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Photophysical properties of CdSe quantum dot self-assemblies with zinc phthalocyanines and azaphthalocyanines
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SYSNO ASEP 0392059 Druh ASEP J - Článek v odborném periodiku Zařazení RIV J - Článek v odborném periodiku Poddruh J Článek ve WOS Název Photophysical properties of CdSe quantum dot self-assemblies with zinc phthalocyanines and azaphthalocyanines Tvůrce(i) Suchánek, Jan (UFCH-W) RID, ORCID
Lang, Kamil (UACH-T) SAI, RID, ORCID
Nováková, V. (CZ)
Zimčík, P. (CZ)
Zelinger, Zdeněk (UFCH-W) RID, ORCID
Kubát, Pavel (UFCH-W) RID, ORCID, SAIZdroj.dok. Photochemical & Photobiological Sciences - ISSN 1474-905X
Roč. 12, č. 5 (2013), s. 743-750Poč.str. 8 s. Jazyk dok. eng - angličtina Země vyd. FR - Francie Klíč. slova photodynamic therapy ; fluorescence spectra ; singlet oxygen Vědní obor RIV CF - Fyzikální chemie a teoretická chemie Vědní obor RIV – spolupráce Ústav anorganické chemie - Anorganická chemie CEP GAP208/10/1678 GA ČR - Grantová agentura ČR Institucionální podpora UFCH-W - RVO:61388955 ; UACH-T - RVO:61388980 UT WOS 000318027200005 EID SCOPUS 84876904451 DOI 10.1039/C2PP25348H Anotace The formation of self-assemblies between CdSe quantum dots (QDs) and Zn phthalocyanines (Pc) and azaphthalocyanines (AzaPc) bearing alkylsulfanyl substituents and the photophysical properties of these assemblies were studied using both steady-state and time-resolved luminescence/absorption spectroscopy. The formation of the self-assemblies was accompanied by a blue shift of the Q band of the dyes and by a quenching of the CdSe QDs luminescence. The largest spectral shift of the Q-band was approximately 7 nm and was observed for pentan-3-ylsulfanyl-functionalised phthalocyanine (3). Assuming a 1 : 1 stoichiometry, the calculated binding constant was 4 × 104 M−1. Pc substituted with the bulky tert-butylsulfanyl groups (1) exhibited a smaller shift of the Q band. The quenching of the CdSe QDs luminescence by 1 was more effective than that observed for 3. The results indicated that the luminescence quenching may be due to a photoinduced charge transfer between 1 or 3 and the CdSe QDs. In contrast, the AzaPc (2) with the same substituents as 1 had little effect on the QDs luminescence. For all cases, we found an inefficient resonance energy transfer between the attached dyes and the CdSe QD. The formation of the self-assemblies had negligible effects on the photogeneration of the singlet oxygen, O2(1Δg), that was fully controlled only by the absorption of the light by the macrocycles. Pracoviště Ústav fyzikální chemie J.Heyrovského Kontakt Michaela Knapová, michaela.knapova@jh-inst.cas.cz, Tel.: 266 053 196 Rok sběru 2014
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