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Title: | Tuning the Behavior of a Hydrotalcite-Supported Sulfonated Bithiophene from Aggregation-Caused Quenching to Efficient Monomer Luminescence | Authors: | Delgado Pinar, Estefanía Costa, Ana L. Gonçalves, Isabel S. Pineiro, Marta Pillinger, Martyn Melo, J. Sérgio Seixas de |
Issue Date: | 2021 | Publisher: | ACS American Chemical Society | Project: | This work was carried out with the support of Centro de Química de Coimbra [FCT (Fundação para a Ciência e a Tecnologia) Ref Nos. UIDB/00313/2020 and UIDP/00313/ 2020], CICECO - Aveiro Institute of Materials [FCT Ref Nos. UIDB/50011/2020 and UIDP/50011/2020], the COMPETE 2020 Operational Thematic Program for Competitiveness and Internationalization (Project “Hylight”, 02/SAICT/2017, PTDC/QUI-QFI/31625/2017), the CENTRO 2020 Regional Operational Programme (Project “SASCOT”, 02/SAICT/ 2017, PTDC/QUI-QOR/28031/2017), cofinanced by national funds through the FCT/MCTES and the European Union through the European Regional Development Fund (ERDF) under the Portugal 2020 Partnership Agreement. The research leading to these results has received funding from Laserlab-Europe (Grant Agreement No. 284464, EC’s Seventh Framework Programme). E.D.-P. thanks the “Concurso de Estímulo ao Emprego Científico” for the Junior Contract CEECIND/04136/2018. The NMR spectrometers of the University of Aveiro are part of the National NMR Network (PTNMR) and are partially supported by Infrastructure Project No. 022161 (cofinanced by the EDRF through COMPETE 2020, POCI and PORL, and the FCT through PIDDAC). NMR data collected at the UC-NMR facility are supported in part by the EDRF through the COMPETE Program and by national funds from the FCT through Grants RECI/QEQ-QFI/0168/2012 and CENTRO-07-CT62- FEDER-002012 and also through support to Rede Nacional de Ressonância Magnética Nuclear (RNRMN) and to Coimbra Chemistry Centre through Grant UID/QUI/ 00313/2019. | Serial title, monograph or event: | The Journal of Physical Chemistry C | Volume: | 125 | Issue: | 15 | Abstract: | The synthesis, electronic spectral, and photophysical properties of a new bithiophene derivative, (2,2′- bithiophene)-3,5,5′-trisulfonic acid, α2-SO3H, were investigated in organic or aqueous solution, in neat oil form, and in the solid state by cointercalation with different amounts of the surfactant 1- heptanesulfonate (HS) into a layered double hydroxide (LDH). In solution the fluorescence quantum yield (ϕF) of α2-SO3H increases by 1 order of magnitude when compared to the unsubstituted bithiophene (α2) counterpart. However, the most dramatic change is obtained when α2-SO3H is incorporated with HS into a Zn,Al-LDH, where values of ϕF up to 58% are obtained in comparison with values of 4% for neat α2-SO3H (as an oil) and 2% for an LDH containing only α2-SO3H. In the solid state (LDH), in addition to the monomeric form of α2-SO3H, H- and other types of aggregates are present, which are found to be dependent on the percentage HS content. Time-resolved fluorescence studies further rationalize this behavior with single and double exponential decays mirroring the contributions of monomers and aggregates. The study validates a strategy of increasing fluorescence in the solid state by introduction of electrodonating groups and isolation of the α2-SO3H units within the LDH structure with an appropriate surfactant (HS). | URI: | https://hdl.handle.net/10316/107460 | ISSN: | 1932-7447 1932-7455 |
DOI: | 10.1021/acs.jpcc.1c00240 | Rights: | embargoedAccess |
Appears in Collections: | I&D CQC - Artigos em Revistas Internacionais |
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