Pyridinium N-phenoxide betaines and their application to the determination of solvent polarities, XXIV. Syntheses and UV-vis spectroscopic properties of new lipophilic tert-butyl- and 1-adamantyl substituted, negatively solvatochromic pyridinium N-phenolate betaine dyes

1998 ◽  
Vol 76 (6) ◽  
pp. 686-694 ◽  
Author(s):  
Christian Reichardt ◽  
Stefan Löbbecke ◽  
Abdol Mohammed Mehranpour ◽  
Gerhard Schäfer
Keyword(s):  
Solvent Polarity ◽  
Spectroscopic Properties ◽  
Tert Butyl ◽  
Nonpolar Solvents ◽  
Phenyl Rings

Syntheses and negative solvatochromism of two new lipophilic pentaphenyl pyridinium N-phenolate betaine dyes, substituted with seven tert-butyl groups (9) or with three tert-butyl and two 1-adamantyl groups (13) in the peripheral phenyl rings, are described in order to get zwitterionic dyes that are more soluble in nonpolar solvents such as the standard betaine dye, 1, which has been used for the construction of an empirical scale of solvent polarity, called the ET(30) scale.Key words: betaine dyes, ET(30) values, lipophilic dyes, pyridinium N-phenolate betaine dyes, solvatochromism, solvent polarity.

Reactivity and NMR Spectroscopic Properties of Tri(tert-butyl)plumbyl-amine

1997 ◽  
Vol 52 (10) ◽  
pp. 1181-1184 ◽  
Author(s):  
Max Herberhold ◽  
Volker Tröbs ◽  
Hong Zhou ◽  
Bernd Wrackmeyer
Keyword(s):  
Magnetic Resonance ◽  
Spectroscopic Properties ◽  
Two Dimensional ◽  
Pyrazole Derivatives ◽  
Coupling Constant ◽  
Tert Butyl ◽  
Magnetic Resonance Data ◽  
Nmr Data ◽  
Resonance Data

Tri(tert-butyl)plumbyl-amine 1 was prepared and studied by one- (1D) and two-dimensional (2D) 1H, 13C, 15N and 207Pb NMR which allowed determination of the coupling signs 1J(207Pb,13C) (> 0), 2J(207Pb,13C) (> 0), 1J(207Pb,15N) (> 0; reduced coupling constant 1K(207Pb,I5N) < 0) and 2J(207Pb-N-1H) (< 0). Transamination of 1 with aniline and pyrazole afforded the corresponding aniline (2) and pyrazole derivatives (3), respectively. N-Lithiation of 1, followed by treatment with Me3SiCl gave the tri(tert-butyl)plumbyl-trimethylsilyl-amine 5. The multinuclear magnetic resonance data of 2, 3 and 5 are presented. Trimethylplumbylphenyl- amine and trimethylplumbyl-tert-butyl(dimethyl)silyl-amine were prepared and their NMR data were measured for comparison.

Solvent effect on simple and high yield synthesis of polydichlorophosphazene precursor Cl3PNSiMe3

2021 ◽  
Author(s):  
Elif Büşra Çelebi ◽  
Ferda Hacıvelioğlu
Keyword(s):  
Solvent Effect ◽  
Room Temperature ◽  
Solvent Polarity ◽  
High Yield ◽  
Effect Of Solvent ◽  
Nonpolar Solvents

The effect of solvent polarity on the reaction of PCl5 with (Me3Si)2NH has been investigated and it is found that nonpolar solvents promote the formation of Cl3PNSiMe3, whereas the more polar chloroform gives unusual phosphazenes at room temperature.

scholarly journals Measurements of The Spectroscopic Properties of Hydrogen Iodide Molecules

2008 ◽  
Vol 5 (3) ◽  
pp. 446-448
Author(s):  
Baghdad Science Journal
Keyword(s):  
Absorption Spectrum ◽  
Quantum Number ◽  
Rotational Quantum Number ◽  
Spectroscopic Properties ◽  
Hydrogen Iodide

A calculation have been carried out for determination some of the spectroscopic properties of Hydrogen Iodide HI molecules such as, the intensity of the absorption spectrum as a function of the variation of the temperature ranging from 10 to 1000 K. This study shows that the populations and hence intensity of the molecule increased as the temperature increased. Another determination of the maximum rotational quantum number Jmax of N2 , CO , BrF AgCl and HI molecules has been carried out.

scholarly journals Determination of the dipole moments of some polar liquids dissolved in polar solvents

1969 ◽  
Vol 47 (20) ◽  
pp. 3767-3771 ◽  
Author(s):  
H. A. Rizk ◽  
N. Youssef ◽  
H. Grace
Keyword(s):  
Dipole Moments ◽  
Butyl Alcohol ◽  
Polar Solvents ◽  
Tert Butyl ◽  
Tert Butyl Alcohol ◽  
Initial Decrease ◽  
Interacting Systems ◽  
Solvent Molecules ◽  
Onsager Equation

The application of a modified form of the Onsager equation at the condition of infinite dilution of a polar solute in a polar solvent leads to reasonable dipole moments for water, pyridine, acetone, tert-butyl alcohol, n-butyl alcohol, and β-octyl alcohol, except in the case of water in tert-butyl alcohol at 30 and 40 °C and the case of acetone in n-butyl alcohol at 30 to 50 °C. The initial decrease of the dielectric constant of solvent by addition of solute in each of these two cases is associated with a reduction in the Kirkwood g-factor of solute. In all 12 systems investigated, strong hydrogen bonding occurs between solute and solvent molecules and often between solvent molecules themselves. It is thought that this equation must fail when short-range interactions assume predominant importance, but why it works so well for those cases which are also strongly interacting systems is not clear.

Electrochemical determination of antioxidant properties of a series of tetraphenylporphyrin derivatives and their zinc complexes

2015 ◽  
Vol 19 (09) ◽  
pp. 1032-1038 ◽  
Author(s):  
Mariya V. Tesakova ◽  
Aleksandr S. Semeikin ◽  
Vladimir I. Parfenyuk
Keyword(s):  
Antioxidant Capacity ◽  
Antioxidant Properties ◽  
Electrochemical Determination ◽  
Zinc Complexes ◽  
Oh Groups ◽  
Electron Absorption Spectra ◽  
Before And After ◽  
Phenyl Rings ◽  
Effect Of Structure

Zinc complexes of a series of substituted tetraphenylporphyrins containing OH-groups in the phenyl rings were synthesized. Their antioxidant capacity was estimated in reaction of the porphyrins with 2,2′-diphenyl-1-picrylhydrazyl (DPPH) by cyclic voltammetry. The electron absorption spectra of the all synthesized compounds before and after the reaction with 2,2′-diphenyl-1-picrylhydrazyl were recorded. The effect of structure of the porphyrins and zinc complexes on their antioxidant capacity was discussed.

Magneto-structural correlation of cyano-substituted 3-tert-butyl-1-phenyl-1,2,4-benzotriazin-4-yl: spin transition behaviour observed in a 6-cyano derivative

2018 ◽  
Vol 42 (12) ◽  
pp. 9949-9955 ◽  
Author(s):  
Yusuke Takahashi ◽  
Naoya Tsuchiya ◽  
Youhei Miura ◽  
Naoki Yoshioka
Keyword(s):  
Spin Transition ◽  
Spectroscopic Properties ◽  
Tert Butyl ◽  
Structural Correlation ◽  
Transition Behaviour

New cyano-substituted 3-tert-butylbenzotriazinyls, 7CN and 6CN, were synthesized and their spectroscopic properties and magneto-structural correlation were investigated.

scholarly journals 1,3,4-Thiadiazole-Containing Azo Dyes: Synthesis, Spectroscopic Properties and Molecular Structure

Molecules ◽  
2020 ◽  
Vol 25 (12) ◽  
pp. 2822
Author(s):  
Agnieszka Kudelko ◽  
Monika Olesiejuk ◽  
Marcin Luczynski ◽  
Marcin Swiatkowski ◽  
Tomasz Sieranski ◽  
...  
Keyword(s):  
Azo Dyes ◽  
Density Functional ◽  
Density Functional Theory Calculations ◽  
Spectroscopic Properties ◽  
Radiation Absorption ◽  
Functional Theory ◽  
Chemical Structures ◽  
Vis Spectroscopy ◽  
High Yields

Three series of azo dyes derived from 2-amino-5-aryl-1,3,4-thiadiazoles and aniline, N,N-dimethylaniline and phenol were synthesized in high yields by a conventional diazotization-coupling sequence. The chemical structures of the prepared compounds were confirmed by 1H-NMR, 13C-NMR, IR, UV-Vis spectroscopy, mass spectrometry and elemental analysis. In addition, the X-ray single crystal structure of a representative azo dye was presented. For explicit determination of the influence of a substituent on radiation absorption in UV-Vis range, time-dependent density functional theory calculations were performed.

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