Infrared spectra of unannealed and of annealed Cu4(OH)6(NO3)2

1987 ◽  
Vol 65 (10) ◽  
pp. 2504-2508 ◽  
Author(s):  
Etalo A. Secco ◽  
Glen G. Worth
Keyword(s):  
Infrared Spectra ◽  
Group Analysis ◽  
Site Symmetry ◽  
Torsional Mode ◽  
Oh Groups ◽  
Distinct Individual ◽  
Striking Change ◽  
Bending Modes ◽  
Combination Bands ◽  
First Time

The infrared spectra over the range 4000–150 cm−1 of Cu4(OH)6(NO3)2 along with site group and factor group analysis are reported for the first time. The observed absorption frequencies associated with OH and NO3 modes show distinct individual spectral features in the unannealed and annealed Cu4(OH)6(NO3)2. Three distinct types of OH groups involving different degrees of H-bonding are evident. The multiple frequencies involving Cu—O—H bending modes further reflect the varying degrees of H-bonding and OH coupling in Cu(OH)4O2 and Cu(OH)5O entities paralleling their behavior in Cu4(OH)6SO4. The NO3 internal optic modes' activities, fundamentals along with overtones and combination bands, illustrate distinct interaction effects (OH and Cu) with respect to specific modes relative to halo-nitrates with same site symmetry. The presence of CuO in the sample after the anneal effected a striking change in ν3. The Cu—O, O—Cu—O, and OH torsional mode frequencies show consistent behavior with Cu4(OH)6SO4.

Spectroscopic properties of SO4 (and OH) in different molecular and crystalline environments. I. Infrared spectra of Cu4(OH)6SO4, Cu4(OH)4OSO4, and Cu3(OH)4SO4

1988 ◽  
Vol 66 (2) ◽  
pp. 329-336 ◽  
Author(s):  
Etalo A. Secco
Keyword(s):  
Infrared Spectra ◽  
Dipolar Coupling ◽  
Group Analysis ◽  
Spectroscopic Properties ◽  
Site Symmetry ◽  
Oh Groups ◽  
Distinct Individual ◽  
Multiple Frequencies ◽  
Bending Modes ◽  
First Time

The infrared spectra over the range 4000–50 cm−1 of three copper basic sulfates, viz. Cu4(OH)6SO4, Cu4(OH)4OSO4, Cu3(OH)4SO4 along with site group and factor group analysis for Cu4(OH)6SO4 are reported for the first time. The observed absorption frequencies associated with OH and SO4 activities show distinct individual structural features.Three distinct types of OH groups are present in Cu4(OH)6SO4 and Cu4(OH)4OSO4 but only two types are evident in Cu3(OH)4SO4. The two OH groups involved in the dehydroxylation reaction to give the oxycompound Cu4(OH)4OSO4 are tentatively identified. The multiple frequencies involving Cu—O—H bending modes further reflect the varying degrees of H-bonding and OH coupling in Cu(OH)4O2 and Cu(OH)5O entities.The SO4 internal optic modes' multiplet structure and frequencies in the basic sulfates illustrate the different extent of dipolar coupling effects (OH and Cu) with respect to specific modes relative to Li2SO4 with same site symmetry. The SO4 external optic modes relative to Li2SO4 are barely affected by neighboring OH groups.The Cu—O mode frequencies show parallel behavior with minor interaction effects in all compounds.

Vibration spectra of mixed crystals Sc(PO4, VO4) and Y(PO4, VO4)

1982 ◽  
Vol 47 (4) ◽  
pp. 1176-1183 ◽  
Author(s):  
Alexander Muck ◽  
Olga Smrčková ◽  
Bohumil Hájek
Keyword(s):  
Infrared Spectra ◽  
Group Analysis ◽  
Point Of View ◽  
Mixed Crystals ◽  
Site Symmetry ◽  
Lattice Vibrations ◽  
Vibration Spectra ◽  
Space Group

Infrared spectra of mixed crystals Sc(PO4, VO4) and Y(PO4, VO4) have been studied from the point of view of group analysis. These systems form substitution mixed crystals in tetragonal space group D194h. The anions having proper symmetry Td or D2d in site symmetry D2d exhibit in spectra lowering of the site symmetry to effective C2 as a result of lattice vibrations of the type T(B2).

Crystal symmetry of the chlorate anion in host structures

1985 ◽  
Vol 50 (5) ◽  
pp. 1147-1152 ◽  
Author(s):  
Bohumil Hájek ◽  
Alexander Muck ◽  
Olga Smrčková
Keyword(s):  
Infrared Spectra ◽  
Group Analysis ◽  
Crystal Symmetry ◽  
Site Symmetry ◽  
Host Structure

The infrared spectra were studied for the pyramidal ClO3- anion (C3v) embedded in host structures of various symmetries. Small amounts of NaClO3 or KClO3 were incorporated in NaBrO3 (T4), NaIO3 (D162h), KBrO3 (C3v5), and KIO3 (C11) structures. The ClO3- anion was found to assume the site symmetry of the host structure anion, i.e. C3, Cs, C3v, and C1, respectively, in accordance with the results of group analysis.

Infrared spectra of the NO3- anion in NaClO4, Na2SO4, NaClO3, and NaIO3 host structures

1987 ◽  
Vol 52 (12) ◽  
pp. 2886-2889 ◽  
Author(s):  
Bohumil Hájek ◽  
Alexander Muck ◽  
Olga Smrčková
Keyword(s):  
Infrared Spectra ◽  
Group Analysis ◽  
Crystal Symmetry ◽  
Site Symmetry ◽  
Additional Symmetry ◽  
Host Structure

The planar NO3- ion (own symmetry D3h) was embedded in NaClO4, Na2SO4, NaClO3 and NaIO3 host structures containing tetrahedral (Td) or pyramidal (C3v) anions, and its infrared spectra were interpreted in terms of group analysis of the crystal symmetry. Where the correlation is satisfied, viz. in NaClO4, NaClO3 and NaIO3, the NO3- anion possesses the site symmetry of the host structure (C2v, C3 and Cs, respectively), whereas in Na2SO4 an additional symmetry lowering takes place (D2 → C2).

Polarized overtone-combination bands in the near-infrared spectra of K2SnCl4•H2O and KSnCl3•H2O at cryogenic temperatures

1986 ◽  
Vol 64 (5) ◽  
pp. 1012-1019 ◽  
Author(s):  
Ian M. Walker ◽  
Paul J. McCarthy
Keyword(s):  
Water Molecule ◽  
Normal Mode ◽  
Infrared Spectra ◽  
Near Infrared ◽  
Water Molecules ◽  
Site Symmetry ◽  
Cryogenic Temperatures ◽  
Near Infrared Spectra ◽  
Combination Bands ◽  
Anharmonicity Constants

The near-infrared (nir) spectra of K2SnCl4•H2O and KSnCl3•H2O contain many highly polarized absorptions, due largely, if not completely, to combinations of vibrations of the water molecules in the crystals. The polarization of the absorptions can be related to the site symmetry of the water molecule. In K2SnCl4•H2O combination bands based on rocking, wagging, and twisting librations are seen, from which it is possible to definitively identify the rocking libration. The librations are much less in evidence in the spectra of KSnCl3•H2O. Sets of normal mode anharmonicity constants have been calculated from the energies of the absorptions.

Far Infrared Group Frequencies. V. Oximes and Aldoximes

1973 ◽  
Vol 27 (1) ◽  
pp. 22-26 ◽  
Author(s):  
S. M. Craven ◽  
F. F. Bentley ◽  
D. F. Pensenstadler
Keyword(s):  
Hydrogen Bond ◽  
Infrared Spectra ◽  
Low Frequency ◽  
Far Infrared ◽  
Torsional Vibrations ◽  
Lattice Vibrations ◽  
Dilute Solutions ◽  
Solid Samples ◽  
Bending Modes ◽  
Bond Stretch

The low frequency infrared spectra from 450 to 75 cm−1 of seven oximes and five aldoximes have been recorded for pure samples and for dilute solutions in cyclohexane. An intense characteristic band is present in the solution spectra at 367 ± 10 cm−1. This characteristic band shifts to 275 ± 10 cm−1 in the spectra of the OD compounds. The 367 ± 10 cm−1 and 275 ± 10 cm−1 bands are assigned to OH and OD torsional vibrations. A comparison of the solution spectra with spectra of the solid samples indicated that the OH … N hydrogen bond stretch of oximes and aldoximes occurs in 300 to 200 cm−1 region. Strong bands also are present in 140 to 100 cm−1 region which are due to OH … N bending modes or perhaps lattice vibrations.

Infrared spectra of the interactions of aniline and porous glass surfaces

1969 ◽  
Vol 47 (8) ◽  
pp. 1281-1287 ◽  
Author(s):  
M. J. D. Low ◽  
V. V. Subba Rao
Keyword(s):  
Nitrogen Atom ◽  
Aromatic Ring ◽  
Secondary Amine ◽  
Infrared Spectra ◽  
Porous Glass ◽  
Weak Interactions ◽  
Amine Group ◽  
Oh Groups ◽  
Glass Surfaces ◽  
Adsorption And Dissociation

Infrared spectra were recorded of aniline sorbed on highly dehydroxylated, deuterated, and on fluoridated porous glass as well as on pure and boria-impregnated silica. The results suggest that two types of weak interactions involving the surface SiOH and B—OH groups occurred; the nitrogen atom of the amine was hydrogen bonded to surface OH and there was an interaction between OH groups and the π system of the aromatic ring. Some aniline chemisorbed on surface boron via the nitrogen atom of the amine group. Some aniline chemisorbed dissociatively to form secondary amine structures bonded through the nitrogen to surface boron atoms and new B—OH groups formed. Surface boron impurity acted as an adsorption and dissociation center.

Spin dynamics and absorption-band profiles for the planar two-dimensional easy-plane ionic ferromagnet Rb 2 CrCl 4

1988 ◽  
Vol 415 (1849) ◽  
pp. 277-302 ◽  
Keyword(s):  
Magnetic Field ◽  
Spin Dynamics ◽  
Optical Data ◽  
Planar Anisotropy ◽  
Eigenvalues And Eigenfunctions ◽  
Experimental Conditions ◽  
Anisotropy Parameters ◽  
Combination Bands ◽  
First Time ◽  
Crystallographic Axes

Eigenvalues and eigenfunctions of the spin waves in Rb 2 CrCl 4 , in the absence or presence of a magnetic field oriented along (or slightly off) one of the major crystallographic axes, are given in detail for the first time. We present a simple model to simulate the profiles of exchange induced exciton-magnon combination bands in canted ferromagnets, under various experimental conditions of temperature and magnetic field. This model is used to analyse new high-resolution magneto-optical data at low and very low (0.35 K) temperatures and to derive precise anisotropy parameters. It can be applied with only slight modifications to metamagnets showing axial or planar anisotropy.

scholarly journals Integrated Band Intensities of Ethylene (C212H4) by Fourier Transform Infrared Spectroscopy

2012 ◽  
Vol 2012 ◽  
pp. 1-5 ◽  
Author(s):  
G. B. Lebron ◽  
T. L. Tan
Keyword(s):  
Fourier Transform ◽  
Infrared Spectroscopy ◽  
Ambient Temperature ◽  
Ftir Spectroscopy ◽  
Fourier Transform Infrared ◽  
Vapor Pressures ◽  
Infrared Band ◽  
Combination Bands ◽  
First Time ◽  
Absorbance Spectra

The integrated band intensities of ethylene (12C2H4) in the 640–3260 cm−1 region were determined by Fourier transform infrared (FTIR) spectroscopy. The infrared absorbance spectra of the ν7 and ν10, ν12, ν7+ν8, ν6+ν10, v11, and ν9 and ν2+ν12 bands of ethylene recorded at a resolution of 0.5 cm−1 were measured at an ambient temperature of 296 K at various vapor pressures ranging from 3×10−5 to 1×10−3 atm to obtain respective Beer-Lambert's law plots. The measured integrated band intensities in cm−1/cm atm were S(ν9andν2+ν12)=112.20±0.24, S(ν11)=55.35±0.14, S(ν12)=41.22±0.30, and S(ν7andν10)=328.66±16.55. In addition, the measured infrared band intensities of the ν7+ν8 and ν6+ν10 combination bands of ethylene are reported for the first time: S(ν7+ν8)=21.701±0.028 cm−1/cm atm and S(ν6+ν10)=2.568±0.025 cm−1/cm atm.

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