Helical canal inclusion complexes formed by a bicyclic diol; X-ray crystal structure of exo-2, exo-6-dihydroxy-2,6-dimethylbicyclo[3.3.1]nonane–ethyl acetate inclusion complex

1979 ◽  
pp. 992-993 ◽  
Author(s):  
Roger Bishop ◽  
Ian Dance
Keyword(s):  
Crystal Structure ◽  
Inclusion Complex ◽  
Ethyl Acetate ◽  
Inclusion Complexes ◽  
X Ray

Crystal structure of an inclusion complex between chiral monoaza-15-crown-5 and S(–)-1-phenyl-ethyl ammonium percholorate

2003 ◽  
Vol 218 (5) ◽  
Author(s):  
Süheyla Özbey ◽  
F. B. Kaynak ◽  
M. Toğrul ◽  
N. Demirel ◽  
H. Hoşgören
Keyword(s):  
Crystal Structure ◽  
Inclusion Complex ◽  
Single Crystal ◽  
X Ray Diffraction ◽  
Space Group ◽  
X Ray ◽  
New Type

AbstractA new type of inclusion complex, S(–)-1 phenyl ethyl ammonium percholorate complex of R-(–)-2-ethyl - N - benzyl - 4, 7, 10, 13 - tetraoxa -1- azacyclopentadecane, has been prepared and studied by NMR, IR and single crystal X-ray diffraction techniques. The compound crystallizes in space group

Crystal Structure of a Novel Furo-Furan Lactone from Heliotropium eichwaldi

2012 ◽  
Vol 67 (3) ◽  
pp. 269-271
Author(s):  
Sadiqa Firdous ◽  
Nida Hassan Ansari ◽  
Seik Weng Ngb ◽  
Sammer Yousuf ◽  
Abdul Malik
Keyword(s):  
Crystal Structure ◽  
Ethyl Acetate ◽  
Soluble Fraction ◽  
X Ray Diffraction ◽  
X Ray ◽  
First Report ◽  
First Time

A novel furo-furan lactone 1 has been isolated as fine needles from the ethyl acetate-soluble fraction of Heliotropium eichwaldi. This is the first report of any furo-furan from the genus Heliotropium. β -Sitosterol 3-O-β -D-glucoside 2 has also been obtained for the first time from this source. The structure of 1 was elucidated by X-ray diffraction studies.

Synthesis and Characterization of a Dumbbell-Shaped Polyrotaxane Based on Polytetrahydrofuran bis(3-aminopropyl) Terminated and α-Cyclodextrins Using Polyamidoamine (PAMAM) Dentrimers as Bulky Stoppers

2015 ◽  
Vol 1094 ◽  
pp. 41-48
Author(s):  
Ri Min Cong ◽  
Huai Qing Yu ◽  
Yan Gong Yang ◽  
Si Yi Yang ◽  
Jiao Li ◽  
...  
Keyword(s):  
Thermogravimetric Analysis ◽  
Inclusion Complex ◽  
Inclusion Complexes ◽  
Synthesis And Characterization ◽  
Wide Angle ◽  
X Ray Diffraction ◽  
X Ray ◽  
H Nmr ◽  
Channel Type

A dumbbell-shaped polyrotaxane based on polytetrahydrofuran bis (3-aminopropyl) terminated and α-cyclodextrins using polyamidoamine (PAMAM) dentrimers as bulky stoppers was successfully prepared. The1H NMR results show that the peaks of α-CDs in these polyrotaxanes are broadened compared with pure α-CDs. Wide-angle X-ray diffraction (XRD) measurements of the resulting polyrotaxanes suggest to produce a channel-type crystalline structure of inclusion complex. Thermogravimetric analysis (TGA) of the resultant polyrotaxanes show that α-CDs are significantly stabilized by the formation of the inclusion complexes.

Novel Bisurea Host Compounds

2002 ◽  
Vol 2002 (11) ◽  
pp. 579-581
Author(s):  
Koichi Tanaka ◽  
Naoki Daikawa ◽  
Shigeru Ohba
Keyword(s):  
Crystal Structure ◽  
Inclusion Complex ◽  
High Selectivity ◽  
Crystal Structure Analysis ◽  
Intermolecular Hydrogen Bonds ◽  
New Host ◽  
Guest Molecules ◽  
X Ray ◽  
Host Molecules ◽  
Complex Crystals

New host molecules, 4,4′-bis(dimethylamino-urea)diphenylmethane (1) and its derivatives (2 and 3), are reported. These hosts are shown to give inclusion complex crystals with a wide variety of organic guest molecules with high selectivity. The crystal structure of 1:2 inclusion complex of 1 with THF has been determined from X-ray crystal structure analysis. The cyclic N–H...O intermolecular hydrogen bonds between host molecules were found to form columns for accommodation of the guest molecules.

The Preparation and Characterization of Inclusion Complex of Ursolic Acid with γ-Cyclodextrin

2011 ◽  
Vol 403-408 ◽  
pp. 712-716 ◽  
Author(s):  
Wei Zong ◽  
Su Mei Bi
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Inclusion Complex ◽  
Inclusion Complexes ◽  
Ursolic Acid ◽  
Scanning Calorimetry ◽  
X Ray ◽  
Grinding Method ◽  
Scanning Electron

In order to increase the solubility of ursolic acid, the inclusion complexes of ursolic acid with γ-cyclodextrin were prepared by grinding, ultrasonic and stirring methods. The characterizations of the inclusion complexes were proved by x-ray powder diffraction, fourier transform infrared spectroscopy, differential scanning calorimetry and scanning electron microscopy. The results confirmed the interactions of ursolic acid with γ-cyclodextrin, indicating the formation of the inclusion complexes. In addition, grinding method is a better way of preparing inclusion complex of ursolic acid with γ-cyclodextrin.

scholarly journals Preparation of Amylose-Oligo[(R)-3-hydroxybutyrate] Inclusion Complex by Vine-Twining Polymerization

Molecules ◽  
2021 ◽  
Vol 26 (9) ◽  
pp. 2595
Author(s):  
Jun-ichi Kadokawa ◽  
Yuki Wada ◽  
Kazuya Yamamoto
Keyword(s):  
Inclusion Complex ◽  
Inclusion Complexes ◽  
Water Soluble ◽  
Enzymatic Polymerization ◽  
X Ray Diffraction ◽  
Mechanism Of Formation ◽  
X Ray ◽  
Partial Formation ◽  
Glucan Phosphorylase ◽  
Polymerization Conditions

In this study, we attempted to prepare an amylose-oligo[(R)-3-hydroxybutyrate] (ORHB) inclusion complex using a vine-twining polymerization approach. Our previous studies indicated that glucan phosphorylase (GP)-catalyzed enzymatic polymerization in the presence of appropriate hydrophobic guest polymers produces the corresponding amylose–polymer inclusion complexes, a process named vine-twining polymerization. When vine-twining polymerization was conducted in the presence of ORHB under general enzymatic polymerization conditions (45 °C), the enzymatically produced amylose did not undergo complexation with ORHB. However, using a maltotriose primer in the same polymerization system at 70 °C for 48 h to obtain water-soluble amylose, called single amylose, followed by cooling the system over 7 h to 45 °C, successfully induced the formation of the inclusion complex. Furthermore, enzymatic polymerization initiated from a longer primer under the same conditions induced the partial formation of the inclusion complex. The structures of the different products were analyzed by X-ray diffraction, 1H-NMR, and IR measurements. The mechanism of formation of the inclusion complexes discussed in the study is proposed based on the additional experimental results.

scholarly journals Insights into molecular recognition from the crystal structures of p-tert-butylcalix[6]arene complexed with different solvents

IUCrJ ◽  
2021 ◽  
Vol 9 (1) ◽  
Author(s):  
Maura Malinska
Keyword(s):  
Molecular Recognition ◽  
Ethyl Acetate ◽  
Inclusion Complexes ◽  
Methyl Acetate ◽  
Crystal Packing ◽  
X Ray Diffraction ◽  
Polar Solvents ◽  
Guest Molecules ◽  
X Ray ◽  
Fill Percentage

Calixarenes are host molecules that can form complexes with one or more guest molecules, and molecular recognition in calixarenes can be affected by many factors. With a view to establishing molecular recognition rules, the host p-tert-butylcalix[6]arene (TBC6) was crystallized with different guest molecules (cyclohexane, anisole, heptane, toluene, benzene, methyl acetate, ethyl acetate, dichloromethane, tetrahydrofuran and pyridine) and the obtained structures were characterized by X-ray diffraction. With most solvents, 1:1 and/or 1:3 host–guest complexes were formed, although other stoichiometries were also observed with small guest molecules, and crystallization from ethyl acetate produced the unsolvated form. The calculated fill percentage of the TBC6 cavity was ∼55% for apolar guests and significantly lower for polar solvents, indicating that polar molecules can bind to apolar cavities with significantly lower packing coefficients. The most stable crystals were formed by 1:1 host–guest inclusion complexes. The ratio between the apolar surface area and the volume was used to predict the formation of inclusion versus exclusion complexes, with inclusion complexes observed at ratios <40. These findings allow the binding of potential guest molecules to be predicted and a suitable crystal packing for the designed properties to be obtained.

Sign in / Sign up

Export Citation Format

Share Document