Comparison of the NMR coupling paths in leucodrin and conocarpin by low-temperature X-ray structure analysis

1991 ◽  
pp. 695 ◽  
Author(s):  
D. G. Billing ◽  
J. C. A. Boeyens ◽  
L. Carlton ◽  
D. C. Levendis ◽  
G. W. Perold
Keyword(s):  
Low Temperature ◽  
Structure Analysis ◽  
X Ray

X-ray and neutron diffraction investigation at 298 K of NH4I · NH3 and ND4I · ND3 containing the cation H3N – H … NH3+ and D3N – D … ND3+

1992 ◽  
Vol 200 (3-4) ◽  
Author(s):  
H. J. Berthold ◽  
E. Vonholdt ◽  
R. Wartchow ◽  
T. Vogt
Keyword(s):  
Crystal Structure ◽  
Low Temperature ◽  
Neutron Diffraction ◽  
Single Crystal ◽  
Structure Analysis ◽  
Crystal Structure Analysis ◽  
Single Crystal Structure ◽  
X Ray ◽  
Single Crystal Structure Analysis

AbstractNHA single crystal structure analysis of NThe deuterated compound NThe structures of the ordered low temperature phases will be reported separately.

Low-Temperature X-Ray Structure Analysis of 1-Benzothiepin

1976 ◽  
Vol 15 (5) ◽  
pp. 297-297 ◽  
Author(s):  
Noritake Yasuoka ◽  
Yasushi Kai ◽  
Nobutami Kasai ◽  
Toshio Tatsuoka ◽  
Ichiro Murata
Keyword(s):  
Low Temperature ◽  
Structure Analysis ◽  
X Ray

scholarly journals Crystal Structure and Dielectric Property of Endohedral Lithium Fullerene

2014 ◽  
Vol 70 (a1) ◽  
pp. C195-C195
Author(s):  
Shinobu Aoyagi ◽  
Kunihisa Sugimoto ◽  
Hiroshi Okada ◽  
Norihisa Hoshino ◽  
Tomoyuki Akutagawa
Keyword(s):  
Crystal Structure ◽  
Phase Transition ◽  
Dielectric Property ◽  
Low Temperature ◽  
Dielectric Permittivity ◽  
Single Crystal ◽  
Temperature Dependence ◽  
Structure Analysis ◽  
X Ray ◽  
Dielectric Phase

Endohedral lithium fullerene Li+@C60 can have a dielectric polarization by the off-centered location of the Li+ cation inside the C60 cage. The x-ray structure analysis of the PF6– salt [Li@C60](PF6) revealed that the Li+ cation occupies two off-centered equivalent positions at 20 K and hence the crystal is non-polar [1]. The disordered structure at low temperature is explained by a static orientation disorder of polar Li+@C60 cations and/or a dynamic tunneling of the Li+ cation inside the C60 cage. The Li+ tunneling would be suppressed by an intermolecular interaction at lower temperature and a dielectric phase transition might be induced. We reveal the dielectric property and crystal structure of [Li@C60](PF6) below 20 K in this study. The temperature dependence of the dielectric permittivity was measured for the single crystal down to 9 K. The dielectric permittivity increases with decreasing temperature according to the Curie-Weiss law. Such a behavior was also observed in H2O@C60 crystal but not in empty C60 crystal [2]. No dielectric phase transition was observed in H2O@C60 down to 8 K. In contrast, a dielectric anomaly suggesting a phase transition was observed in [Li@C60](PF6) around 18 K. The single-crystal x-ray diffraction experiment below 20 K was also performed at SPring-8 BL02B1. The crystal has a cubic structure at 20 K [1]. The temperature dependence of the cubic lattice constant shows no anomaly around 18 K. However, diffraction peaks that are forbidden for the given structure appear below 18 K. Thus the crystal symmetry is lowered by the dielectric phase transition. We present the result of the crystal structure analysis of the newly discovered low-temperature phase.

Beiträge zur Chemie des Bors, 168 [1] Synthese und Struktur von Azadiboriridinen / Contributions to the Chemistry of Boron, 168 [1] Synthesis and Structure of Azadiboriridines

1986 ◽  
Vol 41 (1) ◽  
pp. 32-37 ◽  
Author(s):  
Franz Dirschl ◽  
Elisabeth Hanecker ◽  
Heinrich Nöth ◽  
Wilfried Rattay ◽  
Walter Wagner
Keyword(s):  
Low Temperature ◽  
Structure Analysis ◽  
Ring System ◽  
The Other ◽  
Ring Plane ◽  
X Ray ◽  
Restricted Rotation

Two representatives of the three membered B2N-ring system have been obtained by dehalogenation of diborylamines Me3CN[BHalNR2]2. In solution there is no restricted rotation at the exocyclic BN bond, even at low temperature. In contrast, the X-ray structure analysis of the bis-tetramethylpiperidino derivative 10a reveals alternation of short and long BN bonds; one of the tetramethylpiperidino groups stands nearly coplanar with the B2N-ring system, the other, however, is almost perpendicular to the ring plane. The ring contains a short BB bond (1.612 Å).

ChemInform Abstract: Comparison of the NMR Coupling Paths in Leucodrin and Conocarpin by Low-Temperature X-Ray Structure Analysis.

ChemInform ◽  
2010 ◽  
Vol 22 (32) ◽  
pp. no-no
Author(s):  
D. G. BILLING ◽  
J. C. A. BOEYENS ◽  
L. CARLTON ◽  
D. C. LEVENDIS ◽  
G. W. PEROLD
Keyword(s):  
Low Temperature ◽  
Structure Analysis ◽  
X Ray

ChemInform Abstract: LOW-TEMPERATURE X-RAY STRUCTURE ANALYSIS OF 1-BENZOTHIEPIN

1976 ◽  
Vol 7 (30) ◽  
pp. no-no
Author(s):  
NORITAKE YASUOKA ◽  
YASUSHI KAI ◽  
NOBUTAMI KASAI ◽  
TOSHIO TATSUOKA ◽  
ICHIRO MURATA
Keyword(s):  
Low Temperature ◽  
Structure Analysis ◽  
X Ray

Synthesis And Crystal Structures Of The Polygermanide Ammoniates K4Ge9 · 9 NH3, Rb4Ge9 · 5 NH3 And Cs6Ge18 · 4 NH3

2005 ◽  
Vol 60 (3) ◽  
pp. 277-283 ◽  
Author(s):  
Christof Suchentrunk ◽  
Jörg Daniels ◽  
Mehmet Somer ◽  
Wilder Carrillo-Cabrera ◽  
Nikolaus Korber
Keyword(s):  
Low Temperature ◽  
Crystal Structures ◽  
Structure Analysis ◽  
Liquid Ammonia ◽  
Oxidizing Agent ◽  
X Ray ◽  
New Compounds

The new compounds K4Ge9 ·9 NH3 and Rb4Ge9 ·5 NH3 were prepared by the extraction of K4Ge9 and Rb4Ge9 with liquid ammonia and characterized by low temperature X-ray structure analysis. They both contain monocapped square antiprismatic Ge94− anions. Cs6Ge18 ·4 NH3 was prepared by the extraction of K2Cs2Ge9 with liquid ammonia in the presence of [(Bu)3MeN](Br2I) as an oxidizing agent, and contains a [Ge9-Ge9]6− dimer in which two Ge94− anions are linked by a single Ge-Ge bond

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