X-ray crystal structures of the 1,3,2-benzodithiazolyl dimer and 1,3,2-benzodithiazolium chloride sulfur dioxide solvate: comparison of the molecular and electronic structures of the 10-.pi.-electron C6H4S2N+ cation and the C6H4S2N.bul. radical and dimer and a study of the variable-temperature magnetic behavior of the radical

1990 ◽  
Vol 29 (23) ◽  
pp. 4821-4830 ◽  
Author(s):  
Edward G. Awere ◽  
Neil Burford ◽  
Robert C. Haddon ◽  
Simon Parsons ◽  
Jack Passmore ◽  
...  
Keyword(s):  
Sulfur Dioxide ◽  
Crystal Structures ◽  
Electronic Structures ◽  
Variable Temperature ◽  
Magnetic Behavior ◽  
X Ray

Crystal Structures and Superconductivity in the La1.5−xBa1.5+Cu7+ySystem

1987 ◽  
Vol 99 ◽  
Author(s):  
JE. Greedan ◽  
A. H. O'Reilly ◽  
C. V. Stager ◽  
F. Razavi ◽  
W. Abriel
Keyword(s):  
Crystal Structures ◽  
Variable Temperature ◽  
Meissner Effect ◽  
Powder Diffraction Data ◽  
Solution System ◽  
X Ray ◽  
Neutron Powder Diffraction Data ◽  
Solid Solution System ◽  
Copper Valence ◽  
Flowing Oxygen

ABSTRACTMembers of the solid solution system La1.5−xBa1.5+Cu7+ywith x = 0, 0.125, 0.25. 0.375 and 0.5 have been prepared both in air and under one atmosphere of flowing oxygen. In general, except for x =0, the oxygen annealed compounds are superconducting while the air-annealed samples are semiconductors. Tc's measured by Meissner effect and resistivity data range to 70K. The crystal symmetry in all cases is apparently tetragonal as verified for x = 0.375 by variable temperature Guinier x-ray experiments at temperatures down to 8K. Crystal structures have been refined from neutron powder diffraction data. A correlation is noted between Cu-0 distances which connect adjacent Cu planes - the average copper valence and the occurrence of superconductivity.

Molecular reorientation in a dehydration process of an organic polar salt of 2,4-diaminotoluene/L(+)-tartaric acid

2017 ◽  
Vol 32 (1) ◽  
pp. 15-22
Author(s):  
Weicai Ju ◽  
Simin Qiu ◽  
Yaqiu Tao ◽  
Xiaodong Shen ◽  
Zhigang Pan
Keyword(s):  
Crystal Structures ◽  
Tartaric Acid ◽  
Variable Temperature ◽  
Ethanol Dehydration ◽  
X Ray Diffraction ◽  
Molecular Reorientation ◽  
X Ray ◽  
Hydrate Crystal ◽  
Dehydration Behavior

An organic polar hydrate was obtained through cocrystallization of 2,4-diaminotoluene (2,4-DAT) and L(+)-tartaric acid (TA) from ethanol. Dehydration behavior of the obtained hydrate was investigated using variable temperature powder X-ray diffraction (PXRD) and thermal analysis. Proton transfer from L(+)-TA to 2,4-DAT in both hydrate and dehydrated form was revealed via Fourier transform infrared spectroscopy. The crystal structures of both forms were determined using PXRD techniques. The similarities and differences between two crystal structures were analyzed and the role of water in the hydrate crystal structure was demonstrated.

scholarly journals Effect of thickness and Si substrate morphology in La0.7Sr0.3MnO3/Si thin films

2014 ◽  
Vol 70 (a1) ◽  
pp. C1532-C1532
Author(s):  
Hsiao-Tsu Wang ◽  
Mau- Kuen Wu ◽  
Yu-Cheng Shao ◽  
Yu-Fu Wang ◽  
Shang-Hsien Hsieh ◽  
...  
Keyword(s):  
Thin Films ◽  
Magnetic Properties ◽  
Electronic Structures ◽  
Magnetic Circular Dichroism ◽  
Magnetic Behavior ◽  
Si Substrate ◽  
Edge Structure ◽  
X Ray ◽  
X Ray Absorption ◽  
Different Thickness

Investigation has been made on atomic, electronic structures and magnetic properties of La0.7Sr0.3MnO3 (LSMO) on Si substrate. The effect of different thickness of LSMO and different morphological [flat and nano-pyramid (NP)] of Si substrate are studied in present work. The result of Mn K-edge extended x-ray absorption fine structure indicates the more disorder of local atomic structure of first shell (Mn-O bound) in the thinner LSMO/Si film. The Mn L3,2-edge x-ray absorption near-edge structure shows the presence of Mn2+ ion on the sample. Furthermore, the Mn L3,2-edge x-ray magnetic circular dichroism reveals that the thinner film (LSMO/Si) has highest magnetic moment, in comparison to that of thick LSMO/Si and LSMO/Si-NP samples. This finding suggests that the appearance Mn2+ may play an important role in magnetic behavior of hetero-junction LSMnO/Si and Si-NP.

Iridium(I) complexes containing bidentate pyrazolylgallate ligands. X-ray crystal structures of [Me2Gapz2]Ir(COD), [Ir(μ-pz)(CO)2]2, and [Ir(μ-3,5-Me2pz)(CO)2]2

1985 ◽  
Vol 63 (3) ◽  
pp. 692-702 ◽  
Author(s):  
Sophia Nussbaum ◽  
Steven J. Rettig ◽  
Alan Storr ◽  
James Trotter
Keyword(s):  
Crystal Structures ◽  
Variable Temperature ◽  
Hydrogenation Reaction ◽  
Synthesis And Characterization ◽  
Nmr Studies ◽  
X Ray ◽  
H Nmr ◽  
Measurable Activity

The synthesis and characterization of a number of Ir(I) complexes incorporating bidentate, chelating, pyrazolylgallate ligands are described. Non-rigidity for some of the complexes in solution has been demonstrated by variable temperature 1H nmr studies. Crystal structures of three complexes, [Me2Gapz2]Ir(COD), [Ir(μ-pz)(CO)2]2, and [Ir(μ-3,5-Me2pz)(CO)2]2 are reported and confirm the expected boat conformations for the six-membered M—(N—N)2—Ir rings (where M = Ir or Ga) in the compounds. One of the complexes studied has exhibited measurable activity as a catalyst in the hydrogenation reaction of cyclohexene.

B(C6F5)3-guided cyclotrimerization-rearrangement of phenylacetylene. Evidence of the (C6F5)3B−–C(H)=C+Ph intermediate in a 1,1-carboboration reaction

2016 ◽  
Vol 71 (10) ◽  
pp. 1029-1041
Author(s):  
Wanli Nie ◽  
Guofeng Sun ◽  
Chong Tian ◽  
Maxim V. Borzov
Keyword(s):  
Nmr Spectroscopy ◽  
Diffraction Analysis ◽  
Crystal Structures ◽  
Variable Temperature ◽  
Spectroscopy Study ◽  
X Ray Diffraction ◽  
X Ray ◽  
Spectral Evidence ◽  
A Minor ◽  
Zwitterionic Intermediate

AbstractIn presence of 2,2,6,6-tetramethylpiperidinium ([TMPH]+) chlorotris(pentafluorophenyl)borate ([TMPH]+[ClB(C6F5)3]−, 3), phenylacetylene undergoes an unusual cyclotrimerization-rearrangement leading to tris(pentafluorophenyl)(3,4,5-triphenylphenyl)borate anion (1) as a minor product which can be isolated and purified in a form of salts [1·(TMPH)n·Cl(n–1)] (n=3 or 5). A variable temperature and concentration NMR spectroscopy study of 3 in CDCl3 unambiguously demonstrated its ability to liberate free B(C6F5)3, which initiates cyclotrimerization and guides rearrangements towards formation of the tetraarylborate anion 1. For the previously studied “spectator” reaction between phenylacetylene and B(C6F5)3 in CDCl3, 1H, 19F, and 11B NMR-spectral evidence of the (C6F5)3B−–C(H)=C+Ph zwitterionic intermediate of the 1,1-carboboration reaction has been demonstrated. The crystal structures of [1·(TMPH)3·Cl2], the salt 3, and a 1:1 adduct of 1,3,5-tris(4-fluorophenyl)benzene and 2,4,6-tris(pentafluorophenyl)-1,3,5,2,4,6-trioxatriborinane (2) have been established by X-ray diffraction analysis.

scholarly journals A 3D Silverton-Type Polyoxomolybdate Based on {PrMo12O42}: Synthesis, Structure, Photoluminescence and Magnetic Properties

2021 ◽  
Vol 9 ◽  
Author(s):  
Yanxin Zhao ◽  
Xiaopeng Sun ◽  
Yanfang Ji ◽  
Hui Kong ◽  
Shumin Chen ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Variable Temperature ◽  
Three Dimensional ◽  
Magnetic Behavior ◽  
X Ray Diffraction ◽  
Red Emission ◽  
X Ray ◽  
Variable Temperature Magnetic Susceptibility ◽  
Elemental Analyses ◽  
Inorganic Building Block

A three-dimensional (3D) Silverton-type polyoxomolybdate (POMo) with the formula of NH4{Mn4[PrMo12O42]}·18H2O (1) was successfully isolated and well characterized by single crystal X-ray diffraction, X-ray powder diffraction pattern, infrared spectrum, thermogravimetric and elemental analyses. The inorganic building block {PrMo12O42} has formed 3D frameworks via the {MnO6} linker. The excitation of compound 1 in solid state at 375 nm displays red emission. Moreover, variable temperature magnetic susceptibility measurements indicate that the magnetic behavior in compound 1 is dominated by antiferromagnetic interactions.

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