A spectroscopic study of proton transfer and photochromism in N-(2-hydroxybenzylidene)aniline

1982 ◽  
Vol 60 (13) ◽  
pp. 1738-1746 ◽  
Author(s):  
J. W. Lewis ◽  
C. Sandorfy
Keyword(s):  
Double Bond ◽  
Low Temperature ◽  
Infrared Spectrum ◽  
Spectroscopic Study ◽  
Title Compound ◽  
Spectral Characteristics ◽  
Absorption Bands ◽  
Central Carbon ◽  
Infrared Spectral ◽  
Nitrogen Double Bond

The infrared spectral characteristics of N-(2-hydroxybenzylidene)aniline, its deuterium substituted analogue, N-(2-hydroxybenzylidene)-m-toluidine, and their photoproducts have been investigated. The infrared spectrum of a low temperature polycrystalline film of N-(2-hydroxybenzylidene)aniline exhibits new absorption bands at 3380, 1646, 1537, 1502, 1319, and 1310 cm−1 upon irradiation at 365 nm. Likewise, the spectrum of the m-toluidine derivative exhibits new absorption bands at 3320, 1650, 1535, 1503, 1321, 1310, and 995 cm−1 upon irradiation at 365 nm. These new data, in conjunction with the newly acquired data on the hydrochloride and deuterochloride of the title compound, indicate that the photoproduct is a zwitterion, not an ortho-quinone. It is also inferrred that the photoproduct exists in a conformation which is cis about the central carbon–nitrogen double bond.

Infrared Analysis of Isomerized, Vulcanized, and Oxidized Natural Rubber

1955 ◽  
Vol 28 (1) ◽  
pp. 213-223 ◽  
Author(s):  
G. Salomon ◽  
A. Chr van der Schee
Keyword(s):  
Double Bond ◽  
Infrared Spectrum ◽  
Natural Rubber ◽  
Infrared Spectra ◽  
Infrared Analysis ◽  
Side Group ◽  
Oxidation Reactions ◽  
Absorption Bands ◽  
Group Ii

Abstract This paper is a continuation of our study on the infrared spectra of natural rubber and its derivatives. It was found previously that, in certain reactions of rubber, the original double bond (I) is shifted to the side group (II) and that this leads to significant changes in the chemical and mechanical behavior of the polymer. Others have also reported the occurrence of groups (II) and (III) in rubber and certain rubber derivatives. Group (II) is also found in synthetic polyisoprenes as a result of 3,4-polymerization. We have now measured the intensities of the absorption bands of the rubber spectrum and changes produced by cyclization and isomerization. Certain statements on the formation of (II) and (III) during vulcanization were at variance with our experience, but a detailed investigation cleared up some misconceptions. Modifications brought about by oxidation are chemically related to those produced by sulfuration reactions. A classification of oxidation reactions, based on typical changes in the infrared spectrum, will be proposed in the discussion.

Infrared Intensity Measurements of Cryodeposited Thin Films of NH3, NH4HS, H2S, and Assignments of Absorption Bands

1980 ◽  
Vol 34 (5) ◽  
pp. 525-533 ◽  
Author(s):  
John R. Ferraro ◽  
G. Sill ◽  
U. Fink
Keyword(s):  
Thin Films ◽  
Low Temperature ◽  
Metastable Phase ◽  
Cubic Phase ◽  
Spectral Transmission ◽  
Absorption Bands ◽  
Intensity Measurements ◽  
Infrared Spectral ◽  
Infrared Intensity ◽  
Transmission Measurements

Interferometric infrared spectral transmission measurements from 60 to 10 000 cm−1 were made for thin films of NH3, NH4HS, and H2S cryodeposits, and recorded as a function of thickness and temperature from 88 K to evaporation points. Integrated band intensities were measured and are reported for all major absorptions. Assignments for lattice and internal fundamental modes are discussed. Particular attention is devoted to the various reported phases of solid NH3, and it is concluded that three phases are supported by experimental evidence: the stable cubic phase, a low temperature amorphous phase, and an intermediate temperature metastable phase. Results and changes of the spectra as a function of temperature will be summarized. Intercomparisons of the spectra obtained for the three cryodeposits are made.

scholarly journals Crystal structure of (3E)-3-(2,4-dinitrophenoxymethyl)-4-phenylbut-3-en-2-one

2014 ◽  
Vol 70 (9) ◽  
pp. o1051-o1052 ◽  
Author(s):  
Ignez Caracelli ◽  
Stella H. Maganhi ◽  
Paulo J. S. Moran ◽  
Bruno R. S. de Paula ◽  
Felix N. Delling ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Double Bond ◽  
Nitro Group ◽  
Benzene Ring ◽  
Torsion Angle ◽  
Title Compound ◽  
Phenyl Ring ◽  
Aromatic Rings ◽  
Compound C ◽  
The One

In the title compound, C17H14N2O6, the conformation about the C=C double bond [1.345 (2) Å] isE, with the ketone moiety almost coplanar [C—C—C—C torsion angle = 9.5 (2)°] along with the phenyl ring [C—C—C—C = 5.9 (2)°]. The aromatic rings are almost perpendicular to each other [dihedral angle = 86.66 (7)°]. The 4-nitro moiety is approximately coplanar with the benzene ring to which it is attached [O—N—C—C = 4.2 (2)°], whereas the one in theorthoposition is twisted [O—N—C—C = 138.28 (13)°]. The molecules associateviaC—H...O interactions, involving both O atoms from the 2-nitro group, to form a helical supramolecular chain along [010]. Nitro–nitro N...O interactions [2.8461 (19) Å] connect the chains into layers that stack along [001].

Absorption Bands and Luminescence of LiF Irradiated at Low Temperature

1950 ◽  
Vol 78 (3) ◽  
pp. 293-293 ◽  
Author(s):  
Peter Pringsheim ◽  
Philip Yuster
Keyword(s):  
Low Temperature ◽  
Absorption Bands

scholarly journals 1-Methyl-3-phenylthiourea

2014 ◽  
Vol 70 (5) ◽  
pp. o528-o528
Author(s):  
Hou-xiang Su
Keyword(s):  
Double Bond ◽  
Hydrogen Bonds ◽  
Dihedral Angle ◽  
Title Compound ◽  
Phenyl Isothiocyanate ◽  
Compound C

The title compound, C8H10N2S, was prepared by reaction of methylamine solution, KOH and phenyl-isothiocyanate in ethanol. It adopts asyn-Me andanti-Ph conformation relative to the C=S double bond. The dihedral angle between the N—C(=S)—N thiourea and phenyl planes is 67.83 (6)°. In the crystal, the molecules centrosymmetrical dimers by pairs of N(Ph)—H...S hydrogen bonds. The dimers are linked by N(Me)—H...S hydrogen bonds into layers parallel to (100).

Configuration stability at the carbon-nitrogen double bond

1962 ◽  
Vol 3 (26) ◽  
pp. 1269-1274 ◽  
Author(s):  
D.Y. Curtin ◽  
C.G. McCarty
Keyword(s):  
Double Bond ◽  
Nitrogen Double Bond

Basic Chromium(III) Formate: Reaction of Chromiiim(III) Chloride with Formic Acid

1979 ◽  
Vol 34 (2) ◽  
pp. 160-162 ◽  
Author(s):  
R. C. Paul ◽  
P. Kapoor ◽  
. B. Baidya ◽  
R. Kapoor
Keyword(s):  
Formic Acid ◽  
Spectral Data ◽  
Magnetic Moment ◽  
Title Compound ◽  
Temperature Range ◽  
Infrared Spectral ◽  
Anhydrous Formic Acid

Abstract Chromium(III) Chloride, Basic Chromium(III) Formate, IR, Thermogravimetry, Magnetic Moment Chromium(III) chloride reacts with anhydrous formic acid to give basic chromium(III) formate [Cr3O(OOCH)6(H2O)2(HCOOH)](OOCH), HCOOH. Its reactions with bases (B) give compounds of the general composition [Cr30(C00CH)6(B)3](00CH). The title compound has been characterized by infrared spectral data, temperature range (266-110K) magnetic moment and thermogravimetry.

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