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Publicatii proprii
Colored Benzo-crown ethers substituted with (azulene-1-yl) azo chromophores. Synthesis and properties
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
Read moreSynthesis and electrochemical characterization of substituted indolizine carboxylates
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,
Read moreFragmentation in Mass Spectrometer of some Phenylselanylated Azulenes and of the Corresponding Selenoxide and Selenone
The fragmentation of unsubstituted and substituted 1-phenylselanyl-azulenes, as well as of the corresponding selenoxides and selenones in the electrospray ionization mass spectrometer, was reported and examined. Both their molecular peaks and the fragmentation paths were discussed in function of the azulene substituents and of the selenium oxidation states.
Read moreSynthesis and Electrochemical Characterization of Substituted Pyrrolo[1,2-c]pyrimidine Carboxylates
This work is devoted to the synthesis and characterization of new pyrrolo[1,2-c]pyrimidine derivatives. The electrochemical investigations have been done by cyclic voltammetry and differential pulse voltammetry. The redox processes for each compound were established, analyzed and an assessment was proposed to the particular functional groups at which they take place. It was based on comparison between the electrochemical behaviour of the compounds,
Read moreSteinmanniporella, a new genus name for „Linoporella” with two orders of laterals.
After Barattolo (Abstracts of the 5th international symposium on fossil algae, 1991) and Barattolo and Romano (Bollettino della Societa Paleontologica Italiana, 44(3): 237–254, 2005) emended the diagnosis of the genus Linoporella Steinmann to include species with three orders of laterals, algae included formerly in this genus but with only two orders of laterals remained in open nomenclature. Comparisons of these algae with other Jurassic and Cretaceous
Read moreZittelina massei n. sp., a new dasycladacean alga from the Lower Cretaceous strata of Pădurea Craiului (Apuseni Mountains, Romania)
A new taxon has been found in the Upper Aptian (Clansayesian)-Albian limestones of Pădurea Craiului (Northern Apuseni Mountains). It is the second representative of the genus Zittelina identified in deposits older than the Cenozoic. This new species differs from Z. hispanica—described from Hauterivian deposits—for its axial cavity is narrower (with proportionally longer laterals and a lower d/D ratio) and the median part of the laterals are
Read moreRemarks on the Permian dasycladalean alga Sinoporella leei Yabe, 1949
Sinoporella leei was first described and illustrated by Yabe in 1949 as a new species and was ascribed to a new subgenus of the genus Triploporella (Steinmann). This alga was not illustrated again until Mu published 25-years later a photomicrograph of a longitudinal-tangential section. The recent finding of new specimens in Permian strata of the Guangxi region (South China) allows us to better illustrate this alga, and to improve our understanding
Read moreUpper Jurassic and Lower Cretaceous carbonate rocks of the Berdiga Limestone – sedimentation on an onbound platform with volcanic and episodic siliciclastic influx. Biostratigraphy, facies and diagenesis (Kirkaova, Kale-Gümüshane area; NE Turkey).
The Berdiga Limestone (Oxfordian to Barremian; NE-Turkey) was analyzed by a profile of 320 m thickness consisting of well-bedded platform carbonates. The biostratigraphic subdivision is based on calcareous algae and benthic foraminifera. Oxfordian oncolitic, intraclastic packstones and grainstones (fragments of corals) are overlain by crystalline dolomite with ghost textures of intraclasts, ooids and biogenics. Micritic limestones with microbial
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