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Fluorescent Polymeric Probes
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Fluorescent Polymeric Probes

A special issue of Polymers (ISSN 2073-4360). This special issue belongs to the section "Polymer Applications".

Deadline for manuscript submissions: closed (31 December 2021) | Viewed by 10702

Special Issue Editors

Prof. Dr. Ugo Caruso

E-Mail Website
Guest Editor
Department of Chemical Sciences, University of Napoli Federico II, 80126 Naples, Italy
Interests: liquid crystals; liquid–crystalline polymers; liquid–crystalline networks; mesomorphic organometallic polymers; dye-sensitized solar cells (DSSC); organic semiconductors; organic fluorescent molecules; metallo-organic fluorescent materials; crystal engineering; crystal structures; optical materials; second-order NLO molecules; dyes and pigments; flurophore/chromophore probes; chemosensor; solid-state emitters; fluorescent dyes
Special Issues, Collections and Topics in MDPI journals
Prof. Dr. Barbara Panunzi

E-Mail Website
Guest Editor
Department of Agriculture, University of Napoli Federico II, 80126 Naples, Italy
Interests: liquid crystals; liquid–crystalline polymers; liquid–crystalline networks; mesomorphic organometallic polymers; dye-sensitized solar cells (DSSC); organic semiconductors; organic fluorescent molecules; metallo-organic fluorescent materials; crystal engineering; crystal structures; optical materials; second-order NLO molecules; dyes and pigments; flurophore/chromophore probes; chemosensor; solid-state emitters; fluorescent dyes
Special Issues, Collections and Topics in MDPI journals
Dr. Rosita Diana

E-Mail Website
Guest Editor
Department of Agriculture, University of Napoli Federico II, 80126 Naples, Italy
Interests: liquid crystals; liquid–crystalline polymers; liquid–crystalline networks; mesomorphic organometallic polymers; dye-sensitized solar cells (DSSC); organic semiconductors; organic fluorescent molecules; metallo-organic fluorescent materials; crystal engineering; crystal structures; optical materials; second-order NLO molecules; dyes and pigments; flurophore/chromophore probes; chemosensor; solid-state emitters; fluorescent dyes

Special Issue Information

Dear colleagues,

The strategic role played by fluorescent polymers is now acknowledged by all.

This class of materials combines the characteristics of polymeric materials (solution processability, large-scale manufacturing, ability to produce flexible layers, tunability of some physical and chemophysical properties) with the electro-optical performance of fluorophore probes.

Thanks to their peculiar properties and processability, fluorescent polymers have been widely used as chemo- and biosensors for pH, temperature, metals, and small organic analytes and as responsive substrates in a wide field of scientific applications, from bioimaging to light-emitting devices.

In this Special Issue, which follows the first issue edited by Dr. Seiichi Uchiyama, we aim to collect the latest and most promising research on the fluorescent polymeric probe. Reviews are welcome.

Prof. Ugo Caruso, Prof. Barbara Panunzi and Dr. Rosita Diana

Guest Editors

Prof. Ugo Caruso
Prof. Barbara Panunzi
Dr. Rosita Diana
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Polymers is an international peer-reviewed open access semimonthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2700 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • photoluminescent polymers
  • fluorescence
  • fluorescent probes
  • chromophore probe
  • polymeric nanoparticles
  • environmental monitoring
  • biological probe
  • optical sensing
  • fluorescence imaging

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Published Papers (3 papers)

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Research

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21 pages, 2677 KiB  
Article
Nonlinear Optical Pigments. Two-Photon Absorption in Crosslinked Conjugated Polymers and Prospects for Remote Nonlinear Optical Thermometry
by Jan K. Zaręba, Marcin Nyk and Marek Samoć
Polymers 2020, 12(8), 1670; https://doi.org/10.3390/polym12081670 - 27 Jul 2020
Cited by 10 | Viewed by 3262
Abstract
Nonlinear optical (NLO) pigments are compounds insoluble in solvents that exhibit phenomena related to nonlinear optical susceptibilities (χ(n) where n = 2,3,...), e.g., two-photon absorption (2PA) which is related to the imaginary part of χ(3). Determination of spectrally-resolved 2PA properties [...] Read more.
Nonlinear optical (NLO) pigments are compounds insoluble in solvents that exhibit phenomena related to nonlinear optical susceptibilities (χ(n) where n = 2,3,...), e.g., two-photon absorption (2PA) which is related to the imaginary part of χ(3). Determination of spectrally-resolved 2PA properties for NLO pigments of macromolecular nature, such as coordination polymers or crosslinked polymers, has long been a challenging issue due to their particulate form, precluding characterizations with standard techniques such as Z-scan. In this contribution, we investigate thus far unknown spectrally-resolved 2PA properties of a new subclass of NLO pigments—crosslinked conjugated polymers. The studied compounds are built up from electron-donating (triphenylamine) and electron-withdrawing (2,2’-bipyridine) structural fragments joined by vinylene (Pol1) or vinyl(4-ethynylphenyl) (Pol2) aromatic bridges. 2PA properties of these polymers have been characterized in broad spectral range by specially modified two-photon excited fluorescence (TPEF) techniques: solid state TPEF (SSTPEF) and internal standard TPEF (ISTPEF). The impact of self-aggregation of aromatic backbones on the 2PA properties of the polymers has been evaluated through extended comparisons of NLO parameters, i.e., 2PA cross sections (σ2) and molar-mass normalized 2PA merit factors (σ2/M) with those of small-molecular model compounds: Mod1 and Mod2. By doing this, we found that the 2PA response of Pol1 and Pol2 is improved 2–3 times versus respective model compounds in the solid state form. Further comparisons with 2PA results collected for diluted solutions of Mod1 and Mod2 supports the notion that self-aggregated structure contributes to the observed enhancement of 2PA response. On the other hand, it is clear that Pol1 and Pol2 suffer from aggregation-caused quenching phenomenon, well reflected in time-resolved fluorescence properties as well as in relatively low values of quantum yield of fluorescence. Accordingly, despite improved intrinsic 2PA response, the effective intensity of two-photon excited emission for Pol1 and Pol2 is slightly lower relative to Mod1 and Mod2. Finally, we explore temperature-resolved luminescence properties under one- (377 nm), two- (820 nm), and three-photon excitation (1020 nm) conditions of postsynthetically Eu3+-functionalized material, Pol1-Eu, and discuss its suitability for temperature sensing applications. Full article
(This article belongs to the Special Issue Fluorescent Polymeric Probes)
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15 pages, 2518 KiB  
Article
Novel Solid-State Emissive Polymers and Polymeric Blends from a T-Shaped Benzodifuran Scaffold: A Comparative Study
by Ugo Caruso, Rosita Diana, Angela Tuzi and Barbara Panunzi
Polymers 2020, 12(3), 718; https://doi.org/10.3390/polym12030718 - 24 Mar 2020
Cited by 3 | Viewed by 2966
Abstract
Two novel polyimines were synthesized from a benzodifuran based diamino monomer and two dialdehydes bearing bulky groups and a flexible spacer. The polymers display tuned luminescence performance according to the presence of half-salen groups. The effect of the intramolecular bond on the emission [...] Read more.
Two novel polyimines were synthesized from a benzodifuran based diamino monomer and two dialdehydes bearing bulky groups and a flexible spacer. The polymers display tuned luminescence performance according to the presence of half-salen groups. The effect of the intramolecular bond on the emission properties were examined. Two model compounds, replicating the same emissive Schiff base cores, were synthetized. From the models, dye-doped blends in the fluorophore/matrix ratio, resembling the polymers, were produced. Amorphous thin films of the covalent polymers and the polymeric blends were obtained by spin-coating technique. The Photoluminescent (PL) response of the different macromolecular systems were qualitatively and quantitatively examined and compared. Full article
(This article belongs to the Special Issue Fluorescent Polymeric Probes)
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Review

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32 pages, 53876 KiB  
Review
Stimuli-Responsive Zinc (II) Coordination Polymers: A Novel Platform for Supramolecular Chromic Smart Tools
by Rosita Diana, Ugo Caruso and Barbara Panunzi
Polymers 2021, 13(21), 3712; https://doi.org/10.3390/polym13213712 - 27 Oct 2021
Cited by 11 | Viewed by 3666
Abstract
The unique role of the zinc (II) cation prompted us to cut a cross-section of the large and complex topic of the stimuli-responsive coordination polymers (CPs). Due to its flexible coordination environment and geometries, easiness of coordination–decoordination equilibria, “optically innocent” ability to “clip” [...] Read more.
The unique role of the zinc (II) cation prompted us to cut a cross-section of the large and complex topic of the stimuli-responsive coordination polymers (CPs). Due to its flexible coordination environment and geometries, easiness of coordination–decoordination equilibria, “optically innocent” ability to “clip” the ligands in emissive architectures, non-toxicity and sustainability, the zinc (II) cation is a good candidate for building supramolecular smart tools. The review summarizes the recent achievements of zinc-based CPs as stimuli-responsive materials able to provide a chromic response. An overview of the past five years has been organised, encompassing 1, 2 and 3D responsive zinc-based CPs; specifically zinc-based metallorganic frameworks and zinc-based nanosized polymeric probes. The most relevant examples were collected following a consequential and progressive approach, referring to the structure–responsiveness relationship, the sensing mechanisms, the analytes and/or parameters detected. Finally, applications of highly bioengineered Zn-CPs for advanced imaging technique have been discussed. Full article
(This article belongs to the Special Issue Fluorescent Polymeric Probes)
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