The reported results in this paper confirm the previous statement on the limited validity of the EE rule for the molecular ion generation when ESI method was used in mass spectrometer. Thus, the ratio [M].+/[M+1]+ increases with the molecule oxidizability until the absence of the protonated form; therefore, in several cases the base peak fragment is not always an EE fragment. In addition to the basic fragmentation of the compounds with one selenium

Colored Benzo- and dibenzo-crown ethers with (azulene-1-yl) azo chromophore(s) at benzo ring(s) were synthesized in good yields starting from the amines of the benzo- and dibenzo-crown ethers which were diazotized and coupled with azulenes. The obtained crown ethers were characterized and several properties of the generated new dyes were investigated (electronic and NMR-spectra, as well as pKa values, the lipophilicity and the coordination with metal

This work was devoted to the synthesis and characterization of newindolizine derivatives. Particular attention was paid to electrochemical investigations by cyclic voltammetry and differential pulse voltammetry. The redox processes for each compound were established, analyzed and assigned to the particular functional groups at which they occur. This assignment was based on detailed comparisons between the electrochemical behaviour of the compounds,