The purpose of this work is to evidence by spectral methods the complexation effect of the azulenic ligand perchlorate de 2,6-di(tien-2yl)-4-(azulen-1-yl)-pyrilium upon the anions HSO4 -, NO3-, H2PO4-, Br- and I, in view of their molecular ecognition. The tests have been erformed in acetonitrile solutions. The evolution of the ligand absorption spectra during the anions addition has been examined and spectral calibration curves have been obtained.

The formation of substituted poly-azo-azulene films was accomplished through electrochemical oxidation by scanning or controlled potential electrolysis. Conductive or isolating films have been obtained on glassy carbon, using acetonitrile as solvent and 0.1 M tetrabutyl ammonium perchlorate as supporting electrolyte, starting from differently substituted azoazulenes. The optimal conditions for the film formation (potential, charge, azoazulene structure)

The splitting in the electrospray ionization mass spectrometer of several azulen-1-yl diazenes and bis diazenes was analyzed and some general features of fragmentation were evidenced.

Acidity and redox potentials of a series of substituted azulen-1-yl-benzothiazol-2-yl diazenes are correlated with several theoretical parameters. From the electronic spectra of the dyes recorded at different pH, the derived pKa values correlate well with para Hammett-constants. The experimental oxidation and reduction potentials, as determined by cyclic voltammetry (CV) and differential pulse voltammetry (DPV), are in good agreement with the calculated

Several meta and para mono and bis (azulen-1-ylazo) or phenylazo substituted phenylene derivatives, 1-4 were electrochemically characterized using DPV and CV methods. All the compounds presented several oxidation and reduction potentials. These values are correlated with HOMO and LUMO energies; a very good fit for oxidations and an acceptable link for reductions were observed. The influence of the arylazo groups on the potentials is discussed in

[1,3]Dioxane-4,6-diones with (azulen-1-yl)methylene attached to position 5 were obtained by condensation of azulene-1-carbaldehydes with Meldrum’s acid. The reaction was performed either neat or in absolute ethanol using a base as a catalyst. The involvement of the generated C=C bond either in electrophilic or radical reactions appears to be restricted. The advanced molecular polarization of the obtained products can account for the low reactivity

The splitting in the electrospray ionization mass spectrometer of several azulenes substituted in seven-membered ring with 2-thien-2-ylvinyl moiety was analyzed and some general features of fragmentation were evidenced. The fragmentation of propane substituted with azulenes and thienyl moieties was also discussed. Both classes of compounds are obtained in the condensation of alkylazulenes with thiophenealdehyde or the corresponding azomethyne.

The splitting in the electrospray ionization spectrometer of several azulene substituted six-membered heterocycles (pyranylium salts, pyridinium salts, and pyridine) was analyzed and some features of fragmentation were evidenced. The splitting fragments were found to be similar for all heterocycles. The alkyl groups substituted at azulene moiety are broken at the same time with the heterocyclies decomposition. The N+-substituents in pyridinium salts

Our study of bis-azo dyes containing azulen-1-yl moiety was continued by the investigation of bis aromatic diazenes which posses two either identical or different azulene-1-yl groups substituted in either 1,3 or 1,4-positions in bridging phenylene moiety. The syntheses occurred in good yields via diazotization of the 3- or 4-azulen-1-ylazo-phenylamines followed by coupling with azulene in a buffered medium. The electronic spectra of the synthesized

This book presents the preparation of some azulene derivatives that can be used for the modification of the electrodes. Other electrodes, possessing hybrid inorganic-organic materials, are described as electrochemical sensors. Also conducting polymers were tested as sensors, especially for biologic active compounds.