Spectroscopic Study and Semi-empirical Calculations of Tautomeric Forms of Schiff Bases Derived from 2-hydroxy- 1-naphthaldehyde and Substituted 2-aminothiophene

2010 ◽  
Vol 3 ◽  
pp. 1-8 ◽  
Keyword(s):  
Spectroscopic Study ◽  
Schiff Bases ◽  
Tautomeric Forms ◽  
Semi Empirical

scholarly journals Physicochemical Investigations of Th(IV) and UO2(VI) Complexes with New Schiff Bases Along with their Toxic Effects

2010 ◽  
Vol 7 (3) ◽  
pp. 1045-1054 ◽  
Author(s):  
Sonal Agnihotri ◽  
Kishor Arora
Keyword(s):  
Schiff Bases ◽  
Elemental Analysis ◽  
Toxic Effects ◽  
Spectral Studies ◽  
Coordination Numbers ◽  
Semi Empirical

Schiff bases were obtained usingp-trimethoxy benzaldehyde,p-hydroxyl benzaldehyde and 2-amino pyridine to prepare new complexes of thorium(IV) and dioxouranium(VI) metals by various anions. The synthesized ligands and complexes were analytically studied through spectral studies, elemental analysis conductance measurements along with semi empirical and thermogravimetric methods. The complexes were assigned various coordination numbers ranging from 6-10 on the basis of these studies.

scholarly journals Spectroscopic study of the Schiff bases of dodecylamine with pyridoxal 5′-phosphate and 5′-deoxypyridoxal. A model for the Schiff bases of pyridoxal 5′-phosphate in biological systems

1991 ◽  
Vol 279 (3) ◽  
pp. 759-767 ◽  
Author(s):  
M A Vázquez ◽  
F Muñoz ◽  
J Donoso ◽  
F García Blanco
Keyword(s):  
Aqueous Solutions ◽  
Spectroscopic Study ◽  
Absorption Spectra ◽  
Aromatic Ring ◽  
Schiff Bases ◽  
Pyridine Ring ◽  
Glycogen Phosphorylase ◽  
Ph Values ◽  
Pyridine Nitrogen ◽  
Deconvolution Techniques

We recorded the absorption spectra of the Schiff bases of pyridoxal 5′-phosphate (PLP) and 5′-deoxypyridoxal (DPL) with dodecylamine (DOD) at different pH values. By applying deconvolution techniques to the spectra and analysing their different components we found that the above-mentioned Schiff bases in aqueous solutions of pH 7 adopted a conformation in which the pyridine ring is embedded in a very hydrophobic medium from which water is virtually completely excluded. This conformation in the same as that adopted by PLP when it acts as coenzyme for some enzymes such as glycogen phosphorylase. The experimental results obtained also show such a conformation to be highly favoured but sensitive to the protonation of the pyridine nitrogen, which makes the aromatic ring more readily accessible to the solvent.

A crystallographic and spectroscopic study on the imine-amine tautomerism of 2-hydroxyaldimine compounds

2006 ◽  
Vol 221 (10) ◽  
Author(s):  
Hasan Nazir ◽  
Cengiz Arici ◽  
Kaan C. Emregül ◽  
Orhan Atakol
Keyword(s):  
Molecular Structure ◽  
Spectroscopic Study ◽  
Schiff Bases ◽  
Ftir Spectra ◽  
Molecular Structures ◽  
X Ray Diffraction ◽  
X Ray ◽  
The Difference ◽  
Difference Fourier

AbstractThe molecular structures of N-(2-hydroxy ethyl)-3,5-dinitrosalicylaldimine and N-N′-bis(acetophe-nylketimine)-1,4-diaminobuthane were determined using X-ray diffraction. It was established using the difference Fourier map that the phenolic hydrogens were situated on the iminic nitrogen. Identical observations of the molecular structure were made for similar Schiff bases in literature, and it was established that this situation was not in agreement with the IR and NMR results. The molecular structure of N-(4-hydroxylphenyl)-benzaldimine was determined using X-ray diffraction for comparison. Similar compounds were prepared and their FTIR spectra were investigated.

scholarly journals IR Spectroscopic Study of Triiodosilane (SiHI3) by Using Semi-empirical Quantum Program

2021 ◽  
Vol 1818 (1) ◽  
pp. 012014
Author(s):  
Orass Abdulhadi Hussein ◽  
Dawood M. Khudhair ◽  
Alyaa A. Alrazaq A. Aljbar
Keyword(s):  
Spectroscopic Study ◽  
Semi Empirical ◽  
Ir Spectroscopic

Semi-empirical calculation and spectroscopic study of protonated poly(p-phenylene benzobisoxazole) models

Polymer ◽  
2004 ◽  
Vol 45 (26) ◽  
pp. 8871-8879 ◽  
Author(s):  
Dongdong Feng ◽  
Shanfeng Wang ◽  
Qixin Zhuang ◽  
Pingping Wu ◽  
Zhewen Han
Keyword(s):  
Spectroscopic Study ◽  
Semi Empirical

Biocidal and Spectroscopic Study of the Co(II), Ni(II) and Cu(II) Complexes with Schiff Bases

2012 ◽  
Vol 28 (4) ◽  
pp. 1871-1876
Author(s):  
B.K. RAI ◽  
ARUN KUMAR ◽  
AKHILESH BALUNI
Keyword(s):  
Spectroscopic Study ◽  
Schiff Bases
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