EXPERIMENTAL STUDIES OF SOLUTION PROCESSES: VI. EFFECT OF SOLVENT ON INFRARED ABSORPTION SPECTRA

1960 ◽  
Vol 38 (10) ◽  
pp. 1921-1926 ◽  
Author(s):  
P. A. D. De Maine ◽  
L. H. Daly ◽  
M. M. De Maine
Keyword(s):  
Infrared Absorption ◽  
Experimental Studies ◽  
Absorption Data ◽  
Frequency Shifts ◽  
Extinction Coefficients ◽  
Effect Of Solvent ◽  
Solution Processes ◽  
Pure Substances ◽  
Infrared Absorption Spectra ◽  
Molar Extinction Coefficients

Here are reported infrared absorption data between 4000 cm−1 and 700 cm−1 near 19 °C for methanol, n-propanol, isopropanol, cyclohexanol, benzyl alcohol, diethyl ether, anisole, 1,4-dioxane, diisopropyl ether, nitromethane, acetone, p-xylene, benzene, and hexane as pure substances and in carbon tetrachloride solution. Band frequencies accurate to within 1 cm−1 are reported. Except for the 3340 cm−1 band in dilute MeOH solutions no frequency shifts were observed even with gross changes of the electrical properties of the solutions. Molar extinction coefficients at absorption maxima are discussed briefly.

The Infrared Absorption Spectra of Some Samarium Diketo-ester Complexes

1970 ◽  
Vol 25 (2) ◽  
pp. 139-141 ◽  
Author(s):  
S. P. Tandon ◽  
P. C. Mehta
Keyword(s):  
Coordination Number ◽  
Absorption Spectra ◽  
Infrared Absorption ◽  
Relative Frequency ◽  
Methyl Acetoacetate ◽  
Frequency Shifts ◽  
Modes Of Vibration ◽  
Infrared Absorption Spectra ◽  
Stretching Vibrations ◽  
First Time

Infrared absorption spectra of some four- and five-coordinated (ethyl 1-methyl acetoacetate) complexes of trivalent samarium have been studied in the region 4000 - 250 cm-1 for the first time. About twenty bands in each chelate have been observed and assigned to different modes of vibration. A study of relative frequency shifts of CO stretching vibrations reveals that the metal-oxygen bonds in all the complexes are nearly of the same strength. The vibrational frequencies, with few exceptions, are found to be nearly independent of the coordination number of the metal.

3,5-Dialkyl Phenols and Their Allyl Substitution Products: Infrared Absorption Spectra and Interpretation of Characteristic Frequency Shifts

1970 ◽  
Vol 53 (2) ◽  
pp. 275-287
Author(s):  
J -Y T Chen ◽  
Nancy C Oates ◽  
David Firestone
Keyword(s):  
Absorption Spectra ◽  
Infrared Spectra ◽  
Infrared Absorption ◽  
Characteristic Frequency ◽  
Frequency Shifts ◽  
Mass Effects ◽  
Infrared Absorption Spectra ◽  
Absorption Frequencies ◽  
Allyl Substitution

Abstract The infrared spectra of five 3,5-dialkyl phenols, six 2-allyl-3,5-dialkyl phenols, and five 4-allyl-3,5-dialkyl phenols are presented. The characteristic infrared absorption frequencies are tabulated in correlation charts. The hyperconjugation and mass effects of substituent groups are discussed.

The Infrared Absorption Spectra of Some Samarium Chelates

1970 ◽  
Vol 25 (5) ◽  
pp. 472-475 ◽  
Author(s):  
S. P. Tandon ◽  
P. C. Mehta ◽  
R. N. Kapoor ◽  
S. N. Misra
Keyword(s):  
Absorption Spectra ◽  
Infrared Absorption ◽  
Relative Frequency ◽  
Vibration Modes ◽  
Frequency Shifts ◽  
Infrared Absorption Spectra

The infrared absorption of samarium (di-isopropoxy) mono dibenzoylmethide [Sm (ΟΡri) 2DBM] and samarium tris dibenzoylmethide [Sm(DBM)3] in the region 4000 - 250 cm-1 have been studied. About 25 bands in each chelate have been observed and assigned to different modes of vibrations. The number of metal-oxygen vibration modes of the chelates suggest Vh and D3 sym. metries for Sm (OPri) 2DBM and Sm (DBM) 3 respectively. The relative frequency shifts of CO and CC stretching modes indicate that the metal-oxygen bonding in Sm(DBM)3 is relatively stronger than in Sm (OPri) 2DBM.

Cyanide complex of 1,3,5-trinitrobenzene in nonaqueous solvents

1967 ◽  
Vol 45 (22) ◽  
pp. 2703-2709 ◽  
Author(s):  
A. R. Norris
Keyword(s):  
Charge Transfer Complex ◽  
Equilibrium Constants ◽  
Order Rate Constant ◽  
Nonaqueous Solvents ◽  
Cyanide Ion ◽  
Absorption Data ◽  
Extinction Coefficients ◽  
Type Complex ◽  
A Charge ◽  
Molar Extinction Coefficients

The initial reversible interaction of 1,3,5-trinitrobenzene and cyanide ion has been studied spectrophotometrically in a number of nonaqueous solvents and found to result in the formation of a complex containing 1,3,5-trinitrobenzene and cyanide ion in a 1:1 ratio. At 25.3 °C, the equilibrium constants for complex formation (K) and the molar extinction coefficients (ϵ) of the complex were found to be 1.44 ± 0.15 × 105 l mole−1 and 2.24 ± 0.05 × 104 l mole−1 cm−1 and 3.35 ± 0.35 × 105 l mole−1 and 2.24 ± 0.05 × 104 1 mole−1 cm−1 respectively for acetone and chloroform solutions. The second-order rate constant governing formation of the complex in chloroform was found to be 2.25 × 102 l mole−1 s−1 at 25.0 °C. On the basis of the visible and infrared absorption data obtained for the complex in chloroform and 1,2-dimethoxy-ethane, the complex is considered to be a Meisenheimer-type complex rather than a "charge-transfer" complex.

PHYSICAL PROPERTIES OF COMMERCIAL BILIRUBINS

1964 ◽  
Vol 42 (12) ◽  
pp. 1697-1702 ◽  
Author(s):  
Brian T. Newbold ◽  
Sister Gilberte LeBlanc
Keyword(s):  
Melting Point ◽  
Moisture Content ◽  
Physical Properties ◽  
Absorption Spectra ◽  
Infrared Absorption ◽  
Extinction Coefficients ◽  
Infrared Absorption Spectra

Some physical properties, such as color, melting point, moisture content, loss in weight on heating, solubility, and extinction coefficients, of five commercially available bilirubins have been determined and compared. The visible and infrared absorption spectra of the bilirubins also were recorded and are discussed.

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