The conformation of some trimethylsilylesters by spectroscopic methods

1991 ◽  
Vol 56 (6) ◽  
pp. 1180-1183
Author(s):  
Souad F. Al-Azzawi ◽  
Marie Jakoubková
Keyword(s):  
Ir Spectra ◽  
Carboxylic Acids ◽  
Absorption Spectra ◽  
Temperature Effects ◽  
Spectroscopic Methods ◽  
Ir Absorption ◽  
Conformational Heterogeneity ◽  
Doublet Structure ◽  
Ir Absorption Spectra

The doublet structure of v(C=O) bands in the IR absorption spectra of some trimethylsilylesters of carboxylic acids XCOOY [X = CCl3, CCl2H, CClH2, C(CH3)3, CH2Si(CH3)3] indicates conformational heterogeneity. The conformations of these esters were studied by analyzing the changes in IR spectra caused by solvent and temperature effects.

Effects of structural features on the IR absorption spectra of liquid-crystal carboxylic acids

1988 ◽  
Vol 48 (1) ◽  
pp. 67-69
Author(s):  
N. R. Posledovich ◽  
M. V. Nikanovich ◽  
A. A. Min'ko ◽  
V. S. Bezborodov
Keyword(s):  
Liquid Crystal ◽  
Carboxylic Acids ◽  
Absorption Spectra ◽  
Structural Features ◽  
Ir Absorption ◽  
Ir Absorption Spectra

IR spectra of deuterated propene analogues of Zeise's salt

1985 ◽  
Vol 50 (12) ◽  
pp. 2647-2655 ◽  
Author(s):  
Roman Řeřicha ◽  
Miroslav Zdražil
Keyword(s):  
Ir Spectra ◽  
Absorption Spectra ◽  
Ir Absorption ◽  
Weak Band ◽  
Ir Absorption Spectra ◽  
Deformation Frequency

The IR absorption spectra (4 000-250 cm-1) of anhydrous K[(propene)PtCl3], using propene-2-d1 and propene-1,1-d2 as the ligands, were measured in KBr discs. A new weak band for the fundamental deformation frequency of the C-C=C skeleton softened by the coordination of the propenes was found around 400 cm-1, namely at 420, 417, and 375 cm-1 for d0, d1, and d2 species, resp. Vibrational couplings of the so-called ν(C=C) with other modes of the ligands is discussed.

Near-IR Absorption Spectra for the Buckminsterfullerene Anions: An Experimental and Theoretical Study

1992 ◽  
Author(s):  
Del R. Lawson ◽  
Daniel L. Feldheim ◽  
Colby A. Foss ◽  
Peter K. Dorhoug ◽  
C. M. Elliott
Keyword(s):  
Absorption Spectra ◽  
Theoretical Study ◽  
Ir Absorption ◽  
Near Ir ◽  
Ir Absorption Spectra

Study of the Infrared Absorption Spectra of Some Pyridine Derivatives-Iodine Complexes

1976 ◽  
Vol 30 (2) ◽  
pp. 200-204 ◽  
Author(s):  
F. M. Abdel Kerim ◽  
F. Abou El Fotouh
Keyword(s):  
Complex Formation ◽  
Absorption Spectra ◽  
Infrared Absorption ◽  
Ir Absorption ◽  
Pyridine Derivatives ◽  
Thermodynamic Constants ◽  
Ir Absorption Spectra ◽  
Infrared Absorption Spectra ◽  
The Stability ◽  
Iodine Complexes

The ir absorption spectra of some pyridine derivatives-iodine complexes were measured in the region 400 to 1400 cm−1 and the results are discussed. The effect of complex formation on the intensities of some of the bands was investigated. The thermodynamic constants of these complexes were calculated. It was found that the stability of the complex depends to a large extent on the electronegativity as well as the position of the substituent on the pyridine nucleus. The structures of formed complexes are discussed.

scholarly journals Влияние концентрации примеси магния на электрические свойства кристаллов LiNbO-=SUB=-3-=/SUB=-

2021 ◽  
Vol 63 (10) ◽  
pp. 1566
Author(s):  
А.В. Яценко ◽  
С.В. Евдокимов ◽  
В.Ф. Шульгин ◽  
М.Н. Палатников ◽  
Н.В. Сидоров ◽  
...  
Keyword(s):  
Electrical Conductivity ◽  
Absorption Spectra ◽  
Impurity Content ◽  
Threshold Value ◽  
Ir Absorption ◽  
Temperature Range ◽  
Polar Direction ◽  
Ir Absorption Spectra ◽  
Mg Content

Using the results of studying the electrical conductivity in the temperature range of ~ 295-460 K and the IR absorption spectra of a series of LiNbO3: Mg crystals, it is shown that as the Mg content in the sample increases, the mobility of H+ ions sharply decreases when moving along the polar direction. This effect is most clearly manifested in the samples of LiNbO3: Mg crystals with a high (above threshold value) impurity content.

Sign in / Sign up

Export Citation Format

Share Document