Photoelectron Spectroscopy of Heterocycles
نویسنده
چکیده
The photoelectron (PE) spectra of l-(4-pyrimidyl)-2-(3-pyridyl)-ethene 1, l-(2-pyrimidyl)-2(3-pyridyl)-ethene 2, l-(4-pyridazinyl)-2-(3-pyridyl)-ethene 3, l-(3-pyridazinyl)-2-(3-pyridyl)ethene 4 and l-(2-pyrazinyl)-2-(3-pyridyl)-ethene 5 all in their trans conformations have been recorded using Hel radiation. Comparisons with the PE spectra of styrylpvridines, dipyridylethenes and diazabenzenes allowed the assignment of all ionization energies, Ei, corresponding to 7iand nitrogen lone pair ionizations in the region of Ei < 12 eV. The variations in PE spectra of five isomeric triazastilbenes studied are due to different nitrogen atom positions in the diazinvl ring.
منابع مشابه
Photoelectron Spectroscopy of Heterocycles . Fluorene Analogues *
The He(I) photoelectron spectra of fluorene and its analogues, biphenyl, dibenzofuran, carbazole, dibenzothiophene, and phenanthrene were measured and analyzed. The assignment of the ^-electron ionizations using orbital interaction and symmetry arguments for the constituent parts of the molecules indicates that the energy levels of the fluorene analogues can be reproduced within a few percent o...
متن کاملThe Potentiodynamic Behavior of Copper in NaCI Solutions Studied by Auger and Photoelectron Spectroscopy
The potentiodynamic behaviour of copper in brine solutions was studies. Auger and photo-electron spectroscopy were used together with electrochemical methods. It is demostrated that the passivation observed in potentiodynamic curves is due to a surface film formation on a copper electrode. It is concluded that this film must be copper (I) chloride in nature. Effect of different factors on poten...
متن کاملPhotoelectron Spectroscopy of Heterocycles. Polypyridines
The photoelectron (PE) spectra of 2,2'-bipyridine 1, 2 ,2 ' :6 ' ,2"-terpyridine 2, and 2,2 ' ,2" ,2" / tetrapyridine 3 have been measured using H e I radiation. For 1 — 3 standard SCF LCAO MO calculations wer also performed. Comparison of P E spectra and these calculations allowed the assignment o f Ti-ionizations and indirectly also the nitrogen lone pair ionizations in 1 — 3. Factors influen...
متن کاملPhotoelectron Spectroscopy of Heterocycles. Indene Analogs
The He (I) photoelectron (PE) spectra of indene, indole, benzofuran, benzothiophene, 1-, 2-, 3-, 4and 6-methylindole and 4,5,6,7-tetrafluoroindole were measured and analysed. A close correlation between the jr-ionisation energies of these compounds and the eigenvalues of the corresponding HMO-orbitals is found. A qualitative scheme for the assignment of the ^-electron ionisations by orbital int...
متن کاملNew Activated Carbon from Persian Mesquite Grain as an Excellent Adsorbent
This paper presents a systematic study of the surface chemistry, porous texture and adsorptive characteristics of prepared new activated carbon using Persian mesquite grain. Several techniques and methodologies such as, proximate analysis, N2 adsorption–desorption isotherms, scanning electron microscope (SEM), Fourier transform infrared spectroscopy(FT-IR), X-ray Diffraction (XRD), X-ray photoe...
متن کامل