Predicting Solid-State Heats of Formation of Newly Synthesized Polynitrogen Materials by Using Quantum Mechanical Calculations

2008 ◽  
Vol 112 (46) ◽  
pp. 11914-11920 ◽  
Author(s):  
H. Abou-Rachid ◽  
Y. Song ◽  
A. Hu ◽  
S. Dudiy ◽  
S. V. Zybin ◽  
...  
Keyword(s):  
Solid State ◽  
Heats Of Formation ◽  
Quantum Mechanical ◽  
Quantum Mechanical Calculations

Absolute structural elucidation of natural products-A focus on quantum-mechanical calculations of solid-state CD spectra

Chirality ◽  
2009 ◽  
Vol 21 (1E) ◽  
pp. E181-E201 ◽  
Author(s):  
Gennaro Pescitelli ◽  
Tibor Kurtán ◽  
Ulrich Flörke ◽  
Karsten Krohn
Keyword(s):  
Natural Products ◽  
Solid State ◽  
Structural Elucidation ◽  
Quantum Mechanical ◽  
Quantum Mechanical Calculations ◽  
Cd Spectra

Crystal Forms of Semisynthetic Ergot Alkaloid Terguride

2002 ◽  
Vol 67 (4) ◽  
pp. 479-489 ◽  
Author(s):  
Michal Hušák ◽  
Bohumil Kratochvíl ◽  
Ivana Císařová ◽  
Ladislav Cvak ◽  
Alexandr Jegorov ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Ergot Alkaloid ◽  
Simplified Model ◽  
Quantum Mechanical ◽  
Quantum Mechanical Calculations ◽  
X Ray Diffraction ◽  
Torsion Angles ◽  
Crystal Forms ◽  
X Ray ◽  
Independent Molecules

Two new structures of semisynthetic ergot alkaloid terguride created by unusual number of symmetry-independent molecules were determined by X-ray diffraction methods at 150 K. Form A (monoclinic, P212121, Z = 12) contains three symmetry-independent terguride molecules and two molecules of water in the asymmetric part of the unit cell. The form CA (monoclinic, P21, Z = 8) is an anhydrate remarkable by the presence of four symmetry-independent molecules in the crystal structure. Conformations of twelve symmetry-independent molecules that were found in four already described terguride structures are compared with torsion angles obtained by ab initio quantum-mechanical calculations for the simplified model of N-cyclohexyl-N'-diethylurea.

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