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Szablewski M, Thompson RL, Pålsson LO. Modulated Fluorescence in LB Films Based on DADQs-A Potential Sensing Surface? MOLECULES (BASEL, SWITZERLAND) 2022; 27:molecules27123893. [PMID: 35745015 PMCID: PMC9229250 DOI: 10.3390/molecules27123893] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/05/2022] [Revised: 06/01/2022] [Accepted: 06/13/2022] [Indexed: 11/16/2022]
Abstract
Novel fluorescent Langmuir-Blodgett (LB) films have been constructed from three different amphiphilic dicynaoquinodimethanes (DADQs). The DADQs varied in functional group structure, which had an impact on the LB film structure and the fluorescence properties. As the fluorescence of DADQs competes with non-radiative decay (conformational change), the packing and/or free volume in the LB film will influence the average fluorescence lifetime and integrated intensity. The pristine (blank) LB films were then exposed to a selection of non-fluorescent target analytes (some with environmental relevance) and the fluorescence was measured and analyzed relative to the pristine LB film. Exposure of the LB films to selected target analytes results in a modulation of the fluorescence, both with respect to average fluorescence lifetime and integrated intensity. The modulation of the fluorescence is different for different DADQ LB films and can be attributed to restricted non-radiative decays or charge transfer reactions between target analyte and DADQ LB film. The response from the DADQ LB films shows that these systems can be developed into sensing surfaces based on fluorescence measurements.
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Affiliation(s)
| | | | - Lars-Olof Pålsson
- Department of Chemistry, Durham University, Durham DH1 3LE, UK;
- Correspondence: ; Tel.: +44-(0)191-3342135
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Jiménez J, Prieto-Montero R, Serrano S, Stachelek P, Rebollar E, Maroto BL, Moreno F, Martinez-Martinez V, Pal R, García-Moreno I, de la Moya S. BINOL blocks as accessible triplet state modulators in BODIPY dyes. Chem Commun (Camb) 2022; 58:6385-6388. [PMID: 35543210 DOI: 10.1039/d2cc00991a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
BINOL moieties of different electronic demand are useful blocks for enabling the photo-production and modulation of triplet excited states in readily-accesible BINOL-based O-BODIPY dyes from standard F-BODIPY precursors. The rapid and rational development of smarter triplet-enabling BODIPY dyes on the basis of this strategy (e.g., TADF biomarker 4a or room temperature phosphor 4g) paves the way for advancing photonic applications based on organic triplet photosensitizers.
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Affiliation(s)
- Josué Jiménez
- Departamento de Química Orgánica, Facultad de Ciencias Químicas, Universidad Complutense de Madrid, Ciudad Universitaria s/n, 28040, Madrid, Spain.
| | - Ruth Prieto-Montero
- Departamento de Química Física, Universidad del País Vasco-EHU, Apartado 644, 48080, Bilbao, Spain
| | - Sergio Serrano
- Departamento de Química Orgánica, Facultad de Ciencias Químicas, Universidad Complutense de Madrid, Ciudad Universitaria s/n, 28040, Madrid, Spain.
| | - Patrycja Stachelek
- Department of Chemistry, Durham University, Road, Durham DH1 3LE, Durham, UK
| | - Esther Rebollar
- Departamento de Sistemas de Baja Dimensionalidad, Superficies y Materia Condensada, Instituto de Química Física "Rocasolano", C.S.I.C., Serrano 119, 28006 Madrid, Spain.
| | - Beatriz L Maroto
- Departamento de Química Orgánica, Facultad de Ciencias Químicas, Universidad Complutense de Madrid, Ciudad Universitaria s/n, 28040, Madrid, Spain.
| | - Florencio Moreno
- Departamento de Química Orgánica, Facultad de Ciencias Químicas, Universidad Complutense de Madrid, Ciudad Universitaria s/n, 28040, Madrid, Spain.
| | | | - Robert Pal
- Department of Chemistry, Durham University, Road, Durham DH1 3LE, Durham, UK
| | - Inmaculada García-Moreno
- Departamento de Sistemas de Baja Dimensionalidad, Superficies y Materia Condensada, Instituto de Química Física "Rocasolano", C.S.I.C., Serrano 119, 28006 Madrid, Spain.
| | - Santiago de la Moya
- Departamento de Química Orgánica, Facultad de Ciencias Químicas, Universidad Complutense de Madrid, Ciudad Universitaria s/n, 28040, Madrid, Spain.
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Smith PO, Black DJ, Pal R, Avó J, Dias FB, Linthwaite VL, Cann MJ, Pålsson LO. Applying TADF Emitters in Bioimaging and Sensing-A Novel Approach Using Liposomes for Encapsulation and Cellular Uptake. Front Chem 2021; 9:743928. [PMID: 34540809 PMCID: PMC8440804 DOI: 10.3389/fchem.2021.743928] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2021] [Accepted: 08/16/2021] [Indexed: 11/15/2022] Open
Abstract
A new method for facilitating the delivery, uptake and intracellular localisation of thermally activated delayed fluorescence (TADF) complexes was developed. First, confinement of TADF complexes in liposomes was demonstrated, which were subsequently used as the delivery vehicle for cellular uptake. Confocal fluorescence microscopy showed TADF complexes subsequently localise in the cytoplasm of HepG2 cells. The procedures developed in this work included the removal of molecular oxygen in the liposome preparation without disrupting the liposome structures. Time-resolved fluorescence microscopy (point scanning) showed initial prompt fluorescence followed by a weak, but detectable, delayed fluorescence component for liposomal TADF internalised in HepG2 cells. By demonstrating that it is possible to deliver un-functionalised and/or unshielded TADF complexes, a sensing function for TADFs, such as molecular oxygen, can be envisaged.
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Affiliation(s)
- Poppy O Smith
- Department of Chemistry, Durham University, Durham, United Kingdom
| | - Dominic J Black
- Department of Chemistry, Durham University, Durham, United Kingdom
| | - Robert Pal
- Department of Chemistry, Durham University, Durham, United Kingdom
| | - João Avó
- IBB-Institute for Bioengineering and Biosciences, Instituto Superior Técnico, Universidade de Lisboa, Lisboa, Portugal
| | - Fernando B Dias
- Department of Physics, Durham University, Durham, United Kingdom
| | | | - Martin J Cann
- Department of Biosciences, Durham University, Durham, United Kingdom
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Reo YJ, Jun YW, Cho SW, Jeon J, Roh H, Singha S, Dai M, Sarkar S, Kim HR, Kim S, Jin Y, Jung YL, Yang YJ, Ban C, Joo J, Ahn KH. A systematic study on the discrepancy of fluorescence properties between in solutions and in cells: super-bright, environment-insensitive benzocoumarin dyes. Chem Commun (Camb) 2020; 56:10556-10559. [DOI: 10.1039/d0cc03586f] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
The benzocoumarins show distinctive emission behaviour from some commonly-used dyes in organic, aqueous buffer, and cellular media, which compels us to recognize the cellular environment as the third space for fluorophores.
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