CONFORMATION-SPECIFIC IR AND UV SPECTROSCOPY OF A SERIES OF SYNTHETIC FOLDAMERS: _/_3- AND _3- ALA DIPEPTIDES

2019 ◽  
Author(s):  
Dewei Sun ◽  
Timothy Zwier ◽  
Joshua Fischer ◽  
Karl Blodgett
Keyword(s):  
Uv Spectroscopy ◽  
Ir And Uv Spectroscopy

scholarly journals 7-Bromo-[1,2,5]selenadiazolo[3,4-d]pyridazin-4(5H)-one

Molbank ◽  
10.3390/m1229 ◽  
2021 ◽  
Vol 2021 (2) ◽  
pp. M1229
Author(s):  
Timofey N. Chmovzh ◽  
Oleg A. Rakitin
Keyword(s):  
Mass Spectrometry ◽  
Heterocyclic System ◽  
High Resolution Mass Spectrometry ◽  
Uv Spectroscopy ◽  
Hydrolysis Product ◽  
Selenium Dioxide ◽  
Biologically Active ◽  
Photovoltaic Materials ◽  
Organic Photovoltaic Materials ◽  
Ir And Uv Spectroscopy

New heterocyclic systems containing 1,2,5-chalcogenadiazoles are of great interest for the creation of organic photovoltaic materials and biologically active compounds. In this communication, 3,6-dibromopyridazine-4,5-diamine was investigated in reaction with selenium dioxide in order to obtain 4,7-dibromo-[1,2,5]selenadiazolo[3,4-d]pyridazine. We found that 7-bromo-[1,2,5]selenadiazolo[3,4-d]pyridazin-4(5H)-one, the first representative of the new heterocyclic system, was isolated as a hydrolysis product of the corresponding 4,7-dibromoderivative. The structure of the newly synthesized compound was established by means of elemental analysis, high-resolution mass spectrometry, 1H, 13C NMR, IR and UV spectroscopy, and mass spectrometry.

Cyclic Constraints on Conformational Flexibility in γ-Peptides: Conformation Specific IR and UV Spectroscopy

2013 ◽  
Vol 117 (47) ◽  
pp. 12350-12362 ◽  
Author(s):  
Patrick S. Walsh ◽  
Ryoji Kusaka ◽  
Evan G. Buchanan ◽  
William H. James ◽  
Brian F. Fisher ◽  
...  
Keyword(s):  
Uv Spectroscopy ◽  
Conformational Flexibility ◽  
Ir And Uv Spectroscopy

Quantitative determination of the vinylthio groups in divinyl sulphide copolymers by IR and UV spectroscopy

1981 ◽  
Vol 23 (7) ◽  
pp. 1845-1847
Author(s):  
L.V. Morozova ◽  
E.I. Brodskaya ◽  
D.-S.D. Taryashinova ◽  
S.V. Amosova ◽  
B.A. Trofimov
Keyword(s):  
Quantitative Determination ◽  
Uv Spectroscopy ◽  
Ir And Uv Spectroscopy

scholarly journals Diastereo-specific conformational properties of neutral, protonated and radical cation forms of (1R,2S)-cis- and (1R,2R)-trans-amino-indanol by gas phase spectroscopy

2015 ◽  
Vol 17 (39) ◽  
pp. 25809-25821 ◽  
Author(s):  
Aude Bouchet ◽  
Johanna Klyne ◽  
Giovanni Piani ◽  
Otto Dopfer ◽  
Anne Zehnacker
Keyword(s):  
Electronic Structure ◽  
Gas Phase ◽  
Radical Cation ◽  
Amino Alcohol ◽  
Uv Spectroscopy ◽  
Conformational Properties ◽  
Gas Phase Spectroscopy ◽  
Ir And Uv Spectroscopy

The effects of ionisation and protonation on the geometric and electronic structure of a prototypical aromatic amino-alcohol with two chiral centres are revealed by IR and UV spectroscopy.

Etude en rmn 13C de bicyclo[4,n,0]alcanones-3 trans α-substitués. Influence de la nature et de l'orientation du substituant sur le déplacement chimique du 13C du carbonyle

1980 ◽  
Vol 58 (15) ◽  
pp. 1503-1511 ◽  
Author(s):  
Pierre Metzger ◽  
Eliette Casadevall ◽  
André Casadevall ◽  
Marie-José Pouet
Keyword(s):  
Convenient Method ◽  
Nmr Spectra ◽  
Chemical Shifts ◽  
Uv Spectroscopy ◽  
Substituent Effects ◽  
Fixed Ring ◽  
C Nmr ◽  
Ir And Uv Spectroscopy

The 13C nmr spectra of α, αα, and αα′ substituted trans-fused bicyclo [4,n,0]alkan-3 ones, are described. Substituent effects are discussed in terms of their electron withdrawing character, axial or equatorial configuration, and cyclohexane deformation. 13C=O chemical shifts are shown to be based on the polarization of π bond and on C=O/X non-bonded interactions. As in ir and uv spectroscopy, 13C nmr is a convenient method for detecting an a substituent configuration in fixed ring ketones.

scholarly journals N,N-Bis(4’-(hexyloxy)-[1,1’-biphenyl]-4-yl)thiophen-2-amine

Molbank ◽  
10.3390/m1290 ◽  
2021 ◽  
Vol 2021 (4) ◽  
pp. M1290
Author(s):  
Timofey N. Chmovzh ◽  
Oleg A. Rakitin
Keyword(s):  
Mass Spectrometry ◽  
High Resolution ◽  
High Resolution Mass Spectrometry ◽  
Uv Spectroscopy ◽  
Optoelectronic Devices ◽  
Coupling Reaction ◽  
Cross Coupling ◽  
Cross Coupling Reaction ◽  
Resolution Mass ◽  
Ir And Uv Spectroscopy

N,N-Diarylthiophen-2-amine units are of great interest for the synthesis of optoelectronic devices. In this communication, N,N-bis (4’-(hexyloxy)-[1,1’-biphenyl]-4-yl)thiophen-2-amine was obtained by means of a Buchwald–Hartwig cross-coupling reaction of bis(4’-(hexyloxy)-[1,1’-biphenyl]-4-yl)amine and 2-bromothiophene in the presence of tris(dibenzylideneacetone)dipalladium(0), tri-tert-butyl phosphine and sodium tert-butanolate. The structure of newly synthesized compounds was established by means of elemental analysis, high-resolution mass spectrometry, 1H, 13C NMR, IR and UV spectroscopy and mass-spectrometry.

Nano-scale microstructure of Fe3+-, OH−-bearing crystalline inclusions in experimentally oxidized olivine from a mantle nodule

2000 ◽  
Vol 64 (2) ◽  
pp. 319-335 ◽  
Author(s):  
N. R. Khisina ◽  
K. Langer ◽  
M. Andrut ◽  
A. V. Ukhanov ◽  
R. Wirth
Keyword(s):  
Solid State ◽  
Electron Diffraction ◽  
Diffraction Data ◽  
Uv Spectroscopy ◽  
Electron Diffraction Data ◽  
State Transformation ◽  
Solid State Transformation ◽  
Crystalline Inclusions ◽  
Precursor Phase ◽  
Ir And Uv Spectroscopy

AbstractAn olivine grain from peridotite nodule 9206 (Udachnaya kimberlite) was heated in air at 700°C for 9 h. It was investigated by EMPA, by IR and UV spectroscopy and by TEM. The TEM examination reveals hexagon-like inclusions up to several hundred nm in size with a core and rim structure. The AEM data show that the inclusions contain only Mg, Fe and Si as cations. The rims have almost the same composition as the olivine matrix whereas the cores are enriched in iron and depleted in Mg. Electron diffraction data, SAED and CBED, indicate that the rims are composed of a ‘secondary’ olivine while the cores are composed of coexisting feroxyhite FeOOH, bernalite Fe(OH)3 and β-cristobalite SiO2. The presence of nm-sized inclusions in minerals is expected to influence the interpretation of spectroscopic results if spectroscopy is carried out without knowledge of the microstructure.It is speculated that the complex microstructure of the inclusions is a result of a solid state transformation of a precursor phase, probably a hydrous magnesian silicate, during the experimental heating and oxidation.

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