CO2 inclusion bands in i.r. spectra of KBr pellets

Keresztury, Gábor; Incze, Mária; Soti, Ferenc; Imre, L.

doi:10.1016/0584-8539(80)80181-4

Cited by 17 publications

(11 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Similar to the results reported by Neoh et al (2006), there was no bending mode at 667 cm -1 of CO 2 in the IR spectra of the CD complexes as this peak might fall into the fingerprint region (1500-500 cm -1 ) caused by encapsulation of CO 2 into α-CD cavities. Moreover, it was reported that the intensity of this peak decreased sharply due to increased pressure and limited space for CO 2 rotation when it was compressed into a KBr pellet (Keresztury et al, 1980). These findings were comparable to this results in which the bending mode at 667 cm -1 of CO 2 was not found in any spectra of the complexes.…”

Section: Ftir Spectroscopysupporting

confidence: 86%

“…This phenomenon, known as "red-shift", was caused by occupation of CO 2 in the cavity of α-CD under high pressure (Neoh et al, 2006). A "red-shift" phenomenon of this wavenumber was also reported for complexes of CO 2 with various solid matrices, such as p-tbutylcalix[4]arene (Graham et al, 2002) and in KBr pellet (Keresztury et al, 1980). Similar to the results reported by Neoh et al (2006), there was no bending mode at 667 cm -1 of CO 2 in the IR spectra of the CD complexes as this peak might fall into the fingerprint region (1500-500 cm -1 ) caused by encapsulation of CO 2 into α-CD cavities.…”

Section: Ftir Spectroscopymentioning

confidence: 75%

See 1 more Smart Citation

Encapsulation of CO2 into amorphous and crystalline α-cyclodextrin powders and the characterization of the complexes formed

Howes

Bhandari

2015

Food Chemistry

View full text Add to dashboard Cite

Carbon dioxide complexation was undertaken into solid matrices of amorphous and crystalline α-cyclodextrin (α-CD) powders, under various pressures (0.4-1.6 MPa) and time periods (4-96 h). The results show that the encapsulation capacity of crystalline α-CD was significantly lower than that of amorphous α-CD at low pressure and short time (0.4-0.8 MPa and 4-24 h), but was markedly enhanced with an increase of pressure and prolongation of encapsulation time. For each pressure level tested, the time required to reach a near equilibrium encapsulation capacity of the crystalline powder was around 48 h, which was much longer than that of the amorphous one, which only required about 8h. The inclusion complex formation of both types of α-CD powders was confirmed by the appearance of a CO2 peak on the FTIR and NMR spectra. Moreover, inclusion complexes were also characterized by DSC, TGA, SEM and X-ray analyses.

show abstract

Section: Ftir Spectroscopysupporting

confidence: 86%

Section: Ftir Spectroscopymentioning

confidence: 75%

Encapsulation of CO2 into amorphous and crystalline α-cyclodextrin powders and the characterization of the complexes formed

Howes

Bhandari

2015

Food Chemistry

View full text Add to dashboard Cite

show abstract

“…These bands can be attributed to carbon dioxide (R- and P-branches of the ν a (CO 2 ) band, respectively) trapped in the KBr pellet. 29 …”

Section: Resultsmentioning

confidence: 99%

Light-induced decarboxylation in a photo-responsive iron-containing complex based on polyoxometalate and oxalato ligands

et al. 2017

View full text Add to dashboard Cite

show abstract

“…The general predisposing factors for gallstones include genetic background, a sedentary lifestyle, a diet rich in simple sugars, diabetes mellitus, intolerance to glucose and decreased physical activity (37). Numerous independent risk factors, such as increased age, high body mass index, female gender, smoking habits, and use of hypolipidemic drugs, Brought to you by | Karolinska Institute Authenticated Download Date | 5/26/15 6:13 PM pregnancy, prolonged fasting, hepatobiliary infection are also positively associated with gallstone disease (30,38,39). However, the statistical significance of each of these factors is not consistent among different study groups.…”

Section: Discussionmentioning

confidence: 99%