Molten flux synthesis, single crystal X-ray structure and ion-exchange properties of the first polythiogallate, CsGaS3

2002 ◽  
pp. 4751 ◽  
Author(s):  
M. Suseela Devi ◽  
K. Vidyasagar
Keyword(s):  
Ion Exchange ◽  
Single Crystal ◽  
X Ray ◽  
Flux Synthesis ◽  
Molten Flux ◽  
Exchange Properties

scholarly journals Darstellung von μ-Nitroso-bis(pentahydro-closo-hexaborat)(3-) und Kristallstruktur von Cs3[B6H5(NO)B6H5] / Preparation of μ-nitroso-bis(pentahydro-closo-hexaborate)(3-) and crystal structure of Cs3[B6H5(NO)B6H5]

1994 ◽  
Vol 49 (9) ◽  
pp. 1263-1266 ◽  
Author(s):  
A. Franken ◽  
W. Preetz
Keyword(s):  
Crystal Structure ◽  
Ion Exchange ◽  
Single Crystal ◽  
Diffraction Analysis ◽  
Ion Exchange Chromatography ◽  
Exchange Chromatography ◽  
X Ray Diffraction ◽  
Orthorhombic Space Group ◽  
X Ray ◽  
Diethylaminoethyl Cellulose

By electrochemical oxidation of [B6H6]2- in the presence of nitrite ions and of the base DBU in dichlorom ethane solution the μ-nitroso-bis(pentahydrohexaborate) [B6H5(NO)B6H5]3- ion is formed and can be isolated by ion exchange chromatography on diethylaminoethyl cellulose. The crystal structure of the Cs salt has been determined from single crystal X-ray diffraction analysis. Cs3[B6H5(NO)B6H5] is orthorhombic, space group Pnma with a = 16.2303(13), b = 12.245(6), c = 25.444(2) Å. The unit cell contains three crystallographically independent anions with nearly C2v symmetry but differently distorted B6 cages

Synthesis and Characterization of Novel Inorganic Microporous Beryllophosphates

1992 ◽  
Vol 57 (4) ◽  
pp. 794-798 ◽  
Author(s):  
Long Yu ◽  
Wenqin Pang
Keyword(s):  
Ion Exchange ◽  
Synthesis And Characterization ◽  
X Ray Diffraction ◽  
Factors Affecting ◽  
X Ray ◽  
Earth Cation ◽  
Diffraction Patterns ◽  
Unique Framework ◽  
Exchange Properties

Five new types of microporous beryllophosphates were hydrothermally synthesized using BeO-P2O5-R-MCl (or MCl2)-H2O, R being cyclohexylamine (CHA), pyrrolidine, 1-butylamine or triethylamine, M alkali or alkali earth cation. X-Ray diffraction patterns (XRD), infrared (IR), TG-DT and elemental analysis show that the crystalline beryllophosphates have novel, unique framework structures, composed from basic units of tetrahedral PO4 and BeO4. These materials exhibit zeolite-like adsorption and ion-exchange properties. Factors affecting the product crystallization (as e.g. pH), type of cation and composition of reaction mixture are discussed.

Single-Crystal Mesostructured Semiconductors with CubicIa3̄dSymmetry and Ion-Exchange Properties

2002 ◽  
Vol 124 (41) ◽  
pp. 12255-12260 ◽  
Author(s):  
Pantelis N. Trikalitis ◽  
Krishnaswamy K. Rangan ◽  
Thomas Bakas ◽  
Mercouri G. Kanatzidis
Keyword(s):  
Ion Exchange ◽  
Single Crystal ◽  
Exchange Properties

scholarly journals Ion-exchange properties of solid solutions based on hydrated forms of monovalent metals antimonate-tungstates

2020 ◽  
Vol 62 (6) ◽  
pp. 74-79
Author(s):  
Olga A. Firsova ◽  
◽  
Elena M. Filonenko ◽  
Yulia A. Lupitskaya ◽  
Hurshid N. Bozorov ◽  
...  
Keyword(s):  
Ir Spectroscopy ◽  
Ion Exchange ◽  
Solid Solutions ◽  
Rietveld Method ◽  
Type Structure ◽  
Water Molecules ◽  
X Ray Diffraction ◽  
X Ray ◽  
Pyrochlore Type ◽  
Exchange Properties

The research of tungsten-antimony crystalline acid (TACA) structural transformations in the condition of ion-exchange and thermolysis of its substituted M+, H+-forms (M+ – Li, Na, K, Ag) were conducted. The data of thermogravimetric and qualitative X-ray phase analyses made it possible to conclude that the thermolysis of TACA and its derivatives proceeds in a wide temperature range from 300 to 1150 K being accompanied by the removal of crystalline water molecules with the formation of phases mixture containing complex antimony oxides of the ( -,  - Sb2O4) modification and WO3. It was shown that compounds based on hydrated forms of monovalent metal antimonates-tungstates are stable up to 1023 K with a pyrochlore-type structure. For pyrochlore-like phases, a monotonic dependence of unit cell parameter a on ion-exchange degree α and the ionic radius of metals r was revealed indicating the formation of solid solutions Мх(Н3О)1–хWSbO6 nН2О (M+ – Li, Na, K, Ag; 0.0≤х<1.0; 0.0≤n<2.0) with a limited range of solubility from the crystal chemistry point of view. Within the framework of the Fd-3m space group, based on the data of X-ray diffraction analysis (Rietveld method), the structural characteristics of TACA and its substituted M+, H+-forms were refined, and a model for populating the corresponding metal ions by crystallographic positions of the pyrochlore-type structure was proposed. Using a complex of physicochemical methods (thermogravimetric, X-ray diffraction analyses and IR spectroscopy), a correlation between the composition of the obtained compounds, structural disorder, and ion-exchange properties were determined. According to the data of thermogravimetry and IR spectroscopy, it follows that the degree of compounds hydration analyzed depends on the nature of the alkaline ion. This allows to conclude that lithium and sodium ions are located in 16d– positions, dragging neutral water molecules into the structure occupying 8b-positions. In this case, potassium ions can partially occupy both 16d- and 8b-positions of the structure.

Erstmalige Charakterisierung der Ammoniak-Proton-Komplexe [(NH3)3H]+ und [(NH3)4H]+ in den Kristallstrukturen von (NH4)3AsS4 · 5 NH3 und (NH4)3SbS4 · 8 NH3 / First Characterization of the Ammonia-Proton-Complexes [(NH3)3H]+ and [(NH3)4H]+ in the Crystal Structures of (NH4)3AsS4 · 5 NH3 and (NH4)3SbS4 · 8 NH3

2003 ◽  
Vol 58 (7) ◽  
pp. 672-677 ◽  
Author(s):  
Thomas Roßmeier ◽  
Nikolaus Korber
Keyword(s):  
Low Temperature ◽  
Ion Exchange ◽  
Hydrogen Bonds ◽  
Single Crystal ◽  
Liquid Ammonia ◽  
Ammonium Ion ◽  
X Ray ◽  
Exchange Material ◽  
First Time

The compounds (NH4)3AsS4· 5 NH3 (1) and (NH4)3SbS4· 8 NH3 (2) were prepared by the reaction of Na3AsS4 and Na3SbS4 with a proton-charged ion exchange material in liquid ammonia and characterized by low temperature single crystal X-ray structure analysis. The ammonium-ammoniates show H3N-H···N-hydrogen bonds between the ammonium ion and ammonia molecules ranging from 1.86 to 2.55 Å (DHA-angles: 145 - 173°) and H3N-H···S-bonds to the thioanions between 2.36 and 2.97 Å (DHA-angles: 130 - 176°). The former of the interactions are responsible for the formation of [(NH3)2H]+, [(NH3)3H]+ and [(NH3)4H]+-complexes, the last two of which were characterized by X-ray analysis for the first time.

scholarly journals Studies on Ion-Exchange Properties of Polyaniline Zr(IV) Tungstoiodophosphate Nanocomposite Ion Exchanger

2013 ◽  
Vol 2013 ◽  
pp. 1-12 ◽  
Author(s):  
K. Jacinth Mispa ◽  
P. Subramaniam ◽  
R. Murugesan
Keyword(s):  
Ion Exchange ◽  
Material Science ◽  
Sol Gel ◽  
Ion Exchanger ◽  
X Ray Diffraction ◽  
X Ray ◽  
Antimicrobial Studies ◽  
Visible Spectra ◽  
Exchange Behaviour ◽  
Exchange Properties

Organic-inorganic hybrid materials prepared by sol-gel approach have attracted a great deal of attention in material science. Organic polymeric part of the composite provides mechanical and chemical stability whereas the inorganic part supports the ion-exchange behaviour and thermal stability and also increases the electrical conductivity. Such modified composite materials can be applied as an electrochemically switchable ion exchanger for water treatment, especially water softening. Polyaniline zirconium(IV) tungstoiodophosphate nanocomposite ion exchanger is prepared by sol-gel method. Polyaniline zirconium(IV) tungstoiodophosphate nanocomposite ion exchanger is synthesized and characterized by Fourier transform-infrared spectra, ultraviolet-visible spectra, X-ray diffraction, scanning electron microscopy, thermogravimetric analysis, ion exchange, conductivity, and antimicrobial studies. A mechanism for the formation of the polyaniline zirconium(IV) tungstoiodophosphate nanocomposite ion exchanger was discussed. The route reported here may be used for the preparation of other nanocomposite ion exchangers.

Synthesis, characterization, and luminescence modulation of a rare barium-tetracarboxylate framework with I2O1 connectivity

CrystEngComm ◽  
2014 ◽  
Vol 16 (37) ◽  
pp. 8706-8709 ◽  
Author(s):  
Xiao Chen ◽  
Sha He ◽  
Feiyan Chen ◽  
Yunlong Feng
Keyword(s):  
Thermal Stability ◽  
Ion Exchange ◽  
Single Crystal ◽  
Luminescence Intensity ◽  
High Thermal Stability ◽  
Solvothermal Reaction ◽  
Tetracarboxylic Acid ◽  
X Ray ◽  
Organic Framework

Solvothermal reaction of a tetracarboxylic acid with Ba(NO3)2 afforded a barium–organic framework whose single crystal X-ray structure was characterized to have I2O1 connectivity and 1 D channels 15.1 Å in diameter. This MOF has high thermal stability up to 540 °C, and its luminescence intensity can be modulated by ion exchange.

X-ray diffractometry investigation for ion-exchange properties on alpha-type manganese dioxides

1996 ◽  
Vol 11 (4) ◽  
pp. 1030-1036 ◽  
Author(s):  
Yasuo Tanaka
Keyword(s):  
Ion Exchange ◽  
Manganese Dioxide ◽  
X Ray ◽  
Two Samples ◽  
The Difference ◽  
Alpha Type ◽  
Exchange Properties

Two materials of α-type manganese dioxide were synthesized and examined. They were prepared by the pyrolysis of mixtures of MnCO3 and (CH3)3COK. An ill-ordered material was obtained when prepared at large (CH3)3COK content. Both samples behave as acids, but their apparent capacities are obviously different: about 0.9 meq/g for a well-ordered sample and about 2.6 meq/g for an ill-ordered sample. Ion-exchange properties were examined on Kielland's plot. Zero intersections of the two samples are almost the same but slopes are different (about −50 for a well-ordered sample and about −10 for an ill-ordered sample). The difference in slope is likely caused by the flexibility. An evidence of the flexibility can be seen by x-ray diffractometry.

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