The design of receptors for anions coordination is an important task in order to get a good electrochemical signal. 2,6-di(thien-2-yl)-4-(3,8-dimethyl-5-isopropyl-azulen-1-yl)pyrilium perchlorate has been characterized and tested for the anion electrochemical recognition using cyclic voltammetry and differential pulsevoltammetry. It presents modified electrochemical properties in the presence of H2PO4- and F-.

An electrochemical study of 4-(azulen-1-yl)-2,6-bis(2-furyl)- and 4-(azulen-1-yl)-2,6-bis(2-thienyl)-pyridines was performed in order to estimate the influence of electron releasing alkyl substituents on the electrochemical behaviour of these azulenes. The electrochemical parameters obtained by cyclic and differential pulse voltammetry have been correlated with ionization potentials and LUMO energies evaluated through computational methods for the

Two synthesis strategies were used for the generation of azulene-1-yl diazenes substituted at C-3 with a phenyl-chalcogenyl moiety, the synthesis of azulenes substituted at C-3 followed by azo-coupling and azulene substitution at C-3 in azulene-azo dyes. The last synthetic route seems to give more satisfactory results for the synthesis of the desired chalcogenic derivatives. Another target of this study was to investigate the changes induced by the

Azo dyes with either one or two identical or different azulen-1-yl moieties attached to the structure -N2-C6H4-N2-C6H4-N2- were prepared, the phenylene ring being either 1,3-10,30 or 1,4-10,40 disubstituted. The syntheses were accomplished in good yields via mono or bis diazotization of the corresponding anilines followed by the coupling with unsubstituted or alkyl substituted azulenes in acetic/acetate medium. The recorded electronic spectra of

Pyranylium perchlorates with azulene-1-yl moiety in 4-position and thiophen-2-yl or furan-2-yl in 2 and 6-positions were obtained by the substitution of 4-chloro corresponding salts with azulenes. The pyranylium salts are used as starting materials for the synthesis of pyridine and pyridinium salts. The products were characterized and for pyridines pKa was spectroscopically determined. Several attempts were made for pyridine complexation with metal

The synthesis of two new classes of benzo and dibenzo-crown ethers linked on azulenyl moieties by imine or keto group was reported. The imines were obtained by the condensation of (azulene-1-yl)-carbaldehydes with benzo-crown ethers substituted by amino group. The Friedel-Crafts acylation was used for the ketones generation. The products were unequivocally characterized.

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

Electrochemical behaviour and electropolymerization of 4-azulen-1-yl-2,6-bis(2-thienyl)pyridine (L) has been studied. Complexing polymer-coated electrodes have been synthesized by oxidative electropolymerization of L in acetonitrile solutions containing 0.1M tetrabutylammonium perchlorate. The films were characterized by cyclic voltammetry, differential pulse-voltammetry and scanning electron microscopy. The complexing properties of L and these new

Highly conjugated azo-aromatic systems have been prepared in high to moderate yields by linking mono- and bis-azo aromatic fragments to 4-(Rn-azulen-1-yl)-2,6-dimethyl-pyridine. The synthesized p-extended systems have been studied by NMR spectroscopy, UV-Vis and electrochemistry. Systematic increase of the conjugation along the azobenzene skeleton has affected the spectral properties of the azophenyl substituted 4-(azulen-1-yl)-pyridine. The synthesized

Electrochemical study of several 5-(azulen-1-ylmethylene)-2,2-dimethyl-1,3-dioxane-4,6-diones was performed by cyclic and differential pulse voltammetry to evaluate the influence of donor and acceptor substituents on their electrochemical behavior. The number and characteristics of the redox processes for each compound were established. The electrochemical parameters have been correlated with ionization potentials and lowest unoccupied molecular