Syntheses, Characterizations, and X-ray Single-Crystal Structures of 1,8-Bis(trimethylsilylamino)naphthalene Aluminum Hydride and the Methyl Derivative

2007 ◽  
Vol 2007 (31) ◽  
pp. 4919-4922 ◽  
Author(s):  
Zhi Yang ◽  
Xiaoli Ma ◽  
Herbert W. Roesky ◽  
Ying Yang ◽  
Víctor Manuel Jiménez-Pérez ◽  
...  
Keyword(s):  
Single Crystal ◽  
Crystal Structures ◽  
Aluminum Hydride ◽  
Methyl Derivative ◽  
X Ray ◽  
Single Crystal Structures

Coordination Chemistry of Diselenophosphinate Complexes:  The X-ray Single-Crystal Structures of [K(Se2PPh2)(THF)2]2and [In(Se2PPh2)3]·L (L = THF, PhMe)

2004 ◽  
Vol 43 (16) ◽  
pp. 4802-4804 ◽  
Author(s):  
Robert P. Davies ◽  
Claire V. Francis ◽  
Andrew P. S. Jurd ◽  
M. Giovanna Martinelli ◽  
Andrew J. P. White ◽  
...  
Keyword(s):  
Coordination Chemistry ◽  
Single Crystal ◽  
Crystal Structures ◽  
X Ray ◽  
Single Crystal Structures

Crystal-Structures of 2 3-Substituted 10,11-Dimethoxy-1,2,3,4,5,6-Hexahydro-7,9-etheno-3-benzazecine Derivatives

1989 ◽  
Vol 42 (2) ◽  
pp. 321
Author(s):  
XY Jia ◽  
JB Bremner ◽  
BW Skelton ◽  
AH White ◽  
KN Winzenberg
Keyword(s):  
Hydrogen Atom ◽  
Chemical Shift ◽  
Single Crystal ◽  
Crystal Structures ◽  
Naphthalene Ring ◽  
Methyl Derivative ◽  
X Ray ◽  
Structure Determinations

The title compounds are 3-aza[6](1,7)-naphthalenophanes with 3-Me and 3-CO2Me substituents, C18H23NO2 and C19H23NO4; in the former the chemical shift of the naphthalene hydrogen enclosed by the medium nitrogen-containing ring is the highest yet observed in a derivative of this type ( σ 9.33). In order to examine the environment of this hydrogen atom and the expected associated naphthalene ring distortions in both compounds, single-crystal X-ray structure determinations have been carried out at 295 K showing the transannular H…N distance in the methyl derivative to be remarkably short at 2.08(2) � . Crystals are triclinic, P1, a 11.683(3), b 10.846(3), c 6.729(2) �, α 90.08(2), β 93.33(2), γ 112.88 Z 2; R was 0.041 for 1378 'observed' reflections. Crystals of the 3-CO2Me derivative are also triclinic, P1, a 12.587(9), b 10.650(4), c 6.758(3) � , a 91.91(3), β 100.51(4), γ 104.74(5)° Z 2; R 0.067 for 1267 'observed' reflections.

scholarly journals Hydrogels formed from Fmoc amino acids

CrystEngComm ◽  
2015 ◽  
Vol 17 (42) ◽  
pp. 8047-8057 ◽  
Author(s):  
Emily R. Draper ◽  
Kyle L. Morris ◽  
Marc A. Little ◽  
Jaclyn Raeburn ◽  
Catherine Colquhoun ◽  
...  
Keyword(s):  
Amino Acids ◽  
Molecular Weight ◽  
Single Crystal ◽  
Crystal Structures ◽  
Diffraction Data ◽  
Low Molecular Weight ◽  
X Ray Diffraction ◽  
X Ray ◽  
Single Crystal Structures

A number of Fmoc amino acids can be effective low molecular weight hydrogelators; we compare single crystal structures to fibre X-ray diffraction data.

An explanation for the origin of hemihedrism in wulfenite: the single-crystal structures of I4̄1/a and I4̄ tungstenian wulfenites

2000 ◽  
Vol 64 (6) ◽  
pp. 1057-1062 ◽  
Author(s):  
D. E. Hibbs ◽  
C. M. Jury ◽  
P. Leverett ◽  
I. R. Plimer ◽  
P. A. Williams
Keyword(s):  
Single Crystal ◽  
Crystal Structures ◽  
San Francisco ◽  
Analytical Data ◽  
Site Occupancy ◽  
Unit Cell ◽  
Special Position ◽  
Space Group ◽  
X Ray ◽  
Single Crystal Structures

AbstractThe single-crystal X-ray structure of tungstenian wulfenite-I41/a containing 10 mol.% WO3 from the San Francisco mine, Sonora, Mexico, space group I41/a, a = 5.436(2), c = 12.068(8)Å and Z = 4, has been refined to R = 0.052. The Mo and W are disordered over special position 4a (0,0,0) in the lattice. Tungstenian wulfenite-I4̄ (‘chillagite’) from the Christmas Gift mine, Chillagoe, Queensland, Australia (Museum of Victoria specimen M16934), crystallizes in the closely related tetragonal space group I4̄, with a = 5.441(1), c = 12.068(6) Å and Z = 4. The structure was refined to R = 0.038. Refined site occupancy factors show that Mo and W are not distributed equally over the two crystallographically independent Mo/W positions, being 0.136(2) for Mo and 0.114(2) for W in special position 2a (0,0,0) and 0.184(2) for Mo and 0.066(2) for W in special position 2c (0,Ý,Ü). These give a composition corresponding to wulfenite64stolzite36, in agreement with analytical data. The Mo/W distributions in the unit cell provide one explanation for the origin of hemihedrism in the wulfenite-stolzite series.

Sign in / Sign up

Export Citation Format

Share Document