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DC Field | Value | Language |
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dc.contributor.author | Zammit, Ramon | - |
dc.contributor.author | Pappova, Maria | - |
dc.contributor.author | Zammit, Esther | - |
dc.contributor.author | Gabarretta, John | - |
dc.contributor.author | Magri, David C. | - |
dc.date.accessioned | 2021-03-08T14:29:00Z | - |
dc.date.available | 2021-03-08T14:29:00Z | - |
dc.date.issued | 2015 | - |
dc.identifier.citation | Zammit, R., Pappova, M., Zammit, E., Gabarretta, J., & Magri, D. C. (2015). 1, 3, 5-Triarylpyrazolines—pH-driven off-on-off molecular logic devices based on a “receptor1-fluorophore-spacer-receptor2” format with internal charge transfer (ICT) and photoinduced electron transfer (PET) mechanisms. Canadian Journal of Chemistry, 93(2), 199-206. | en_GB |
dc.identifier.uri | https://www.um.edu.mt/library/oar/handle/123456789/70643 | - |
dc.description.abstract | The excited state photophysical properties of the 1,3,5-triarylpyrazolines 1–4 were studied in methanol and 1:1 (v/v) methanol–water, as well as 1:4 (v/v) methanol–water and water by fluorescence spectroscopy. The molecules 2–4 incorporate a “receptor1-fluorophore-spacer-receptor2” format while 1 is a reference compound based on a “fluorophore-receptor1” design. The molecular probes operate according to photoinduced electron transfer (PET) and internal charge transfer (ICT) processes. At basic and neutral pHs, 2–4 are essentially nonfluorescent due to PET from the electron-donating dimethylamino moiety appended on the 5-phenyl ring to the excited state of the 1,3,5-triarylpyrazoline fluorophore. At proton concentrations of 10−3 mol/L, the dimethylamino unit is protonated resulting in a strong blue fluorescence about 460 nm with significant quantum yields up to 0.54. At acid concentrations above 10−2 mol/L, fluorescence quenching is observed by an ICT mechanism due to protonation of the pyrazoline chromophore. Symmetrical off-on-off fluorescence–pH profiles are observed, spanning six log units with a narrow on window within three pH units. Hence, 2–4 are novel examples of ternary photonic pH sensing molecular devices. | en_GB |
dc.language.iso | en | en_GB |
dc.publisher | Canadian Science Publishing | en_GB |
dc.rights | info:eu-repo/semantics/restrictedAccess | en_GB |
dc.subject | Fluorescence | en_GB |
dc.subject | Charge transfer | en_GB |
dc.subject | Ternary system | en_GB |
dc.title | 1,3,5-triarylpyrazolines - pH-driven off-on-off molecular logic devices based on a “receptor1-fluorophore-spacer-receptor2” format with internal charge transfer (ICT) and photoinduced electron transfer (PET) mechanisms | en_GB |
dc.type | article | en_GB |
dc.rights.holder | The copyright of this work belongs to the author(s)/publisher. The rights of this work are as defined by the appropriate Copyright Legislation or as modified by any successive legislation. Users may access this work and can make use of the information contained in accordance with the Copyright Legislation provided that the author must be properly acknowledged. Further distribution or reproduction in any format is prohibited without the prior permission of the copyright holder | en_GB |
dc.description.reviewed | peer-reviewed | en_GB |
dc.identifier.doi | 10.1139/cjc-2014-0266 | - |
dc.publication.title | Canadian Journal of Chemistry | en_GB |
Appears in Collections: | Scholarly Works - FacSciChe |
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1_3_5_triarylpyrazolines.pdf Restricted Access | 1.54 MB | Adobe PDF | View/Open Request a copy |
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