distances from 2.9 to 3.3 A. In all cases there were difficulties in the allocation of sulfur and phosphorus due to the small differences in their radii and scattering factors. All structures are characterized by HSO4- and H2PO4-, or disordered H(x)S/PO4- tetrahedra connected to zigzag chains via hydrogen bridges. These chains are linked by additional hydrogen bonds to a layer-like hydrogen bonding system. (C) 2000 Academic Press.