Počet záznamů: 1
Aggregation and metal-complexation behaviour of THPP porphyrin in ethanol/water solutions as function of pH
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SYSNO ASEP 0489820 Druh ASEP J - Článek v odborném periodiku Zařazení RIV J - Článek v odborném periodiku Poddruh J Článek ve WOS Název Aggregation and metal-complexation behaviour of THPP porphyrin in ethanol/water solutions as function of pH Tvůrce(i) Zannotti, M. (IT)
Giovannetti, R. (IT)
Minofar, Babak (MBU-M) RID, ORCID
Řeha, David (MBU-M) ORCID
Plačková, Lydie (MBU-M)
D'Amato, C.A. (IT)
Rommozzi, E. (IT)
Dudko, H. V. (BY)
Kari, N. (IT)
Minicucci, M. (IT)Zdroj.dok. Spectrochimica Acta Part A-Molecular and Biomolecular Spectroscopy. - : Elsevier - ISSN 1386-1425
Roč. 193, MAR 15 (2018), s. 235-248Poč.str. 14 s. Jazyk dok. eng - angličtina Země vyd. GB - Velká Británie Klíč. slova Porphyrin dyes ; Aggregation ; Binary solvent mixture Vědní obor RIV CE - Biochemie Obor OECD Biochemistry and molecular biology CEP GA15-12816S GA ČR - Grantová agentura ČR LM2015055 GA MŠMT - Ministerstvo školství, mládeže a tělovýchovy Institucionální podpora MBU-M - RVO:61388971 UT WOS 000424962900031 EID SCOPUS 85037990529 DOI 10.1016/j.saa.2017.12.021 Anotace The effect of pH change on 5,10,15,20-Tetrakis(4-hydroxypheny1)-21H,23H-porphine (THPP) with its aggregation as function of water-ethanol mixture was studied with UV-vis, fluorescence, Raman and computational analysis. In neutral pH, THPP was present as free-base and, increasing the water amount, aggregation occurred with the formation of H- and J-aggregates. The aggregation constant and the concentration of dimers were calculated, other information about the dimer aggregation were evaluated by computational study.
In acidic pH, by the insertions of two hydrogens in the porphyrin rings, the porphyrin changed its geometry with a ring deformation confirmed by red-shifted spectrum and quenching in fluorescence, at this low pH, increasing the water amount, the acidic form (THPPH2)(2+) resulted more stable due to a polar environment with stronger interaction by hydrogen bonding.
In basic pH, reached by NH4OH, THPP porphyrin was able to react with alkali metals in order to form sitting-atop complex (M2THPP) confirmed by the typical absorption spectrum of metallo-porphyrin, Raman spectroscopy and by computational analysis.Pracoviště Mikrobiologický ústav Kontakt Eliška Spurná, eliska.spurna@biomed.cas.cz, Tel.: 241 062 231 Rok sběru 2019
Počet záznamů: 1