Amine inversion effects on the IR spectra of aniline in the gas phase and cold inert gas matrixes

Mukherjee, Moitrayee; Bandyopadhyay, Biman; Biswas, Partha; Chakraborty, Tapas

doi:10.1007/s12648-012-0037-y

Cited by 15 publications

(17 citation statements)

References 24 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It is interesting to compare this typical vibration of grafteda minopropyl groupsw ith that of amino groupsi nt he gas phase, that is, without hydrogen-bonding interaction. [75] It is well knownt hat the bending modes of AÀHg roups (A = O, N, etc.) [75] It is well knownt hat the bending modes of AÀHg roups (A = O, N, etc.)…”

Section: Ir Spectroscopymentioning

confidence: 99%

“…For instance, the gas-phase spectrum of methylamine shows a d(NH 2 )b and at 1620 cm À1 , [74] and the same positionw as reportedf or aniline, for which the presence of two components was proposed. [75] It is well knownt hat the bending modes of AÀHg roups (A = O, N, etc.) are shifted to higher wavenumbers as ar esult of hydrogen bonding, atv ariance with the typical redshift of the correspondings tretching modes.…”

Section: Ir Spectroscopymentioning

confidence: 99%

See 1 more Smart Citation

Investigating the Interaction of Water Vapour with Aminopropyl Groups on the Surface of Mesoporous Silica Nanoparticles

et al. 2017

View full text Add to dashboard Cite

The interaction of water molecules with the surface of hybrid silica-based mesoporous materials is studied by Si, H and C solid-state NMR and IR spectroscopy, with the support of ab initio calculations. The surface of aminopropyl-grafted mesoporous silica nanoparticles is studied in the dehydrated state and upon interaction with controlled doses of water vapour. Former investigations described the interactions between aminopropyl and residual SiOH groups; the present study shows the presence of hydrogen-bonded species (SiOH to NH ) and weakly interacting "free" aminopropyl chains with restricted mobility, together with a small amount of protonated NH groups. The concentration of the last-named species increased upon interaction with water, and this indicates reversible and fast proton exchange from water molecules to a fraction of the amino groups. Herein, this is discussed and explained for the first time, by a combination of experimental and theoretical approaches.

show abstract

Section: Ir Spectroscopymentioning

confidence: 99%

Section: Ir Spectroscopymentioning

confidence: 99%

Investigating the Interaction of Water Vapour with Aminopropyl Groups on the Surface of Mesoporous Silica Nanoparticles

et al. 2017

View full text Add to dashboard Cite

show abstract

“…The release of CO 2 and CO are characterized by the presence of the bands in the FTIR spectra at 2356 cm −1 (νCOO), 668 cm −1 (δCOO), 2227-2037 cm −1 . The bands in 3045 cm − were assigned to the vibration modes of the groups present in aniline, N 2 O and NH 3 molecules [7,16,[22][23][24].…”

Section: Evolved Gas Analysis (Ega By Tg/dsc-ftir)mentioning

confidence: 99%

Thermal behavior in oxidative and pyrolysis conditions and characterization of some metal p-aminobenzoate compounds using TG–DTA, EGA and DSC-photovisual system

Teixeira

Nunes

Fernandes

et al. 2017

Journal of Analytical and Applied Pyrolysis

View full text Add to dashboard Cite

Synthesis, thermal and spectroscopic study of solid bivalent transition metal compounds of Mn(II), Co(II), Ni(II), Cu(II) and Zn(II) with p-aminobenzoate as ligand were performed. The thermal study was performed in oxidative and pyrolysis conditions, using the thermoanalytical techniques: Simultaneous thermogravimetry and differential thermal analysis (TG-DTA), differential scanning calorimetry (DSC), DSC-photovisual system and evolved gas analysis (EGA) by TG/DSC-FTIR. Infrared absorption spectroscopy (FTIR) and powder X-ray diffractometry (PXRD) were employing in the spectroscopic study. The general formula M(L) 2. nH 2 O has been established by TG-DTA, elemental analysis and complexometry with EDTA, where M represents Mn, Co, Ni, Cu and Zn, L is paminobenzoate and n = 0 (Mn, Co), 1 (Ni), 1.5 (Zn), 2 (Cu). In oxidative condition (dry air atmosphere), the thermal decomposition occurred in one, two or three steps, with formation of the respective oxides (Mn 3 O 4, CoO, NiO, CuO and ZnO). Under pyrolysis condition (N 2 atmosphere), the thermal decomposition occurred in three or four steps, with mass loss still being observed up to 1000°C. DSC-photovisual system curves provided information about of the dehydration and phase transformation processes, as well as their enthalpies. The EGA data allowed the identification of gaseous products evolved during pyrolysis and oxidative decomposition. The results of the FTIR and PXRD also provided information on the ligand's denticity and crystallinity of the compounds. 2. Experimental 2.1. Synthesis The p-aminobenzoic acid (H-pABA, C7H7NO2) with 99% purity was

show abstract

“…In both atmospheres, the FTIR spectrum obtained at 242 • C (Fig. 1c) showed bands at 2356 cm −1 ( COO ), 668 cm −1 (ı COO ), 3045 cm −1 ( C−Har ), 1622/1510 cm −1 ( C=Car ), 1273 cm −1 ( C−N amine ), 1173-1085 cm −1 (ı CCCar ), 875 cm −1 (ˇC −Har ) and 746 (ı CCN ) cm −1 , which were assigned to the vibration modes of CO 2 and aniline molecules, respectively [22]. As previously discussed, the acid lost mass mainly due to physical phenomena, thus the EGA results suggest that decarboxylation should have occurred in the gaseous state, probably in the heated transfer line (225 • C).…”

Section: H-pabamentioning

confidence: 99%

Thermal and spectroscopic study to investigate p-aminobenzoic acid, sodium p-aminobenzoate and its compounds with some lighter trivalent lanthanides

et al. 2016

View full text Add to dashboard Cite

The characterization, thermal stability and thermal decomposition of some lighter trivalent lanthanide p-aminobenzoates, Ln(C 7 H 6 NO 2) 3 •H 2 O (Ln = La, Ce, Pr, Nd, Sm), as well as the thermal behavior and spectroscopic study of p-aminobenzoic acid C 7 H 7 NO 2 and its sodium salt were investigated. The following methods were utilized: simultaneous thermogravimetry and differential thermal analysis (TG-DTA) in dynamic dry air and nitrogen atmospheres; differential scanning calorimetry (DSC); middle (MIR) and near (NIR) infrared region spectroscopy; evolved gas analysis (EGA); elemental analysis; complexometry; X-ray diffraction (XRD); and diffuse reflectance spectroscopy (DR) in the ultraviolet and visible regions. All the compounds were obtained monohydrated and the thermal decomposition occurred in two, three or four steps in an air atmosphere, and three or four steps in N 2 atmosphere. In both atmospheres (air and N 2) the final residues were CeO 2 , Pr 6 O 11 , Ln 2 O 3 (Ln = La, Nd, Sm). The results also provided information concerning the coordination mode and thermal behavior, as well as the identification of the gaseous products which evolved during the thermal decomposition of these compounds. The DR and NIR spectra provided information about the ligand absorption bands and the f-f transitions of the Nd 3+ , Pr 3+ and Sm 3+ ions.

show abstract

Amine inversion effects on the IR spectra of aniline in the gas phase and cold inert gas matrixes

Cited by 15 publications

References 24 publications

Investigating the Interaction of Water Vapour with Aminopropyl Groups on the Surface of Mesoporous Silica Nanoparticles

Investigating the Interaction of Water Vapour with Aminopropyl Groups on the Surface of Mesoporous Silica Nanoparticles

Thermal behavior in oxidative and pyrolysis conditions and characterization of some metal p-aminobenzoate compounds using TG–DTA, EGA and DSC-photovisual system

Thermal and spectroscopic study to investigate p-aminobenzoic acid, sodium p-aminobenzoate and its compounds with some lighter trivalent lanthanides

Contact Info

Product

Resources

About