Studies on metal hydroxy compounds. IV. Infrared spectra of cadmium derivatives Cd(OH)2, CdOHCl, and CdOHF

1967 ◽  
Vol 45 (24) ◽  
pp. 3199-3201 ◽  
Author(s):  
O. K. Srivastava ◽  
E. A. Secco
Keyword(s):  
Infrared Spectra ◽  
Strong Absorption ◽  
Lattice Vibrations ◽  
Absorption Bands ◽  
Simple Molecule ◽  
Stretching Vibration ◽  
Hydroxy Compounds ◽  
First Time ◽  
Lower Frequencies

Infrared spectra of hexagonal Cd(OH)2, CdOHCl, and CdOHF, along with deuterated analogues CdODCl and CdODF, in the range 2.5–16 μ are reported for the first time. The effects of substituting a halogen for an OH group in Cd(OH)2 are (i) shift of OH stretching vibration to a lower frequency and (ii) appearance of strong absorption bands in the region 8–16 μ. All the observed bands in the deuterated analogues are displaced to lower frequencies with νH/νd ratios between 1.35–1.37. The spectra of CdOHCl and CdOHF show a high correlation with their zinc analogues and although both spectra appear consistent with a simple molecule of Cs or C1 symmetry, an alternate interpretation is given in terms of OH lattice vibrations.

Studies on metal hydroxy compounds. II. Infrared spectra of zinc derivatives ϵ-Zn(OH)2, β-ZnOHCl, ZnOHF, Zn5(OH)8Cl2, and Zn5(OH)8Cl2·H2O

1967 ◽  
Vol 45 (6) ◽  
pp. 585-588 ◽  
Author(s):  
O. K. Srivastava ◽  
E. A. Secco
Keyword(s):  
Infrared Spectra ◽  
Group Factor ◽  
Absorption Bands ◽  
Site Group ◽  
Planar Molecule ◽  
Stretching Vibration ◽  
Hydroxy Compounds ◽  
A Site ◽  
First Time ◽  
Unambiguous Assignment

Infrared spectra of ϵ-Zn(OH)2, β-ZnOHCl, ZnOHF, Zn5(OH)8Cl2, and Zn5(OH)8Cl2·H2O and their deuterated analogues in the range 2.5–16 μ are reported for the first time. The effects of substituting a halogen for an OH group in Zn(OH)2 are (i) sharper OH stretching absorption bands, (ii) splitting of bands involving OH to give distinct doublets in ZnOHF and Zn5(OH)8Cl2, indicating strong intermolecular coupling, and (iii) shift of the OH stretching vibration to a higher frequency. Strong absorption bands are observed in the region of 695–780 cm−1 for all compounds and also near 1 020 ± 30 cm−1 in all cases except ZnOHCl. All the observed bands are displaced to lower frequencies by the deuterated analogues, with vH/vD ratios in the range 1.30–1.36. A cursory interpretation of the spectra of ZnOHCl and ZnOHF is given in terms of a planar molecule of Cs symmetry, but the unambiguous assignment of the bands must await a site group or group factor analysis.

Far infrared spectra of charge-transfer complexes between iodine and substituted pyridines

1967 ◽  
Vol 297 (1451) ◽  
pp. 440-448 ◽  
Keyword(s):  
Charge Transfer ◽  
Infrared Spectra ◽  
Equilibrium Constants ◽  
Far Infrared ◽  
Charge Transfer Complexes ◽  
Absorption Bands ◽  
Substituted Pyridines ◽  
Stretching Vibration ◽  
Far Infrared Spectra ◽  
Electronic And Steric Effects

Far infrared spectra of charge-transfer complexes between iodine and substituted pyridines, dissolved in cyclohexane, have been measured in the region 20 to 200 cm -1 . Bands have been assigned to the modified iodine molecule stretching vibration near 180 cm -1 , and to the stretching of the intermolecular bond in the range 65 to 95 cm -1 . The shifts of the vibration frequencies, and force constants calculated using a simple valency force field, have been discussed in relation to the mass, electronic and steric effects of substituent groups. Equilibrium constants for the formation of the complex have been determined. From the intensities of the absorption bands, further evidence has been found for a vibronic interaction, leading to a delocalization of the transition moment in the vibrations of the complexes, and to an enhancement of the intensity of absorption.

ORGANOGERMANIUM COMPOUNDS: PART II. INFRARED SPECTRA OF SOME ACOXYGERMANES AND THE RELATIVE INDUCTIVE EFFECTS OF TRIMETHYLSILYL AND TRIMETHYLGERMYL GROUPS

1963 ◽  
Vol 41 (5) ◽  
pp. 1244-1249 ◽  
Author(s):  
T. N. Srivastava ◽  
M. Onyszchuk
Keyword(s):  
Gas Phase ◽  
Infrared Spectra ◽  
Absorption Bands ◽  
Organogermanium Compounds ◽  
Inductive Effects ◽  
Electron Release ◽  
Carbonyl Absorption ◽  
Lower Frequencies

The infrared spectra of GeH3OCOCH3 and (CH3)3GeOCOCH3 have been measured in the gas phase over the range 650–3900 cm−1. Assignments for the principal bands have been made and their values compared with those of analogous alkyl, methylsilyl, methyltin, and methyllead acetates. Carbonyl absorption bands shift to lower frequencies and carbon–oxygen (skeletal) absorptions to higher frequencies as M changes from C to Si to Ge in the series of acetates represented by (CH3)3MOCOCH3. These results suggest that the Ge—O bond is more polar than the Si—O bond and that the order of electron release in acetate derivatives is (CH3)3Ge > (CH3)3Si > (CH3)3C, which is consistent with the electronegativity order: C > Si > Ge.

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.

Angular Dependence of Diffuse Reflectance Infrared Spectra. Part III: Linearity of Kubelka-Munk Plots

1988 ◽  
Vol 42 (2) ◽  
pp. 242-247 ◽  
Author(s):  
Paul J. Brimmer ◽  
Peter R. Griffiths
Keyword(s):  
Angular Dependence ◽  
Infrared Spectra ◽  
Diffuse Reflectance ◽  
Strong Absorption ◽  
Absorption Bands ◽  
Linear Region ◽  
Line Configuration ◽  
Munk Function ◽  
Before And After ◽  
Diffuse Reflectance Infrared

The linearity of plots of the Kubelka-Munk function against concentration is investigated for weak and strong absorption bands in the spectrum of a typical organic analyte, caffeine. The linear region is extended when measurements are made with an off-axis optical geometry, in comparison to an in-line configuration. For the latter configuration, the linearity is improved when crossed polarizers are placed before and after the sample.

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.

PROTONATED CARBONYL GROUPS: III. ANTIPYRINE SALTS

1963 ◽  
Vol 41 (11) ◽  
pp. 2794-2799 ◽  
Author(s):  
Denys Cook
Keyword(s):  
Hydrogen Atom ◽  
Hydrogen Bonds ◽  
Carbonyl Group ◽  
Infrared Spectra ◽  
Strong Absorption ◽  
Carbonyl Groups ◽  
Correlation Field ◽  
Bending Mode ◽  
Out Of Plane ◽  
Stretching Vibration

Salts of antipyrine (2,3-dimethyl-1-phenyl-5-pyrazolone) with halogen acids have been prepared and their infrared spectra from 4000 to 650 cm−1 recorded. Stoichiometrically they are normal 1:1 salts. Identification of bands due to vibrations of the protonating hydrogen atom has been aided by replacement with deuterium atoms. It is concluded that protonation occurs at the carbonyl group from the presence of a doublet (due to correlation field splitting) at 1320 and 1220 cm−1, attributed to the in-plane hydrogen-bending mode. The OH stretching vibration gives rise to bands between 2278 and 2720 cm−1 in the different salts. Out-of-plane hydrogen-bending mode absorptions are observed between 840 and 770 cm−1.More complex acids (HAsF6 etc.) give the anomalous 2 base:1 acid salts, characterized by strong absorption below 1400 cm−1, which probably contain strong, possibly symmetrical, hydrogen bonds.

INFRARED SPECTRA AND THE STRUCTURES OF XANTHATES AND DIXANTHOGENS

1961 ◽  
Vol 39 (8) ◽  
pp. 1633-1637 ◽  
Author(s):  
M. L. Shankaranarayana ◽  
C. C. Patel
Keyword(s):  
Metal Complexes ◽  
Infrared Spectra ◽  
Strong Absorption ◽  
Canonical Structure ◽  
Absorption Bands ◽  
Ionic Compounds ◽  
Structure Formula ◽  
Xanthic Acid

The infrared spectra of representative dialkyl dixanthogens and a few xanthates have been examined. All these compounds have two strong absorption bands in the regions 1140–1265 and 1010–1080 cm−1. On the basis of the shift of the bands with the changes in the substituents in the xanthic acid, the former band is assigned to the C=S group, while the latter to the CO group. Except in the ionic compounds, the canonical structure [Formula: see text] contributes very little to the structures of dixanthogens and covalent metal complexes.

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).

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.

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