A5034974356- Chemical Synthesis and Characterization
- Zeolite Catalysis and Synthesis
- Crystal Structures and Properties
- Luminescence Properties of Advanced Materials
- X-ray Diffraction in Crystallography
- Mesoporous Materials and Catalysis
- Nuclear materials and radiation effects
- Inorganic Chemistry and Materials
- Crystallization and Solubility Studies
- Polyoxometalates: Synthesis and Applications
- Radioactive element chemistry and processing
- Solid-state spectroscopy and crystallography
- Metal-Organic Frameworks: Synthesis and Applications
- Perovskite Materials and Applications
- Quantum Dots Synthesis And Properties
- Spectroscopy and Quantum Chemical Studies
- Metal complexes synthesis and properties
- Layered Double Hydroxides Synthesis and Applications
- Clay minerals and soil interactions
- Vanadium and Halogenation Chemistry
- Radiation Detection and Scintillator Technologies
- Synthesis and pharmacology of benzodiazepine derivatives
- Catalytic Processes in Materials Science
- Porphyrin and Phthalocyanine Chemistry
- Cancer Treatment and Pharmacology
Kyungpook National University
2014-2024
University of Hawaii System
1988-1997
University of Hawaiʻi at Mānoa
1997
Boston College
1993
Chonnam National University
1992
Keimyung University
1992
The room-temperature charge carrier mobility and excitation-emission properties of metal halide perovskites are governed by their electronic band structures intrinsic lattice phonon scattering mechanisms. Establishing how carriers interact within this scenario will have far-reaching consequences for developing high-efficiency materials optoelectronic applications. Herein we evaluate the conduction environment double perovskite Cs2AgBiBr6 via a combinatorial approach; single crystal X-ray...
The structure of a single crystal fully Cs+-exchanged, dehydrated zeolite ZSM-5 (MFI, Cs3.8Al3.8Si92.2O192, Si/Al = 24) has been determined crystallographically using synchrotron X-radiation in the orthorhombic space group Pnma (a 20.070(1), b 19.913(1), c 13.389(1) Å) and refined to R1 0.076 with 5443 reflections. A total 3.5(2) Cs+ ions were found per unit cell scattered among 11 distinct positions. Three are within intersection volume (the that is both zigzag channel (ZC) straight (SC)),...
2-Bromobenzaldehydes react with arylhydrazines in toluene at 100 [degree]C the presence of a catalytic amount palladium catalyst and phosphorus chelating ligands such as 1,1[prime or minute]-bis(diphenylphosphino)ferrocene 1,3-bis(diphenylphosphino)propane along NaO-t-Bu to afford 1-aryl-1H-indazoles good yields.
A cesium continuum that fills the channels and cavities of zeolite X has been prepared, its structure determined by single-crystal x-ray crystallography. The three-dimensional is cationic to balance negative charge framework. Its valence electrons, only 0.3 per Cs + ion, are widely delocalized over 95 percent ions in crystal. a unit cell formula (Cs 122 ) 86+ contains 13 14 clusters (one supercage) arranged like atoms diamond, with one 2 appendix (in sodalite cavity) cluster.
Commercially available molecular rotor (MR) compounds were recrystallized using chiral monoterpenes as solvents. The resulting crystals exhibited large circular dichroism signals with opposing signs according to the handedness of solvent used. X-ray crystallographic analysis showed that chirality originated from asymmetric restriction intramolecular rotation in crystals. also highly emissive due restricted bond rotation, while solutions materials almost nonemissive. solvent-to-MR transfer...
A spatially ordered quantum dot array of cationic indium nanoclusters has been synthesized in a single crystal zeolite X. fully dehydrated and indium-exchanged X (ca. In87Si100Al92O384, In87−X) was exposed to 0.5 atm H2S for 12 h at 673 K. After it evacuated temperature cooled 294 K, the structure product In66Si100Al92O384, In66−X, = 24.942(4) Å) determined by X-ray diffraction techniques cubic space group Fd3̄m. It refined with all measured reflections final error index R1 0.058 754 Fo >...
Fully indium-exchanged zeolite X has been prepared by solvent-free redox ion-exchange of fully dehydrated Tl+-exchanged with In metal at 350 °C. Electron-probe microanalysis and single-crystal X-ray diffraction showed the product to be an indium aluminosilicate (ca. 47 wt % In) free thallium. The crystal structure initial (In88Si100Al92O384, Fd3̄ a = 24.913(2) Å, 1) that after washing redehydration (In87Si100Al92O384, Fd3̄m 24.916(3) 2) were determined crystallography 21 They refined all...
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTReaction of dehydrated Na12-A with cesium. Synthesis and crystal structure fully dehydrated, cesium ion-exchanged zeolite ANam Ho Heo Karl SeffCite this: J. Am. Chem. Soc. 1987, 109, 26, 7986–7992Publication Date (Print):December 1, 1987Publication History Published online1 May 2002Published inissue 1 December 1987https://pubs.acs.org/doi/10.1021/ja00260a008https://doi.org/10.1021/ja00260a008research-articleACS PublicationsRequest reuse...
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTA Cationic Cesium Continuum in Zeolite XTao Sun, Karl Seff, Nam Ho Heo, and Vitalii P. PetranovskiiCite this: J. Phys. Chem. 1994, 98, 22, 5768–5772Publication Date (Print):June 1, 1994Publication History Published online1 May 2002Published inissue 1 June 1994https://pubs.acs.org/doi/10.1021/j100073a033https://doi.org/10.1021/j100073a033research-articleACS PublicationsRequest reuse permissionsArticle Views124Altmetric-Citations42LEARN ABOUT THESE...
Five single crystals of vacuum-dehydrated Ni2+-exchanged zeolite Y (Ni−Y) were variously prepared by the exchange Na−Y or K−Y (Na71− K71−Si121Al71O384, Si/Al = 1.69) with Ni2+ using flowing aqueous 0.05 M Ni(NO3)2 at 294 353 K, followed vacuum dehydration 2.0 × 10−6 Torr and 623 723 K. Their crystal structures chemical compositions determined synchrotron X-radiation energy dispersive X-ray (EDX) analyses to give Nin−Y, where 25.3 ≤ n 34.1 per unit cell:...
Nanocrystals (NCs) of CsPbX3 , X = Cl, Br, or I, have excellent photoluminescent properties: high quantum yield, tunable emission wavelengths (410-700 nm), and narrow band widths. CsPbBr3 NCs show promise as a green-emitting material for use in wide color gamut displays. have, however, not been commercialized because they are sensitive to moisture heat. To avoid these problems, this work attempts introduce into five zeolites. The zeolite product, Pb,Br,H,Cs,Na-X, shows superior stability...
The structures of the fully exchanged, dehydrated zeolites Tl−ZSM-5 (a = 20.064(1), b 19.946(1), c 13.416(1) Å) and H−ZSM-5 20.079(1), 19.948(1), 13.419(1) have been determined crystallographically using modestly twinned single crystals synchrotron X-radiation. They were refined in orthorhombic space group Pnma to R1 0.071 0.066 with 3962 4278 reflections, respectively, for which Fo > 4σ(Fo). geometry zeolite framework both (MFI, Al3.2Si92.8O192, Si/Al 29) is very similar that earlier...
Single crystals of fully dehydrated and <TEX>$Ca^{2+}$</TEX>-exchanged zeolites A (|<TEX>$Ca_6$</TEX>|[<TEX>$Si_{12}Al_{12}O_{48}$</TEX>]-LTA) X (|<TEX>$Ca_{46}$</TEX>| [<TEX>$Si_{100}Al_{92}O_{384}$</TEX>]-FAU) were brought into contact with Te in fine pyrex capillaries at 623 K 673 K, respectively, for 5 days. Crystal structures Te-sorbed have been determined by single-crystal X-ray diffraction techniques 294 the cubic space group Pm<TEX>$\overline{3}$</TEX> m (a = 12.288(2)...
New small molecules and cations have been synthesized within silver-containing zeolites, their structures were determined using single-crystal crystallography. Some of them are the hydronitrogens N3H5 cyclo-N3H3, octahedral Ag6, silver halide clusters Ag4Cl4, Ag4Br4, Ag4I4. The zeolites ordered three-dimensional arrangements identical quantum dots. (C3O3H3)22+ cation is a reduced dimer C3O3H33+ (tripyrylium); tripyrylium planar isoelectronic with benzene. two rings bond together facially via...
Abstract Abstract: 2-Bromobenzaldehyde reacts diastereoselectively with chiral alkanolamines under carbon monoxide in the presence of a catalytic amount bis(triphenylphosphine)palladium(II) chloride to afford corresponding tricyclic isoindolinones moderate good yields. Notes Crystal data for 12: C15H13NO2, M, = 217.2595, orthorhombic, a, 8.094(2), b, 9.625(2), c, 14.959(3) Å, V, 1165.3(4) Å3 (by least-squares analysis 25 reflections), T, 294 K, space group P212121 (#19), graphite...
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCrystal structure of zeolite 4A ion exchanged to the limit its stability with nickel(II)Nam Ho Heo, Wyona V. Cruz-Patalinghug, and Karl SeffCite this: J. Phys. Chem. 1986, 90, 17, 3931–3935Publication Date (Print):August 1, 1986Publication History Published online1 May 2002Published inissue 1 August 1986https://pubs.acs.org/doi/10.1021/j100408a021https://doi.org/10.1021/j100408a021research-articleACS PublicationsRequest reuse permissionsArticle...
The polyatomic tetrahydroxytetraindium(III) cations, In4(OH)48+, have been synthesized in 94% of the sodalite cavities zeolite Y (FAU, Si/Al = 1.69). In−Y (|In57.8[In5]1.8|[Si121Al71O384]−FAU or In66.8−Y) was prepared by oxidative solid state ion exchange (OSSIE) method from In0 and single crystals Tl−Y under anhydrous conditions at 623 K. One these exposed to atmosphere then zeolitically dry oxygen, both K, give In−Y[In4(OH)4] (|In7.6[In4(OH)4]7.5[In(OH)2]2.0|[Si121Al71O384]−FAU...