Vibrational Spectra and Force Constants of Symmetric Tops, XLIII [1] Fourier Transform Infrared Spectra of Monoisotopic H3GeBr Species in the ν1/ν4 and ν6 Region

1984 ◽  
Vol 39 (9) ◽  
pp. 871-879 ◽  
Author(s):  
H. Bürger ◽  
R. Eujen ◽  
A. Rahner ◽  
P. Schulz ◽  
S. Cradock
Keyword(s):  
Fourier Transform ◽  
Excited State ◽  
Infrared Spectra ◽  
Vibrational Spectra ◽  
Ground State ◽  
Fourier Transform Infrared ◽  
Force Constants ◽  
Fourier Transform Infrared Spectra ◽  
Weakly Coupled

Fourier transform infrared spectra of the monoisotopic species H374Ge79Br and H374Ge81Br have been recorded in the ν1/ν4 region near 2100 cm-1 with a resolution of 0.015 cm-1 and in the ν6 and 2 ν6 regions near 580 and 1150 cm-1 with a resolution of 0.04 cm-1. Rotational analyses based on ~ 1500, ~1100 and ~ 300 data of ν1/ν4, ν6 and 2 ν6 respectively for each isotopomer have been performed, and ground state and excited state vibrational, rotational and rovibrational parameters have been determined, ν1, 2115.815 0(2)/2115.813 4(2) cm-1, and ν4, 2126.016 5(1) 2126.016 7(1) cm-1 (H374Ge79Br/H374Ge81Br), are weakly coupled by Coriolis x, y resonance, ζ1,4 ≃ - 0.021. ν6, 577.601 2(4)/577.541 7(4) cm-1, and ν4 are affected by / (±2, ±2) resonance. Furthermore, the hot bands (ν1+ν3)-ν3, (ν3+ν4)-ν3, (ν3+ν6)-ν3, 2ν6±2 - ν6±2 and 2ν06 - ν6±1 have been detected and analyzed.

Vibrational Spectra and Force Constants of Symmetric Tops, XLVII. Rovibrational Spectra of Three Monoisotopic H3GeCl Species in the υ6 Region

1985 ◽  
Vol 40 (4) ◽  
pp. 383-385 ◽  
Author(s):  
H. Bürger ◽  
P. Schulz ◽  
S. Cradock
Keyword(s):  
Fourier Transform ◽  
Excited State ◽  
Vibrational Spectra ◽  
Ground State ◽  
Force Constants ◽  
Rovibrational Spectra ◽  
Fourier Transform Spectra

Fourier transform spectra of the monoisotopic species H370Ge35Cl and H374Ge37Cl have been recorded in the υ6 region near 600 cm-1 with a resolution of 0.04 cm-1. Rotational analyses based on ∼ 700 data for each isotopomer have been performed, and the excited state parameters υ60, A6, B6, Aζ6, η6J, η6K, D6k and F6 have been determined. The previously reported analysis of υ6 data of H374Ge35Cl has been repeated employing improved ground state constants, and a r.m.s. deviation of ~ 4 x 10-3 cm-1 has been achieved for the three different isotopic combinations, which show fully consistent excited state parameters.

Synthesis, characterization, and their some chemical and biological properties of PVA/PAA/nPS hydrogel nanocomposites: Hydrogel and wound dressing

2020 ◽  
Vol 35 (3) ◽  
pp. 203-215
Author(s):  
Mehmet Emin Diken ◽  
Berna Koçer Kizilduman ◽  
Begümhan Yilmaz Kardaş ◽  
Enes Emre Doğan ◽  
Mehmet Doğan ◽  
...  
Keyword(s):  
Fourier Transform ◽  
Acrylic Acid ◽  
Infrared Spectra ◽  
Vinyl Alcohol ◽  
Fourier Transform Infrared ◽  
Poly Vinyl Alcohol ◽  
Seed Particles ◽  
Fourier Transform Infrared Spectra ◽  
Hydrogel Nanocomposites ◽  
Poly Acrylic Acid

The nanocomposite hydrogels were prepared by dispersing of the nanopomegranate seed particles into poly(vinyl alcohol)/poly(acrylic acid) blend matrix in an aqueous medium by the solvent casting method. These hydrogels were characterized using scanning electron microscopy, Fourier transform infrared spectra, differential scanning calorimetry, and optical contact angle instruments. The nanopomegranate seed, blend, and hydrogel nanocomposites were tested for microbial activity. In addition, cytocompatibilities of these blend and hydrogel nanocomposites/composites were tested on human lymphocyte with in vitro MTS cell viability assays. Fourier transform infrared spectra revealed that esterification reaction took place among functional groups in the structure of poly(vinyl alcohol) and poly(acrylic acid). The hydrophilic properties of all hydrogels decreased with increasing nanopomegranate seed content. The mean diameters of the nanopomegranate seed particles were about 88 nm. Nanopomegranate seed particles demonstrated antibacterial properties against gram-positive bacteria, Staphylococcus aureus, and gram-negative bacteria, Escherichia coli. The lymphocyte viabilities increased after addition of nanopomegranate seeds into the polymer blend. The swelling behavior of blend and hydrogels was dependent on the cross-linking density created by the reaction between poly(vinyl alcohol)/poly(acrylic acid) blend and nanopomegranate seed. Scanning electron microscopy images were highly consistent with Fourier transform infrared spectra, differential scanning calorimetry, and antibacterial activity results.

Band Shape Analysis of Fourier Transform Infrared Spectra

1982 ◽  
Vol 36 (4) ◽  
pp. 401-404 ◽  
Author(s):  
P. C. Gillette ◽  
J. B. Lando ◽  
J. L. Koenig
Keyword(s):  
Fourier Transform ◽  
Shape Analysis ◽  
Infrared Spectra ◽  
Goodness Of Fit ◽  
Nonlinear Least Squares ◽  
Fourier Transform Infrared ◽  
Quantitative Information ◽  
Band Shape ◽  
Fourier Transform Infrared Spectra ◽  
Overlapping Peaks

The application of a finite difference Levenberg-Marquardt nonlinear least-squares procedure for the resoluton of overlapping peaks in Fourier transform-infrared spectra is described. Starting estimates of peak parameters utilized in the refinement are obtained from a numerically approximated second derivative spectrum which has been smoothed. Quantitative information reflecting the constituent peaks and the “goodness of fit” is displayed graphically in a procedure requiring much less than 1 min to both initiate and obtain results in a form that is readily interpreted.

Gas Chromatographic/Matrix Isolation/Fourier Transform Infrared Spectra of the Laterally Chlorinated Dibenzo-p-Dioxins and Dibenzofurans

1989 ◽  
Vol 43 (8) ◽  
pp. 1317-1324 ◽  
Author(s):  
Charles J. Wurrey ◽  
Billy J. Fairless ◽  
Harry E. Kimball
Keyword(s):  
Fourier Transform ◽  
Infrared Spectra ◽  
Matrix Isolation ◽  
Fourier Transform Infrared ◽  
Fourier Transform Infrared Spectra ◽  
Reference Quality ◽  
Ft Ir ◽  
Chlorinated Dioxins ◽  
Chromatographic Matrix ◽  
Ft Ir Spectroscopy

Reference-quality gas chromatographic/matrix isolation/Fourier transform infrared spectra have been recorded for the following fifteen compounds, which collectively are referred to as the “laterally” chlorinated dibenzo- p-dioxins and dibenzofurans: 2,3,7,8-tetrachlorodibenzo- p-dioxin (2,3,7,8-TCDD); 1,2,3,7,8-pentachlorodibenzo- p-dioxin (1,2,3,7,8-PeCDD);l,2,3,4,7,8-hexachlorodibenzo- p-dioxin(1,2,3,4,7,8-HxCDD)>; 1,2,3,6,7,8,-hexachlorodibenzo- p-dioxin(1,2,3,6,7,8-HxCDD); 1,2,3,7,8,9-hexachlorodibenzo- p-dioxin (1,2,3,7,8,9-HxCDD); 1,2,3,4,6,7,8-heptachlorodibenzo- p-dioxin (1,2,3,4,6,7,8-HpCDD); 2,3,7,8-tetrachlorodibenzofuran (2,3,7,8-TCDF); 1,2,3,7,8-pentachlorodibenzofuran (1,2,3,7,8-PeCDF); 2,3,4,7,8-pentachlorodibenzofuran (2,3,4,7,8-PeCDF); 1,2,3,4,7,8-hexachlorodibenzofuran(1,2,3,4,7,8-HxCDF); 1,2,3,6,7,8-hexachlorodibenzofuran (1,2,3,6,7,8-HxCDF); 1,2,3,7,8,9-hexachlorodibenzofuran (1,2,3,7,8,9-HxCDF); 2,3,4,6,7,8-hexachlorodibenzofuran (2,3,4,6,7,8-HxCDF); 1,2,3,4,6,7,8-heptachlorodibenzofnran (1,2,3,4,6,7,8-HpCDF); and 1,2,3,4,7,8,9-heptachlorodibenzofuran (1,2,3,4,7,8,9-HpCDF). These spectra are discussed qualitatively and, for the laterally chlorinated dioxins, are compared to previously recorded gas-phase GC/FT-IR spectra. Estimates of the instrumental detection limits for these compounds, using matrix isolation GC/FT-IR spectroscopy, were found to fall in the mid-to-high picogram and low nanogram ranges.

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