Crystal Structure of 1-3-7-9 Tetramethyluric Acid and the Molecular Packing in Hydroxymethyl Purine Crystals

Nature ◽  
1960 ◽  
Vol 188 (4744) ◽  
pp. 47-48 ◽  
Author(s):  
D. JUNE SUTOR
Keyword(s):  
Crystal Structure ◽  
Molecular Packing

scholarly journals Predicting the Crystal Structure of Decitabine by Powder NMR Crystallography: Influence of Long-Range Molecular Packing Symmetry on NMR Parameters

2016 ◽  
Vol 16 (12) ◽  
pp. 7102-7111 ◽  
Author(s):  
Jiri Brus ◽  
Jiri Czernek ◽  
Libor Kobera ◽  
Martina Urbanova ◽  
Sabina Abbrent ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Long Range ◽  
Molecular Packing ◽  
Nmr Parameters ◽  
Nmr Crystallography

Molecular packing in N-heterocycles: a predicted crystal structure for 1,4,5,8-tetraazanaphthalene

1971 ◽  
Vol 1 (6) ◽  
pp. 401-403 ◽  
Author(s):  
M. J. Robey ◽  
M. Sterns ◽  
H. M. Morris ◽  
I. G. Ross
Keyword(s):  
Crystal Structure ◽  
Molecular Packing

Crystal structure of 3-amino-5-acetyl-4,7-dihydro-6-methyl-4-(2-nitrophenyl)-2-cyanothieno[2,3-b]-pyridine and specific features of its molecular packing in crystal

2000 ◽  
Vol 45 (1) ◽  
pp. 91-97
Author(s):  
A. E. Lysov ◽  
V. N. Nesterov ◽  
K. A. Potekhin ◽  
Yu. T. Struchkov
Keyword(s):  
Crystal Structure ◽  
Molecular Packing

Crystal structure, molecular packing, FMO, NBO, nonlinear optical and optical limiting properties of an organic imidazolium diphenylacetate diphenylacetic acid single crystal

2018 ◽  
Vol 42 (4) ◽  
pp. 2439-2449 ◽  
Author(s):  
RO. MU. Jauhar ◽  
Paavai Era ◽  
V. Viswanathan ◽  
P. Vivek ◽  
G. Vinitha ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Single Crystal ◽  
Optical Activity ◽  
Structural Characterization ◽  
Nonlinear Optical ◽  
Optical Limiting ◽  
Molecular Packing ◽  
Optical Material ◽  
Nonlinear Optical Material ◽  
Diphenylacetic Acid

A new organic nonlinear optical material, imidazolium diphenylacetate diphenylacetic acid, with excellent structural characterization and nonlinear optical activity has been reported.

Crystal Structure and Molecular Packing Behavior of Poly(2,3-diphenyl-1,4-phenylenevinylene) Derivatives Containing Alkyl Side-Chains

2012 ◽  
Vol 46 (1) ◽  
pp. 155-163 ◽  
Author(s):  
Xiang-Kui Ren ◽  
Yu-Chun Wu ◽  
Shao-Jie Wang ◽  
Shi-Dong Jiang ◽  
Jun-Feng Zheng ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Molecular Packing ◽  
Side Chains ◽  
Alkyl Side Chains

Structure Analysis of a Rodlike Macromolecule: Poly(2,2'-(p,p'-Biphenyl)−6,6'-bis(4-Phenylquinoline))

1988 ◽  
Vol 134 ◽  
Author(s):  
Craig W. Burkhart ◽  
Jerome B. Lando ◽  
John K. Stille
Keyword(s):  
Crystal Structure ◽  
Structure Analysis ◽  
Molecular Packing ◽  
Unit Cell ◽  
X Ray Diffraction ◽  
X Ray ◽  
Fiber Diffraction ◽  
Herringbone Structure ◽  
Packing Analysis

ABSTRACTUniaxially oriented, crystalline fibers of poly(2,2'-(p,p'-biphenyl)- 6,6'-bis(4-phenylquinoline)) [PBPQ], were subjected to structure analysis via x-ray diffraction and molecular packing analysis. Packing analysis was required due to the sparse and diffuse nature of the fiber diffraction photographs. The combination of the two techniques allowed us to resolve the crystal structure. PBPQ packs in a syn conformation, in a modified herringbone structure. It has a unit cell of a = 16.2Å, b = 5.31Å, c = 21.4Å. There are two independent chains in the unit cell. An overview of the refinement of the crystal structure, the packing analysis and the crystallography are presented.

scholarly journals Crystal structure of 1,1,2,2-tetramethyl-1,2-bis(2,3,4,5-tetramethylcyclopenta-2,4-dien-1-yl)disilane

2015 ◽  
Vol 71 (11) ◽  
pp. o888-o888 ◽  
Author(s):  
Christian Godemann ◽  
Anke Spannenberg ◽  
Torsten Beweries
Keyword(s):  
Molecular Structure ◽  
Crystal Structure ◽  
Bond Length ◽  
Intermolecular Interactions ◽  
Torsion Angle ◽  
Title Compound ◽  
Molecular Packing ◽  
Steric Strain ◽  
Compound C ◽  
Supramolecular Chains

The molecular structure of the title compound, C22H38Si2, features atransarrangement of the cyclopentadienyl rings to avoid steric strain [C—Si—Si—C torsion angle = −179.0 (5)°]. The Si—Si bond length is 2.3444 (4) Å. The most notable intermolecular interactions in the molecular packing are C—H...π contacts that lead to the formation of wave-like supramolecular chains along thebaxis.

scholarly journals TheZ′ = 12 superstructure of Λ-cobalt(III) sepulchrate trinitrate governed by C—H...O hydrogen bonds

2016 ◽  
Vol 72 (3) ◽  
pp. 372-380 ◽  
Author(s):  
Somnath Dey ◽  
Andreas Schönleber ◽  
Swastik Mondal ◽  
Siriyara Jagannatha Prathapa ◽  
Sander van Smaalen ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Low Temperature ◽  
Hydrogen Bonds ◽  
Room Temperature ◽  
Structural Parameters ◽  
Molecular Packing ◽  
Nitrate Group ◽  
Structural Variations ◽  
Monoclinic Symmetry ◽  
Low Temperature Crystal Structure

Λ-Cobalt(III) sepulchrate trinitrate crystallizes inP6322 withZ= 2 (Z′ = 1/6) at room temperature. Slabs perpendicular to the hexagonal axis comprise molecules Co(sepulchrate) alternating with nitrate groupsAandB. Coordinated by six sepulchrate molecules, highly disordered nitrate groupsCare accommodated between the slabs. Here we report the fully ordered, low-temperature crystal structure of Co(sep)(NO3)3. It is found to be a high-Z′ structure withZ′ = 12 of the 12-fold 6a_{h}\times\sqrt{3}b_{h}\times c_{h} superstructure with monoclinic symmetryP21(cunique). Correlations between structural parameters are effectively removed by refinements within the superspace approach. Superstructure formation is governed by a densification of the packing in conjunction with ordering of nitrate groupC, the latter assuming different orientations for each of theZ′ = 12 independent copies in the superstructure. The Co(sep) moiety exhibits small structural variations over its 12 independent copies, while orientations of nitrate groupsAandBvary less than the orientations of the nitrate groupCdo. Molecular packing in the superstructure is found to be determined by short C—H...H—C contacts, with H...H distances of 2.2–2.3 Å, and by short C—H...O contacts, with H...O distances down to 2.2 Å. These contacts presumably represent weak C—H...O hydrogen bonds, but in any case they prevent further densification of the structure and strengthening of weak N—H...O hydrogen bonds with observed H...O distances of 2.4–2.6 Å.

Sign in / Sign up

Export Citation Format

Share Document