Band Assignment of Anomalously Strong Absorption Band of 2,6-Diaminopyridine by Interaction with Acetic Acid

1992 ◽  
Vol 65 (6) ◽  
pp. 1685-1690 ◽  
Author(s):  
Kozo Inuzuka ◽  
Akira Fujimoto
Keyword(s):  
Acetic Acid ◽  
Absorption Band ◽  
Strong Absorption ◽  
Strong Absorption Band ◽  
Band Assignment

Expanding the strong absorption band by impedance matched mosquito-coil-like acoustic metamaterials

2020 ◽  
Vol 91 (2) ◽  
pp. 025102
Author(s):  
Mingming Hou ◽  
Junxiang Wu ◽  
Shaokun Yang ◽  
Jiu Hui Wu ◽  
Fuyin Ma
Keyword(s):  
Absorption Band ◽  
Strong Absorption ◽  
Acoustic Metamaterials ◽  
Mosquito Coil ◽  
Strong Absorption Band

scholarly journals Observation of precursorlike behavior of femtosecond pulses in a dye with a strong absorption band

2011 ◽  
Vol 83 (4) ◽  
Author(s):  
Matthew M. Springer ◽  
Wenlong Yang ◽  
Alexandre A. Kolomenski ◽  
Hans A. Schuessler ◽  
James Strohaber ◽  
...  
Keyword(s):  
Absorption Band ◽  
Strong Absorption ◽  
Femtosecond Pulses ◽  
Strong Absorption Band

Absorption of OH in the 1200 Å Region

1974 ◽  
Vol 52 (4) ◽  
pp. 318-323 ◽  
Author(s):  
A. E. Douglas
Keyword(s):  
High Resolution ◽  
Absorption Band ◽  
Rydberg State ◽  
Strong Absorption ◽  
Absorption Lines ◽  
Strong Absorption Band ◽  
Interstellar Absorption

A strong absorption band of OH has been observed near 1221 Å. From the analysis of high resolution spectra, it has been determined that the upper state is a 2Σ− Rydberg state and the constants of the OH and the corresponding OD state have been obtained. It is shown that the new absorption band will give interstellar absorption lines of OH at 1221.166, 1222.071, and 1222.524 Å. New constants have also been determined for the A2Σ+ and X2Π states of OD.

Determination of Strong Absorption Band Profiles of Low-Temperature Liquids from Reflection Spectra: The ν3 Band of Liquefied Tetrafluoromethane (CF4)

2015 ◽  
Vol 69 (4) ◽  
pp. 507-512 ◽  
Author(s):  
Pavel K. Sergeev ◽  
Dmitriy N. Shchepkin ◽  
Tatiana D. Kolomiitsova ◽  
Vladimir V. Bertsev ◽  
Ruslan E. Asfin
Keyword(s):  
Low Temperature ◽  
Absorption Band ◽  
Strong Absorption ◽  
Reflection Spectra ◽  
Strong Absorption Band

The reactivity of platinum hydrides in the selective hydrogenation of acetic acid over Pt-ReOx/TiO2 catalysts

2020 ◽  
Vol 20 (6) ◽  
pp. 426-432
Author(s):  
N. V. Makolkin ◽  
H. U. Kim ◽  
E. A. Paukshtis ◽  
J. Jae ◽  
B. S. Bal’zhinimaev
Keyword(s):  
Acetic Acid ◽  
Absorption Band ◽  
Electronic State ◽  
Carboxylic Acids ◽  
Selective Hydrogenation ◽  
High Reactivity ◽  
Absorption Bands ◽  
In Situ Drifts ◽  
High Frequencies

In situ DRIFTS was employed to investigate the reaction of hydrogen with supported subnanometer Pt-ReOx species that are active in the hydrogenation of carboxylic acids. Absorption bands of platinum hydrides in the region of 2025–2043 cm–1 were detected; high reactivity of the hydrides toward the adsorbed acetic acid was revealed. In the process, the absorption band of platinum hydride shifted to high frequencies and increased in intensity due to the influence of adjacent acetates on the electronic state of platinum. It was found that in a hydrogen medium the intensity of platinum hydride bands sharply increases after the adsorption of acetic acid and then gradually decreases owing to the reaction of the hydrides with surface acetates.

scholarly journals ON THE INFRARED ABSORPTION OF WATER AND HEAVY WATER IN CONDENSED STATES

1956 ◽  
Vol 34 (6) ◽  
pp. 798-808 ◽  
Author(s):  
Paul A. Giguère ◽  
K. B. Harvey
Keyword(s):  
Thin Films ◽  
Absorption Band ◽  
Water Molecule ◽  
Air Temperature ◽  
Heavy Water ◽  
Infrared Spectra ◽  
Infrared Absorption ◽  
Silver Chloride ◽  
Strong Absorption Band ◽  
Librational Mode

The infrared spectra (from 2 to 30 μ) of thin films of H2O and D2O were measured at various temperatures between 20 ° and −180 °C. A strong absorption band due to the librational mode of the water molecule has its maximum around 710 cm.−1 in the liquid. In ice it is shifted to 800 cm.−1 at −15 °C. and 850 cm.−1 at −170 °C. The corresponding D2O bands show the normal isotope shift. Thin films of water pressed between silver chloride plates could not be crystallized even at liquid air temperature as confirmed by their spectra, which were almost identical with those of the liquid.

Nitrogenous chelate complexes of transition metals. VII. Complexes of silver(I) and silver(II) with tridentate chelating ligands

1970 ◽  
Vol 23 (6) ◽  
pp. 1125 ◽  
Author(s):  
CM Harris ◽  
TN Lockyer
Keyword(s):  
Aqueous Solution ◽  
Schiff Base ◽  
Absorption Band ◽  
Magnetic Moments ◽  
Chelating Ligands ◽  
Chelate Complexes ◽  
Complex Ions ◽  
Strong Absorption Band ◽  
Stable Species ◽  
Complexes Of Transition Metals

Silver(1) complexes of 2,2',2"-terpyridine and a related Schiff base chelate 8-(or-pyridylmethyleneamino)quinoline have been prepared. They are of the type Ag(chelate)X, where X = NO3, ClO4, and PF6. Both Ag(terpy)+ and Ag(pmq)+ are stable in solution and conductance measurements have been obtained. Ag(terpy)PF6 is monomeric in nitrobenzene. Reaction of the above complex ions with pyridine or triphenylphosphine affords stable species of the form [Ag(chelate)(py)]+ and [Ag(chelate)(Ph3P)]+ which have been isolated as their perchlorate salts. Both Ag(chelate)+ and [Ag(ohelate)L]+ involve unusual stereochemistry for AgI. The known paramagnetic AgII complexes Ag(terpy)X2 (X = NO3, ClO4, �S2O8) have been reprepared. They are unstable in solution and reduce readily to AgI. They all show magnetic moments in the range 1.7-1.9 B.M. Ag(terpy)2+ in an aqueous solution of CeIv shows a strong absorption band at 470 mμ (880).

Smoky, blue, greenish yellow, and other irradiation-related colors in quartz

1977 ◽  
Vol 41 (319) ◽  
pp. 301-312 ◽  
Author(s):  
K. Nassau ◽  
B. E. Prescott
Keyword(s):  
Absorption Band ◽  
Absorption Spectroscopy ◽  
Fused Silica ◽  
Blue Color ◽  
Strong Absorption Band ◽  
Synthetic Quartz ◽  
Low Intensity ◽  
Greenish Yellow ◽  
Absorption Features ◽  
Natural And Synthetic

SummaryAlmost 400 specimens of natural and synthetic quartz were γ-irradiated and then heated. Polarized absorption spectroscopy, EPR, and spectrochemical analysis were used to investigate the various colors produced.A blue color originated from absorption by the A1 and A2 bands at 1·85 and 2·55 eV. The substitutional A1 EPR hole-type center usually considered to be the cause of the color in smoky quartz does not correlate with A1 and A2, but with A3, a previously unreported absorption band at 2·90 eV. The A1 and A2 absorptions bleach at temperatures as low as 280 °C and as high as 360 °C the range for A3 being 140 to 380 °C. The B band at 3·95 eV was previously reported only in irradiated fused silica.Greenish-yellow colors (appearing yellow when of low intensity) were observed after irradiation (followed by heating in some instances) in many specimens of natural and synthetic quartz; the color originates from the tail of a strong absorption band in the ultraviolet. The bleaching temperature range is the same as that for A2.The wide variation in color of natural and irradiated smoky quartz can be explained by combinations of the smoky (A3), blue (A1 and A2), and greenish yellow absorption features.

Optical Absorption Spectra of Phosphonyl Radicals

1984 ◽  
Vol 39 (5) ◽  
pp. 434-436 ◽  
Author(s):  
T. Sumiyoshi ◽  
A. Henne ◽  
P. Lechtken ◽  
W. Schnabel
Keyword(s):  
Free Radicals ◽  
Absorption Band ◽  
Flash Photolysis ◽  
Laser Flash Photolysis ◽  
General Structure ◽  
Laser Flash ◽  
Type I ◽  
Phosphine Oxides ◽  
Optical Absorption Spectra ◽  
Strong Absorption Band

Upon UV-irradiation, various phosphine oxides of the general structure I were found to be fragmented readily into free radicals I′ and I″ Laser flash photolysis studies revealed that radicals of type I" with R2 and/or R3 being phenyl groups possess a strong absorption band with a maximum around 330 nm. ε335nm= 1.9×104 1/mol cm was estimated for diphenyl phosphonyl radicals (Ph2P = O).

INFRARED SPECTRA OF XANTHATE COMPOUNDS: III. ORGANIC SOLVENT EFFECT ON THE C=S FREQUENCY

1961 ◽  
Vol 39 (9) ◽  
pp. 1783-1786 ◽  
Author(s):  
L. H. Little ◽  
G. W. Poling ◽  
J. Leja
Keyword(s):  
Absorption Band ◽  
Organic Solvent ◽  
Solvent Effect ◽  
Infrared Spectra ◽  
Characteristic Behavior ◽  
Band Assignment

The previously made absorption-band assignment (1) for the C=S stretching mode in xanthate-type compounds, 1020–1070 cm−1, has been confirmed by the characteristic behavior of the C=S dipole in a range of different solvents (Bellamy and Rogasch (2)).

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