Electronic Absorption and Emission Spectra of 1, 3-Diaryltriazenes

The Pariser-Parr-Pople (PPP) type LCI-SCF-MO calculations were used to study the models of 1, 3-diphenyltriazene (1) , 1, 3-bis(3-pyridyl)triazene (2) , 1, 3-bis (2, 4-dichlorophenyl)triazene (3) , and 1, 3-bis (4-ethoxycarbonyl)triazene (4) . The results of the calculations were compared with the experimental electronic absorption and emission (fluorescence, phosphorescence) spectra of these compounds.     

Spectral line shape fitting in instrumental neutron activation analysis of pottery

The γ-ray spectrum of a neutron-activated clay standard is analyzed by spectral line shape fitting and the results are compared with an empirical analysis of the spectrum based on detector calibrations. It is concluded that trace element analysis of pottery may be simplified and enhanced by a combination of spectral line shape fitting and detector calibrations.     

Phase - transfer catalyser hydrogen-deuterium exchange in thiazoles.

phase transfer catalysis has been used for the first time in a reaction of hydrogen deuterium exchange in heterocyclic chemistry. The method provide a good synthetic path for the synthesis of D - 2 thiazoles by direct exchange. Moreover, even with substituents such as t-butyl, hydrogen exchange on positions adjacent to the alkyl group occured.