Direct measurement of the distance between adjacent guest molecules in a disordered solid inclusion compound using solid-state 19F−1HNMR spectroscopy

1998 ◽  
Vol 289 (1-2) ◽  
pp. 25-29 ◽  
Author(s):  
Alison Nordon ◽  
Eric Hughes ◽  
Robin K Harris ◽  
Lily Yeo ◽  
Kenneth D.M Harris
Keyword(s):  
Solid State ◽  
Direct Measurement ◽  
Inclusion Compound ◽  
Solid Inclusion ◽  
Guest Molecules ◽  
1Hnmr Spectroscopy

scholarly journals Inclusion Compound of Efavirenz and γ-Cyclodextrin: Solid State Studies and Effect on Solubility

Molecules ◽  
2021 ◽  
Vol 26 (3) ◽  
pp. 519
Author(s):  
Susana Santos Braga ◽  
Firas El-Saleh ◽  
Karyna Lysenko ◽  
Filipe A. Almeida Paz
Keyword(s):  
Solid State ◽  
Inclusion Compound ◽  
Aqueous Solubility ◽  
Variation Method ◽  
Solid Inclusion ◽  
Antiretroviral Drug ◽  
Immunodeficiency Virus ◽  
Ft Ir ◽  
Cp Mas Nmr

Efavirenz is an antiretroviral drug of widespread use in the management of infections with human immunodeficiency virus type 1 (HIV-1). Efavirenz is also used in paediatrics, but due to its very poor aqueous solubility the liquid formulations available resort to oil-based excipients. In this report we describe the interaction of γ-cyclodextrin with efavirenz in solution and in the solid state. In aqueous solution, the preferential host–guest stoichiometry was determined by the continuous variation method using 1H NMR, which indicated a 3:2 host-to-guest proportion. Following, the solid inclusion compound was prepared at different stoichiometries by co-dissolution and freeze-drying. Solid-state characterisation of the products using FT-IR, 13C{1H} CP-MAS NMR, thermogravimetry, and X-ray powder diffraction has confirmed that the 3:2 stoichiometry is the adequate starting condition to isolate a solid inclusion compound in the pure form. The effect of γ-cyclodextrin on the solubility of efavirenz is studied by the isotherm method.

Bidirectional Transport of Guest Molecules through the Nanoporous Tunnel Structure of a Solid Inclusion Compound

2008 ◽  
Vol 113 (2) ◽  
pp. 736-743 ◽  
Author(s):  
Javier Martí-Rujas ◽  
Arnaud Desmedt ◽  
Kenneth D. M. Harris ◽  
François Guillaume
Keyword(s):  
Inclusion Compound ◽  
Solid Inclusion ◽  
Tunnel Structure ◽  
Guest Molecules ◽  
Bidirectional Transport

Tuning the configuration of the flexible metal–alkene-framework affords pure cycloisomers in solid state photodimerization

2021 ◽  
Author(s):  
Yong Wang ◽  
Meng-Fan Wang ◽  
David James Young ◽  
Hua Zhu ◽  
Fei-Long Hu ◽  
...  
Keyword(s):  
Solid State ◽  
Cycloaddition Reaction ◽  
Guest Molecules ◽  
Flexible Metal

The bulkiness of the guest molecules influences the conformations of the ligand and the final outcomes of the cycloaddition reaction.

Phase transitions involving re-ordering of the guest molecules in a solid organic inclusion compound: heptanoic anhydride–urea

1995 ◽  
pp. 2341-2342 ◽  
Author(s):  
Ian J. Shannon ◽  
Kenneth D. M. Harris ◽  
François Guillaume ◽  
Eduardo H. Bocanegra ◽  
Elizabeth J. MaClean
Keyword(s):  
Phase Transitions ◽  
Inclusion Compound ◽  
Guest Molecules ◽  
Organic Inclusion

Solid-state NMR studies of non-ionic surfactants confined in mesoporous silica

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Gerd Buntkowsky ◽  
Sonja Döller ◽  
Nadia Haro-Mares ◽  
Torsten Gutmann ◽  
Markus Hoffmann
Keyword(s):  
Solid State ◽  
Mesoporous Silica ◽  
Solid State Nmr ◽  
Role Models ◽  
Nmr Studies ◽  
Guest Molecules ◽  
Host Interactions ◽  
Functionalized Mesoporous Silica ◽  
Current Trends ◽  
Silica Materials

Abstract This review gives an overview of current trends in the investigation of confined molecules such as higher alcohols, ethylene glycol and polyethylene glycol as guest molecules in neat and functionalized mesoporous silica materials. All these molecules have both hydrophobic and hydrophilic parts. They are characteristic role-models for the investigation of confined surfactants. Their properties are studied by a combination of solid-state NMR and relaxometry with other physicochemical techniques and molecular dynamics techniques. It is shown that this combination delivers unique insights into the structure, arrangement, dynamical properties and the guest-host interactions inside the confinement.

scholarly journals Solid-state studies and antioxidant properties of the γ-cyclodextrin·fisetin inclusion compound

2017 ◽  
Vol 13 ◽  
pp. 2138-2145 ◽  
Author(s):  
Joana M Pais ◽  
Maria João Barroca ◽  
Maria Paula M Marques ◽  
Filipe A Almeida Paz ◽  
Susana S Braga
Keyword(s):  
Inclusion Compound ◽  
Antioxidant Properties ◽  
Physicochemical Analysis ◽  
Water Soluble ◽  
Solid Inclusion ◽  
Human Consumption ◽  
X Ray Diffraction ◽  
Wide Range ◽  
Soluble Solid ◽  
Cp Mas Nmr

Fisetin is a natural antioxidant with a wide range of nutraceutical properties, including antidiabetic, neuroprotecting, and suppression or prevention of tumors. The present work describes the preparation of a water-soluble, solid inclusion compound of fisetin with gamma-cyclodextrin (γ-CD), a cyclic oligosaccharide approved for human consumption. A detailed physicochemical analysis of the product is carried out using elemental analysis, powder X-ray diffraction (PXRD), Raman, infrared and 13C{1H} CP-MAS NMR spectroscopies, and thermal analysis (TGA) to verify fisetin inclusion and to present a hypothetical structural arrangement for the host–guest units. The antioxidant activity of the γ-CD·fisetin inclusion compound is evaluated by the DPPH assay.

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