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    Wyświetlanie 1-3 z 3
    Tytuł:
    Zapis geochemiczny wymierania K/T świadectwem katastrofy kosmicznej
    Geochemical record of K/T extinction certificate of cosmic catastrophe
    Autorzy:
    Brachaniec, Tomasz
    Powiązania:
    https://bibliotekanauki.pl/articles/1032930.pdf
    Data publikacji:
    2012
    Wydawca:
    Polskie Towarzystwo Meteorytowe
    Tematy:
    Alvarez
    Central Valley of Vistula
    K/T boundary
    geochemical anomalies
    iridium
    platinum elements
    Opis:
    The most important event in the study causes of K/T extinction became Alvarez results of 1980. They were the first, by examining the position in Gubbio and Stevns Klint, suggested a link between high values of the platinum elements in the sediment and the extinction 65 million years ago. For a thorough analysis of the geochemical anomalies is necessary continuous sedimentary record on the K/T boundary. Because of the stratigraphic gap in the Central Valley of Vistula iridium content test results were inaccurate. In 2008 discovered the first complete record of iridium anomalies in eastern Poland, in Lechówka quarry.
    Źródło:
    Acta Societatis Metheoriticae Polonorum; 2012, 3; 17-29
    2080-5497
    Pojawia się w:
    Acta Societatis Metheoriticae Polonorum
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    C,N-cyklometalowane kompleksy irydu(III) : wydajne emitery fosforescencyjne dla organicznych diod elektroluminescencyjnych (OLED). Cz. 1 i 2
    C,N-cyclometalated iridium(III) complexes : efficient phosphorescent emitters for organic electroluminescent diodes (OLED). Part 1 and 2
    Autorzy:
    Orwat, Bartosz
    Kownacki, Ireneusz
    Powiązania:
    https://bibliotekanauki.pl/articles/1413294.pdf
    Data publikacji:
    2021
    Wydawca:
    Polskie Towarzystwo Chemiczne
    Tematy:
    emitery fosforescencyjne
    diody elektroluminescencyjne
    kompleksy irydu(III)
    phosphorescent emitters
    light-emitting diodes
    iridium(III) complexes
    Opis:
    Organic electroluminescent panels have been widely available on the commercial market for several years, in the form of screens used in mobile phones, tablets, and TV sets. The display panels are produced in RGB technology, in which iridium(III) coordination compounds act as phosphorescent emitters of red and green light. Because of their high emission quantum efficiency and stability, the emitters containing 2-phenylpyridinato ligands and their derivatives have proved to be particularly useful. An interesting issue was the contrast between an extensive state of knowledge on the abovementioned compounds and a poor state of knowledge on analogous iridium(III) complexes equipped with benzo[h]quinolinato ligands. Application of the latter seemed interesting because of the similar size of benzo[h]quinoline and 2-phenylpyridine coordination pockets, but much more rigid structure and a greater degree of conjugation of the former, which could have a significant impact on the properties of complexes equipped with this type of ligand. Regarding to the above, this dissertation concerns the subject of the design and synthesis of new iridium(III) coordination compounds equipped with a benzo[h]quinoline motif, as well as the analysis of the structural changes impact on the photophysical, electroluminescent, thermal, electrochemical and spectroscopic properties of selected classes of compounds targeted for the application in OLED technology. Accordingly, the article presents the results of studies on two classes of heteroleptic of C,N-cyclometalated iridium(III) complexes, namely, of the salt type with the general formula [Ir(bzq)2(N^N)]+A-, stabilized by structurally different N,N-donating ligands, as well as neutral coordination compounds of the type [Ir(bzq)2(N^O)], bearing N,O-donating ß-ketoiminato ligands in the structure equipped with aryl moieties of various structure. The work included research on the determination of the correlation between the structure of ancillary ligand introduced into the coordination sphere of the metal and the above-mentioned properties. Additionally, based on the results of quantum-chemical calculations, work was undertaken to develop synthetic pathways enabling the incorporation to the C,N-cyclometalating benzo[h]quinoline ligand of substituents characterized by different stereo-electronic properties, enabling the modification of the emission parameters of the target complexes. In the next phase of research, the functionalized precursors of the bzq ligand were successfully used in the synthesis of binuclear complexes, key reagents in the preparation of corresponding mononuclear iridium coordination derivatives with electroluminescent properties.
    Źródło:
    Wiadomości Chemiczne; 2021, 75, 1-2; 163-231
    0043-5104
    2300-0295
    Pojawia się w:
    Wiadomości Chemiczne
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Dańskie amonity - obecny stan wiedzy i perspektywy badań
    Danian ammonites - The present state of knowledge and perspectives for future research
    Autorzy:
    Machalski, M.
    Jagt, J.W.M.
    Heinberg, C.
    Landman, N.H.
    Hakansson, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/2074714.pdf
    Data publikacji:
    2009
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    masa wymarła
    amonity
    odsłonięcia K-Pg
    relikt
    odrodzenie
    uderzenie
    anomalia irydowa
    Maastricht
    Dania
    Holandia
    New Jersey
    ammonites
    K-Pg boundary
    mass extinctions
    survival
    recovery
    impact
    iridium anomaly
    Danian
    Denmark
    Opis:
    To date, the strongest arguments for ammonite survival into the Danian (earliest Paleogene) are based on material from the lower Danian Cerithium Limestone at Stevns Klint (Denmark), where ammonites occur above a clay layer with impact products at its base, the latter defining the Cretaceous-Paleogene (K-Pg) boundary. The best-preserved specimen is filled with Danian sediment rather than with Maastrichtian chalk, which would be expected had this been reworked material. Arguments for ammonite survival into the Danian have also been provided by specimens from the sporomorph and calcareous nannoplankton-dated lowermost Danian strata of Meerssen Member unit IVf-7, the Netherlands. Their good preservation indicates that they were not subject to any significant transport or redeposition. However, there are no unequivocal impact-related signatures in unit IVf-7, except for rare shocked quartz grains, recorded from burrows at its base. Sections in the Manasquan Basin, New Jersey, USA, provide equivocal data as far as the problem of ammonite survival into the Danian is concerned. At the top of the Tinton Formation there is a Pinna layer replete with fossils, inclusive of ammonites. Their exquisite preservation and occurrence in monospecific clusters rule out redeposition. The Pinna layer contains exclusively late Maastrichtian microfossils. However, a clear iridium anomaly has been noted at its base. Either the New Jersey ammonites survived the K-Pg event for a short time or the iridium is not in situ due to post-depositional repositioning by percolating water. Planned work is to focus on: 1) a detailed centimetre by centimetre sampling of some Cerithium Limestone basins in Denmark in search of additional ammonite material, 2) palaeontological and taphonomic analysis of ammonites and search for impact signatures in unit IVf-7 in the Netherlands, and 3) geochemical study of the iridium anomaly in New Jersey in order to determine whether its position in respect to the ammonite-bed is original or secondary.
    Źródło:
    Przegląd Geologiczny; 2009, 57, 6; 486-493
    0033-2151
    Pojawia się w:
    Przegląd Geologiczny
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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