Počet záznamů: 1

Quantum chemical study of soluble diphenyl-diketo-pyrrolopyrrole derivatives

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    0367291 - UMCH-V 2012 RIV CZ eng M - Část monografie knihy
    Toman, Petr - Weiter, M. - Vala, M.
    Quantum chemical study of soluble diphenyl-diketo-pyrrolopyrrole derivatives.
    MetaCentrum Yearbook 2010. Příbram: CESNET, 2011 - (Křenková, I.; Hanousek, P.; Matyska, L.), s. 75-81. ISBN 978-80-904689-3-1
    Grant CEP: GA ČR(CZ) GAP205/10/2280; GA MŠk MEB051010
    Výzkumný záměr: CEZ:AV0Z40500505
    Klíčová slova: diphenyl-diketo-pyrrolopyrrole * quantum chemical calculation * molecular conformation
    Kód oboru RIV: BM - Fyzika pevných látek a magnetismus
    https://www.metacentrum.cz/export/sites/metacentrum/cs/about/results/yearbooks/Rocenka2010_web.pdf https://www.metacentrum.cz/export/sites/metacentrum/cs/about/results/yearbooks/Rocenka2010_web.pdf

    Newly synthesized diphenyl-diketo-pyrrolopyrroles possessing electron-donating or withdrawing groups were characterized by means of quantum chemical methods. Some of these derivatives were N-alkylated on the central unit in order to increase their solubility. It was found that the most important parameter governing absorption and luminescence is the effective extent of the conjugation, which is deeply wedded with the planarity of the molecular conformation. Unlike N-alkylation leading to significant phenyl ring turns, substitution of either electron-donating or withdrawing groups breaks the molecule planarity only slightly. The main effect of the substitution of electron-donating groups is a hyperchromic and bathochromic shift in absorption spectra. This finding suggests electron-accepting character of the central unit. However, it should be noted that N-alkylation reduces this effect.
    Trvalý link: http://hdl.handle.net/11104/0202027