Spectra of sulphonyl derivatives. IV. Sulphonic esters

1957 ◽  
Vol 10 (3) ◽  
pp. 239 ◽  
Author(s):  
DE Freeman ◽  
AN Hamble
Keyword(s):  
Ester Group ◽  
Rotational Isomerism ◽  
Aromatic Esters ◽  
Methane Sulphonate ◽  
Bond Stretching ◽  
Stretching Vibration ◽  
Deformation Frequency

The symmetric and asymmetric SO2 stretching frequencies (1190, 1365 cm-1) and the SO2 deformation frequency (565 cm-1) in esters of arylsulphonic acids are similar to those for sulphonyl chlorides. A frequency of about 800 cm-1 can be correlated with the presence of the SO2.OR group and is probably the S-OR bond stretching vibration. The corresponding frequencies in methyl methane sulphonate are slightly lower. A doubling of some frequencies is attributed to the occurrence of rotational isomerism in the sulphonic ester group. The frequency noted by Ham and Hambly (1953b) and suggested as characteristic of aromatic sulphonyl derivatives corresponds to a very constant vibration 1098-1099 cm-1 in the aromatic esters studied.

Infrared Absorption Spectra of Vinyl Esters of Carboxylic Acids

1970 ◽  
Vol 24 (5) ◽  
pp. 495-498 ◽  
Author(s):  
George E. McManis
Keyword(s):  
Vinyl Ester ◽  
Ester Group ◽  
Vinyl Esters ◽  
Deformation Bands ◽  
Absorption Bands ◽  
Esters Of Carboxylic Acids ◽  
Sharp Band ◽  
Out Of Plane ◽  
Stretching Vibration ◽  
Infrared Absorption Spectra

The ir spectra of compounds containing the vinyl ester group exhibit absorption bands that allow them to be readily distinguished from other monosubstituted ethylenic compounds and from other esters. The vinyl C=C stretching vibration is a strong sharp band at 1640 cm−1, which is quite useful in analytical procedures. The C–H stretching vibrations of the vinyl ester group are observed as two weaker bands at 3117 and 3040 cm−1 flanking a larger sharp band at 3091 cm−1. In-plane C–H deformation bands are noted at 1413, 1291, and 1092 cm−1, while out-of-plane deformations are at 947, 868, and 603 cm−1. The stretching vibration of the ester carbonyl is a strong sharp band at 1754 cm−1. The C–O stretching region is dominated by a very strong band at 1142 cm−1.

Coupling of the Double Bond Stretching Vibration in Divinyl Ethers

1971 ◽  
Vol 4 (1-2) ◽  
pp. 15-17 ◽  
Author(s):  
Howard Kimmel ◽  
William H. Snyder
Keyword(s):  
Double Bond ◽  
Bond Stretching ◽  
Stretching Vibration

Evoking Photothermy by Capturing Intramolecular Bond Stretching Vibration-Induced Dark-State Energy

ACS Nano ◽  
2020 ◽  
Vol 14 (4) ◽  
pp. 4265-4275 ◽  
Author(s):  
Ming Chen ◽  
Xiaoyan Zhang ◽  
Junkai Liu ◽  
Feng Liu ◽  
Ruoyao Zhang ◽  
...  
Keyword(s):  
State Energy ◽  
Dark State ◽  
Bond Stretching ◽  
Stretching Vibration

Vibrational band intensities in substituted anilines

1957 ◽  
Vol 243 (1233) ◽  
pp. 143-153 ◽  
Keyword(s):  
Linear Relation ◽  
Vibrational Band ◽  
Vibration Band ◽  
Substituted Anilines ◽  
Absorption Bands ◽  
Bond Stretching ◽  
Infra Red ◽  
Analogous Data ◽  
Stretching Vibration ◽  
Stretching Vibrations

The infra-red absorption bands associated with the stretching vibrations of the NH 2 group in a series of meta - and para -substituted anilines have been examined. The effect of the sub­stituet groups upon the frequencies and intensities of the bands has been correlated with their Hammett σ factors. The widths of the bands have also been found to depend upon the position and nature of substituent. The linear relation between log (intensity) and σ suggested previously on the basis of other data has been found to hold in this case too. Measurements in several solvents have been compared, and surprising variations of band intensity have been found. Analogous data have been obtained for the N—H bond stretching vibration band in substituted N -methyl anilines. The effect of ortho substituents has also been examined in a few cases.

Spectroscopic Evidence for Near-Neighbor Bonded H(D) in A-Si:N:H(D) Thin Films

1996 ◽  
Vol 420 ◽  
Author(s):  
G. Lucovsky ◽  
P. Santos-Filho ◽  
A. Banerjee ◽  
Z. Jing
Keyword(s):  
Thin Films ◽  
Near Neighbor ◽  
Repulsive Interaction ◽  
Chemical Induction ◽  
Silicon Nitrides ◽  
Hydrogenated Silicon ◽  
Quantum Chemistry Calculations ◽  
Bond Stretching ◽  
Relative Separation ◽  
Stretching Vibration

AbstractIncreases in the frequency of the silicon monohydride (Si-H) bond-stretching vibration in hydrogenated silicon nitrides, over and above what can be attributed to chemical induction effects, are shown to be generated by a repulsive interaction between the H-atom of the Si-H group, and a near-neighbor SiN-H group. This interaction increases the effective bond-stretching force constant of the H-atom of the Si-H group. This effect has been verified by ab-initio quantum chemistry calculations that have been used to calculate the energy of the H-atom of the Si-H group as a function of the relative separation between near-neighbor Si-H and SiN-H groups. Decreases in the bond-stretching frequencies of SiN-H groups in heavily hydrogenated nitrides are attributed to H-bonding effects associated with near-neighbor pairs of SiN-H groups.

The effect of hydrogen bond strength on the frequency of a hydrogen bond stretching vibration

1968 ◽  
Vol 24 (2) ◽  
pp. 203-205 ◽  
Author(s):  
J.W. Brasch ◽  
R.J. Jakobsen ◽  
W.G. Fateley ◽  
N.T. McDevitt
Keyword(s):  
Hydrogen Bond ◽  
Bond Strength ◽  
Hydrogen Bond Strength ◽  
Bond Stretching ◽  
Stretching Vibration

Infrared spectra and the molecular conformations of some aliphatic amines

1970 ◽  
Vol 48 (20) ◽  
pp. 3229-3235 ◽  
Author(s):  
P. J. Krueger ◽  
J. Jan
Keyword(s):  
Infrared Spectra ◽  
Low Frequency ◽  
Lone Pair ◽  
Frequency Component ◽  
Rotational Isomerism ◽  
Kcal Mole ◽  
Stable Conformer ◽  
Molecular Conformations ◽  
Stretching Vibration ◽  
Bond Trans

The presence of two CD stretching bands for (CH3)2CDNH2 in dilute CCl4 solution is interpreted in terms of two conformations differing in enthalpy by 0.12 ± 0.02 kcal/mole. The low frequency component is assigned to the thermodynamically more stable conformer with the CD bond trans to the N lone pair. Similar rotational isomerism is observed in CH3CD2NH2 and CD3CH2NH2. Band contours for the NH stretching vibration in some N-alkyl anilines reported previously are also interpreted in terms of rotational isomerism and a change in hybridization of the N atom when the lone pair is trans to an α-CH bond, which results in an increase in vNH and a decrease in vCH.

scholarly journals Synthetic Characterization of Cellulose from Moringa oleifera seeds and Potential Application in Water Purification

2021 ◽  
Author(s):  
A. F. Afolabi ◽  
S. S. Oluyamo ◽  
I. A. Fuwape
Keyword(s):  
Water Purification ◽  
Moringa Oleifera ◽  
Crystallinity Index ◽  
Degree Of Crystallinity ◽  
X Ray Diffraction ◽  
Xrd Pattern ◽  
Bond Stretching ◽  
Stretching Vibration ◽  
High Degree

The use of Moringa oleifera seeds for purifying water has been attempted locally in various forms without putting scientific potency of the material into consideration. The cellulose sample isolated from Moringa {oleifera} seed was characterized using X-ray diffraction (XRD), scanning electron microscopy (SEM), and Fourier transform infrared spectroscopy (FTIR). The value of the crystallinity index (CIr ) from the XRD pattern is 63.1%. The high degree of crystallinity obtained is attributed to the high percentage of crystallinity index, CIr (i.e. 63.1%). The morphology revealed aggregates of conical and needle-like structure. The FTIR revealed O-H stretching, C-H stretching vibration, and C=O bond stretching functional groups. These characteristics are indicative of the potential of the material in water purification.

Synthesis and Thermal Property of Linear Chloromethylated Polystyrene

2010 ◽  
Vol 150-151 ◽  
pp. 1504-1507 ◽  
Author(s):  
Hong Chi Zhao ◽  
Juan Li Guo ◽  
Jiang Tao Li ◽  
Ling Ling Gao ◽  
Cong Cong Bian
Keyword(s):  
Gel Permeation Chromatography ◽  
Raw Material ◽  
Bending Vibration ◽  
Strong Absorption Band ◽  
Thermogravimetric Analyzer ◽  
Bond Stretching ◽  
Stretching Vibration ◽  
Infrared Spectrometer ◽  
Linear Poly ◽  
Aluminium Trichloride

Polystyrene (PS) was synthesized by emulsion polymerization. 1,4-bis(chloromethoxy)butane (BCMB) was synthesized using 1,4-butanediol, formaldehyde and phosphorus trichloride as raw material. The linear poly(p-chloromethyl styrene) (PS-Meyl-Cl) was prepared high effectively using BCMB and anhydrous aluminium trichloride as the chloromethylation reagent and catalyst, respectively. In this method, carcinogenic compound (chloromethyl ether etc.) was avoided. The resultant polymers were characterized by gel permeation chromatography (GPC), Fourier transform infrared spectrometer (FTIR) and thermogravimetric analyzer. The results show that the molecular weight (Mw) of PS is big. BCMB has been prepared because of the strong absorption band observed at 1130cm-1 (due to C-O-C bond stretching vibration) and two new bands at 640 and 1315cm-1 (due to the bending vibration of C-Cl bond and stretching vibration of C-H bond in -CH2Cl, respectively). Chloromethyl groups were introduced into benzene ring of PS because of the appearance of the absorption peaks at 676 and 1419cm-1 (due to the bending vibration of C-Cl bond and stretching vibration of C-H bond in -CH2Cl, respectively) in the FTIR spectra. The thermal stability of PS-Meyl-Cl was decreased with increasing chloromethyl group. Moreover, there are two decomposing stages. The reaction condition is gentle and the operation is safe, simple and economical.

Fir Hydrogen Bond Stretching Vibration as Function of Proton Transfer with Phenol-Pyridine Systems

1984 ◽  
Vol 17 (1) ◽  
pp. 41-46 ◽  
Author(s):  
Johannes Fritsch ◽  
Georg Zundel
Keyword(s):  
Hydrogen Bond ◽  
Proton Transfer ◽  
Bond Stretching ◽  
Stretching Vibration
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