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https://hdl.handle.net/10316/41708
Title: | Insights into the Photophysics and Supramolecular Organization of Congo Red in Solution and the Solid State | Authors: | Costa, Ana L. Gomes, Ana C. Pillinger, Martyn Gonçalves, Isabel S. Pina, João Seixas de Melo, J. Sérgio |
Issue Date: | 2017 | Project: | Fundação para a Ciência e a Tecnologia. Grant Numbers: PEst-OE/QUI/UI0313/2014 Fundação para a Ciência e a Tecnologia. Grant Numbers: FCOMP-01-0124-FEDER-029779 Fundação para a Ciência e a Tecnologia. Grant Numbers: PTDC/QEQ-SUP/1906/2012 Fundação para a Ciência e a Tecnologia. Grant Numbers: POCI-01-0145-FEDER-007679 Fundação para a Ciência e a Tecnologia. Grant Numbers: UID/CTM/50011/2013 Fundação para a Ciência e a Tecnologia. Grant Numbers: SFRH/BD/88806/2012 Fundação para a Ciência e a Tecnologia. Grant Numbers: SFRH/BPD/108541/2015 Fundação para a Ciência e a Tecnologia. Grant Numbers: SFRH/BPD/108469/2015 |
Serial title, monograph or event: | ChemPhysChem | Volume: | 18 | Issue: | 5 | Abstract: | Steady-state and time-resolved absorption and fluorescence measurements are reported for Congo Red (CR) in aqueous and dimethylsulfoxide (DMSO) solutions. The very low fluorescence quantum yield (≈10(-4) ) for CR in dilute solutions together with the absence of a triplet state indicates that internal conversion is the dominant deactivation route with more than 99.99 % of the quanta loss (attributed to the energy gap law for radiationless transitions). Although no direct evidence for trans-cis photoisomerization was obtained from absorption or fluorescence data, the global analysis of fs-transient absorption data indicates the presence of a photoproduct with a lifetime of ≈170 ps that is suggested to be associated with such a process. Spectral data for more concentrated CR solutions indicate the presence of oblique or twisted J-type aggregates. These results are compared with spectra for CR in the solid state (sodium salt) and intercalated in a layered double hydroxide via a one-step co-precipitation route. Powder XRD and electronic spectral data for the nanohybrid indicate that the CR guest molecules are intercalated as a monolayer consisting of slipped cofacial J-type aggregates. | URI: | https://hdl.handle.net/10316/41708 | DOI: | 10.1002/cphc.201601236 | Rights: | embargoedAccess |
Appears in Collections: | FCTUC Química - Artigos em Revistas Internacionais |
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File | Description | Size | Format | |
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ChemPhysChem_v1_rev_JSSM_post_print.pdf | 8.6 MB | Adobe PDF | View/Open |
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