Infrared Spectra of 2,9-Dimethyl-1,10-phenanthroline, Its Hydrates and Acid Perchlorate

1962 ◽  
Vol 15 (3) ◽  
pp. 425 ◽  
Author(s):  
ECM Grigg ◽  
JR Hall ◽  
RA Plowman
Keyword(s):  
Infrared Spectra ◽  
Plane Motion ◽  
Ring System ◽  
Hydrogen Atoms ◽  
Absorption Bands ◽  
Out Of Plane ◽  
Intense Absorption ◽  
Infrared Absorption Spectra ◽  
Stretching Vibrations ◽  
Phase Out

Infrared absorption spectra of 2,9-dimethyl-1,10-phenanthroline (dmp), dmp 0.5H2O, dmp 2H2O, and dmp HClO4 have been obtained over the range 4000-650 cm-1. Bands between 1610 and 1545 cm-1 are attributed to stretching vibrations within the phenanthroline ring system. The in-phase out-of-plane motion of the ring hydrogen atoms is associated with intense absorption at 845 cm-1. A strong band is observed at 728 cm-1 which cannot be accounted for in terms of an out-of-plane CH deformation. The perchlorate is characterized by shifts of the strongest absorption bands observed in the spectra of dmp and the hydrates.

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.

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.

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.

The infra-red absorption bands associated with the COOH and COOD groups in dimeric carboxylic acids. I. The region from 1500 to 500 cm -1

1953 ◽  
Vol 216 (1125) ◽  
pp. 247-266 ◽  
Keyword(s):  
Carboxylic Acids ◽  
Raman Spectra ◽  
Crystalline Solid ◽  
Cooh Group ◽  
Absorption Bands ◽  
Solid States ◽  
Infra Red ◽  
Out Of Plane ◽  
Stretching Vibrations ◽  
Skeletal Deformation

The infra-red spectra of a considerable number of carboxylic acids and their COOD derivatives have been investigated between 1500 and 500 cm -1, as dimeric units in the liquid or crystalline solid states. Under these conditions the COOH group is shown usually to give rise to strong absorption bands in the regions 1420 ±20, 1300 ± 15 and 935 ± 15 cm -1 . The first two of these are found to correspond to closely coupled OH deformation and C—O stretching vibrations occurring in the plane of the (COOH) 2 dimeric ring; the latter is caused by the out-of-plane OH deformation vibration. COOD groups have absorption bands in the ranges 1350 ±50, 1050 ± 10 and 675 ±25 cm -1 , which can be assigned respectively to the C—O stretching mode and the in-plane and out-of-plane OD deformation vibrations. Less constant absorption bands of the COOH group between 700 and 575 cm -1 are attributed to O—C = O skeletal deformation vibrations, and the corresponding bands are found at slightly lower frequencies in the spectra of the COOD derivatives. The results of the infra-red investigation are compared with the Raman spectra of such acids and with related infra-red and Raman frequencies of other molecules. Infra-red spectra of some equimolecuiar mixtures of acids with water have also been studied.

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.

Infrared spectra and hydrogen bonding in some methyl α-glycopyranosides

1975 ◽  
Vol 28 (2) ◽  
pp. 335 ◽  
Author(s):  
AJ Michell
Keyword(s):  
Crystal Structure ◽  
Hydrogen Bonding ◽  
Infrared Spectra ◽  
Bending Vibrations ◽  
Ambient Temperatures ◽  
Out Of Plane ◽  
Stretching Vibrations ◽  
Plane Bending

Spectra in the OH stretching and out-of-plane bending regions of four methyl α-glycopyranosides of known crystal structure have been obtained at ambient and sub-ambient temperatures. Partial deuteration has been used to uncouple the stretching vibrations and assist in assignments of the out-of-plane bending vibrations.

Complexes of alkyl and aryl cyanides. Part VI. The vibrational spectra of MX2•2RCN, where M = Pd or Pt, X = Cl or Br, and R = Me or Ph, and the assignment of the metal–nitrogen stretching frequency

1968 ◽  
Vol 46 (14) ◽  
pp. 2347-2352 ◽  
Author(s):  
R. A. Walton
Keyword(s):  
Infrared Spectra ◽  
Vibrational Spectra ◽  
Metal Halide ◽  
Careful Examination ◽  
Absorption Bands ◽  
Intense Absorption ◽  
Nitrogen Bonds ◽  
Cis And Trans ◽  
First Time

A careful examination of the Raman and infrared spectra of the crystalline planar complexes cis-and trans-MX2•2RCN, where M = Pd or Pt, X = Cl or Br, and R = Me or Ph, reveals intense absorption bands in the 125–80 cm−1 region which can be assigned to modes involving stretching of the metal–nitrogen bonds. Alternative assignments for v(M—N) are also discussed. These results are compared with those for other metal halide – RCN systems. The complexes trans-PtBr2•2RCN are described for the first time.

Infrared spectra of compounds with the methoxymethyl protecting group

1986 ◽  
Vol 51 (1) ◽  
pp. 90-100 ◽  
Author(s):  
Soňa Vašíčková ◽  
Vladimír Pouzar ◽  
Ivan Černý ◽  
Pavel Drašar ◽  
Miroslav Havel
Keyword(s):  
Infrared Spectra ◽  
Strong Absorption ◽  
Protecting Group ◽  
Absorption Bands ◽  
Stretching Vibrations

Infrared spectra of a series of compounds containing the CH3OCH2O- (MOM-O-) group have been studied. All the spectra exhibit three characteristic strong absorption bands due to coupled stretching vibrations of C-O-C-O-C grouping in the region 1 200 - 1 000 cm-1.

Studies on hydrogen–oxygen systems in the electrical discharge. II. The reactions of hydrogen atoms with liquid ozone

1968 ◽  
Vol 46 (16) ◽  
pp. 2649-2653 ◽  
Author(s):  
Kazimiera Herman ◽  
Paul A. Giguère
Keyword(s):  
Hydrogen Peroxide ◽  
Infrared Spectra ◽  
Electrical Discharge ◽  
Hydrogen Gas ◽  
The Other ◽  
Hydrogen Atoms ◽  
Absorption Bands ◽  
Electrodeless Discharge ◽  
Primary Products ◽  
Extreme Care

We have reinvestigated in detail the infrared spectra between 4000 and 600 cm−1 of the solid products formed by reacting liquid ozone at −190 °C with a stream of hydrogen gas dissociated in an electrodeless discharge. Extreme care was exercised to get "clean" spectra, free from any contaminants. All the spectra thus obtained showed very clearly the characteristic absorption bands of H2O2 at 2840 and 1430 cm−1, and the much weaker one at 880 cm−1; with deuterium atoms the former bands were shifted to 2100 and 1080 cm−1 respectively. Thus previous contentions that hydrogen peroxide is not one of the primary products of that reaction are disproved. The other infrared bands of H2O2 were not conspicuous, due either to their diffuse nature in the vitreous spectra or to extensive overlapping by the strong absorption of H2O, the other major component. Warming the material up to −110 °C caused some devitrification, but no significant change in the spectra. No new bands which could be assigned unambiguously to the hypothetical molecule H2O4 were observed.

Correlation of Mössbauer Quadrupole Splitting (ΔΕQ) and Infrared Cyanide Frequency Separation in Alkali Metal Ferricyanides

1975 ◽  
Vol 30 (1-2) ◽  
pp. 96-98 ◽  
Author(s):  
A. N. Garg
Keyword(s):  
Solid State ◽  
Alkali Metal ◽  
Quadrupole Splitting ◽  
Infrared Spectra ◽  
Room Temperature ◽  
Frequency Separation ◽  
Hydrogen Atoms ◽  
Stretching Vibrations ◽  
Hydrogen Bonded

Mössbauer and infrared spectra of the alkali metal ferricyanides M3I [Fe(CN)6] · nH2O, where MI = H, Li and Na were studied at room temperature. All the three compounds displayed a doublet with small quadrupole splitting (ΔΕQ). Infrared spectra of these compounds in solid state gave two frequencies for C=N stretching vibrations with their separation (Δv) in increasing order which was found to be linearly correlated with ΔE Q. A plausible explanation has been given in terms of the interaction of Li+ and Na+ cations with the CN- ligands of octahedrally symmetric ferricyanide anion [Fe(CN)6]3- similar to that of hydrogen atoms which are hydrogen bonded in H3Fe(CN)6.

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