Infrared spectra of sulphate ions trapped in rubidium and cesium selenate: harmonic frequencies and anharmonicity constants for antisymmetric SO4 stretching vibrations

1999 ◽  
Vol 482-483 ◽  
pp. 257-262 ◽  
Author(s):  
Ljupčo Pejov ◽  
Vladimir M. Petruševski
Keyword(s):  
Infrared Spectra ◽  
Harmonic Frequencies ◽  
Stretching Vibrations ◽  
Anharmonicity Constants

Application of a New Principle of Assignment to the Infrared Spectrum of 2-Chloroacrylonitrile

1971 ◽  
Vol 26 (9) ◽  
pp. 1499-1514
Author(s):  
F. Wlnther
Keyword(s):  
Infrared Spectrum ◽  
Infrared Spectra ◽  
Harmonic Frequencies ◽  
Vibrational Resonances ◽  
Anharmonicity Constants

Abstract The principle of phase independent anharmonicity constants has been applied to the assignment of the infrared spectra of gaseous and liquid 1-chloro-1-cyanoethylene. The transferability of the anharmonicity constants of 1,1-dichloroethylene and some other objective criteria have also been utilized. An attempt has been made to correct for vibrational resonances and to determine the harmonic frequencies of H2C:CCl(CN).

Synthesis, spectral and electrochemical study of coordination molecules Cu4OX6L4: 4-cyanopyridine Cu4OBrnCl(6−n)(4-CNpy)4 complexes

2010 ◽  
Vol 64 (3) ◽  
Author(s):  
Gregor Ondrejovič ◽  
Adela Kotočová ◽  
Marian Koman ◽  
Peter Segľa
Keyword(s):  
Cyclic Voltammetry ◽  
Infrared Spectra ◽  
Electronic Spectra ◽  
Pyridine Ring ◽  
Pyridine Complexes ◽  
Half Wave ◽  
Out Of Plane ◽  
Donor Acceptor ◽  
Back Bonding ◽  
Stretching Vibrations

AbstractNew 4-cyanopyridine halide and mixed-halide Cu4OBrnCl(6−n)(4-CNpy)4 complexes (4-CNpy = 4-cyanopyridine, n = 0–6) were synthesised, characterised, and studied by infrared spectra, electronic spectra, and cyclic voltammetry. Infrared spectra revealed donor-acceptor vibrational couplings of the Cu4O, Cu-Cl, and Cu-N stretching vibrations with the in-plane and out-of-plane pyridine ring vibrations. The infrared spectra, electronic spectra, and half-wave potentials correspond to a weak donor and a strong acceptor behaviour of the 4-cyanopyridine ligands and to π-back bonding, Cu(II)→pyridine rings. The results were compared with the related pyridine and 4-substituted pyridine complexes.

The infrared spectra of theobromine salts

1967 ◽  
Vol 45 (23) ◽  
pp. 2899-2902 ◽  
Author(s):  
Denys Cook ◽  
Zephyr R. Regnier
Keyword(s):  
Hydrogen Bond ◽  
Nitrogen Atom ◽  
Infrared Spectra ◽  
Imidazole Ring ◽  
Free Base ◽  
Absorption Bands ◽  
Out Of Plane ◽  
Stretching Vibrations ◽  
Deformation Modes ◽  
Infrared Absorption Bands

From the infrared spectra of theobromine salts it is concluded that the salts are probably arranged in hydrogen-bonded centrosymmetric pairs involving [Formula: see text] interactions. [Formula: see text] anion− hydrogen bonds are formed by protonation of the free nitrogen atom (N9) in the imidazole ring. Infrared absorption bands arising from the former hydrogen bond constantly appear near 3 000 cm−1, whereas those from the latter shift from 2 580 to 3 300 cm−1, depending on the anion. In-plane NH and N+H deformation modes give bands near 1 485 and 1 160 cm−1, respectively. Out-of-plane NH modes have been located, but precise assignments are not possible.The assignments for some other bands which show deuteration shifts are detailed, and the carbonyl stretching vibrations which increase in frequency on protonation of the free base are identified.

Bestimmung der Kraftkonstanten der Hexafluoro-Komplexe des Technetium(IV) und Rhenium(IV) auf der Basis der D4h-Symmetrie

1970 ◽  
Vol 25 (2) ◽  
pp. 206-210 ◽  
Author(s):  
Wolfgang Krasser ◽  
Klaus Schwochau
Keyword(s):  
Force Field ◽  
Infrared Spectra ◽  
Force Constants ◽  
Irreducible Representations ◽  
Octahedral Complex ◽  
Site Symmetry ◽  
Complex Ions ◽  
Linear Combinations ◽  
Valence Force Field ◽  
Stretching Vibrations

Abstract The infrared spectra of potassium and cesium hexafluorotechnetate (IV) and -rhenate(IV) show a D4h-distortion of the octahedral complex ions. The splitting of degeneracies is not due to site symmetry. The linear combinations of the force constants of the irreducible representations A2u and Eu are determined in the valence force field on the basis of D4h-symmetry. As expected the force constants of stretching vibrations of [TcF6]-- are then smaller than those of [ReF6]--.

Effect of functional group conformation on the infrared spectra of some gem difunctional phenylethylene derivatives

1969 ◽  
Vol 47 (17) ◽  
pp. 3147-3152 ◽  
Author(s):  
D. J. Currie ◽  
C. E. Lough ◽  
F. K. McClusky ◽  
H. L. Holmes
Keyword(s):  
Absorption Band ◽  
Functional Groups ◽  
Infrared Spectra ◽  
Functional Group ◽  
Plane Deformation ◽  
Carbonyl Groups ◽  
Deformation Bands ◽  
Or Groups ◽  
Out Of Plane ◽  
Stretching Vibrations

Except for the benzalmalononitriles, two functional group stretching vibrations occur in the infrared (i.r.) spectra of the β,β-difunctional-styrenes with similar functional groups. For geometrically homogeneous compounds with dissimilar functional groups only one absorption band occurs for each functional group. The two bands for similar functional groups have been ascribed to S-cis- and S-trans-conformations of the carbonyl groups with respect to the ethylene and variation in the frequencies of each of these oriented carbonyls to rotation of the functional group or groups out of the plane of the ethylene by steric factors.Frequencies for ethylenic C—H out of plane deformation bands for β-monofunctional styrenes accorded with those already assigned to this vibration. A similar assignment could not be made for the difunctional analogues.

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