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Applications of Spectroscopy in Molecules
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Applications of Spectroscopy in Molecules

A special issue of Molecules (ISSN 1420-3049). This special issue belongs to the section "Applied Chemistry".

Deadline for manuscript submissions: closed (29 February 2024) | Viewed by 7330

Special Issue Editors

Dr. Jiangbo Yu

E-Mail Website
Guest Editor
Department of Chemistry, University of Washington, Seattle, WA 98195-4550, USA
Interests: preparation of nanomaterials of metal complexes and conjugated polymers; photophysics study on the conjugated polymer nanoparticles and metal-complex nanoparticles and their application as sensors in biology science and technology; probing complex biological systems with the fluorescent nanoparticles based on the single molecule fluorescence microscopy
Dr. Jicheng Zhang

E-Mail Website
Guest Editor
Department of Chemistry, University of Washington, Seattle, WA 98195-4550, USA
Interests: synthesis; purification and characterization of organic compounds and polymers; microwave reactions; preparation of nanoparticles; bioconjugation; sensors; cell culture and super-resolution imaging
Dr. Steven Xu Wu

E-Mail Website
Guest Editor
Department of Chemistry, University of South Dakota, Vermillion, SD 57069, USA
Interests: nanomaterials; bioimaging; biosensing; in vitro; in vivo; drug delivery
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Conjugated polymers have excellent chemical and optical properties. Recently, conjugated polymers have been widely applied in various optoelectronic devices thanks to their abundant absorption spectrum and semiconducting performance. The good fluorescence properties and low toxicity of polymers also enable them to have a wide range of applications in the biological and healthcare fields. When conjugated polymers are blended with other organic or inorganic materials to fabricate thin films, they can show excellent performances in organic solar cells and in electroluminescent and field effect transistor devices. When conjugated polymers are prepared as nanoparticles (<100 nm, especially <30 in diameter), they can be widely used for bioimaging, sensing and detection, drug delivery and therapy due to their exceptional optical properties, structural diversity, ease of surface modification and biocompatibility. When conjugated polymers are molded to have water-soluble properties, they can also be widely used in biological applications because of their natural photophysical properties. The purpose of this Special Issue is to serve as a fascinating collection of original research and review articles on recent advances in the field of applications of spectroscopy in conjugated polymers. Submissions may include, but are not limited to: a) the synthesis of novel conjugated polymers with good optical properties for various applications based on their spectroscopy; b) the fabrication and optimization of devices based on conjugated polymers, such as organic solar cells, electroluminescence, field effect transistors, organic resistive memory devices and photoresistors; c) flexible devices based on the optical properties of conjugated polymers; d) polymer nanoparticles applied as (bio)sensors for bio-imaging based on their fluorescence or/and photoacoustic properties and for photodynamic and photothermal therapy; e) water-soluble conjugated polymers applied as (bio)sensors for bioimaging, photodynamic disinfection or photodynamic anticancer activity.

Dr. Jiangbo Yu
Dr. Jicheng Zhang
Dr. Steven Wu
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. Molecules 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

  • conjugated polymers
  • water-soluble polymers
  • polymer nanoparticles
  • optoelectronic devices
  • flexible devices
  • (bio)sensors
  • bioimaging
  • cancer therapy

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Published Papers (4 papers)

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Research

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18 pages, 6578 KiB  
Article
Influence of Ligand Environment Stoichiometry on NIR-Luminescence Efficiency of Sm3+, Pr3+ and Nd3+ Ions Coordination Compounds
by Trofim Polikovskiy, Vladislav Korshunov, Mikhail Metlin, Viktoria Gontcharenko, Darya Metlina, Nikolay Datskevich, Mikhail Kiskin, Yury Belousov, Alisia Tsorieva and Ilya Taydakov
Molecules 2023, 28(15), 5892; https://doi.org/10.3390/molecules28155892 - 5 Aug 2023
Cited by 2 | Viewed by 1333
Abstract
Six new complexes of the ligand HQcy (-4-(cyclohexanecarbonyl)-5-methyl-2-phenyl-2,4-dihydro-3H-pyrazol-3-one) and Ln3+ ions with emission in the near-infrared (Nd3+) or visible and near-infrared (Sm3+, Pr3+) spectral regions were synthesized and characterized using various methods, including single crystal [...] Read more.
Six new complexes of the ligand HQcy (-4-(cyclohexanecarbonyl)-5-methyl-2-phenyl-2,4-dihydro-3H-pyrazol-3-one) and Ln3+ ions with emission in the near-infrared (Nd3+) or visible and near-infrared (Sm3+, Pr3+) spectral regions were synthesized and characterized using various methods, including single crystal X-ray diffraction. The study demonstrated that both tris complexes [LnQcy3(H2O)(EtOH)] and tetrakis-acids [H3O][LnQcy4] can be synthesized by varying the synthetic conditions. The photochemical properties of the complexes were investigated experimentally and theoretically using various molecular spectroscopy techniques and Judd–Ofelt theory. The objective was to quantitatively and qualitatively disclose the influence of complex stoichiometry on its luminescence properties. The study showed that the addition of an extra ligand molecule (in the tetrakis species) increased molar extinction by up to 2 times, affected the shape of photoluminescence spectra, especially of the Pr3+ complex, and increased the quantum yield of the Sm3+ complex by up to 2 times. The results obtained from this study provide insights into the luminescent properties of lanthanide coordination compounds, which are crucial for the design and development of novel photonic materials with tailored photophysical properties. Full article
(This article belongs to the Special Issue Applications of Spectroscopy in Molecules)
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14 pages, 1880 KiB  
Article
Investigation of the Origin of High Photoluminescence Quantum Yield in Thienyl-S,S-dioxide AIEgens Oligomers by Temperature Dependent Optical Spectroscopy
by Marco Anni
Molecules 2023, 28(13), 5161; https://doi.org/10.3390/molecules28135161 - 1 Jul 2023
Viewed by 1242
Abstract
The development of organic molecules showing high photoluminescence quantum yield (PLQY) in solid state is a fundamental step for the implementation of efficient light emitting devices. In this work the origin of the high PLQY of two trimers and two pentamers having one [...] Read more.
The development of organic molecules showing high photoluminescence quantum yield (PLQY) in solid state is a fundamental step for the implementation of efficient light emitting devices. In this work the origin of the high PLQY of two trimers and two pentamers having one central thiophene-S,S-dioxide unit and two and four lateral thiophene or phenyl groups, respectively, is investigated by temperature dependent photoluminescence and time resolved photoluminescence measurements. The experimental results demonstrate that the molecules with lateral phenyl rings show higher PLQY due to a weaker coupling with intramolecular vibrations—related to variations in the radiative and non-radiative decay rates—and indicate different molecular rigidity as the main factors affecting the PLQY of this class of molecules. Full article
(This article belongs to the Special Issue Applications of Spectroscopy in Molecules)
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14 pages, 3440 KiB  
Article
A Target-Triggered Emission Enhancement Strategy Based on a Y-Shaped DNA Fluorescent Nanoprobe with Aggregation-Induced Emission Characteristic for microRNA Imaging in Living Cells
by Zhe Chen, Zhuoyi Wang, Yihua Yuan, Bo Liu, Jiangbo Yu, Zhiwen Wei and Keming Yun
Molecules 2023, 28(5), 2149; https://doi.org/10.3390/molecules28052149 - 24 Feb 2023
Cited by 1 | Viewed by 1957
Abstract
DNA self-assembled fluorescent nanoprobes have been developed for bio-imaging owing to their high resistance to enzyme degradation and great cellular uptake capacity. In this work, we designed a new Y-shaped DNA fluorescent nanoprobe (YFNP) with aggregation-induced emission (AIE) characteristic for microRNA imaging in [...] Read more.
DNA self-assembled fluorescent nanoprobes have been developed for bio-imaging owing to their high resistance to enzyme degradation and great cellular uptake capacity. In this work, we designed a new Y-shaped DNA fluorescent nanoprobe (YFNP) with aggregation-induced emission (AIE) characteristic for microRNA imaging in living cells. With the modification of the AIE dye, the constructed YFNP had a relatively low background fluorescence. However, the YFNP could emit a strong fluorescence due to the generation of microRNA-triggered AIE effect in the presence of target microRNA. Based on the proposed target-triggered emission enhancement strategy, microRNA-21 was detected sensitively and specifically with a detection limit of 122.8 pM. The designed YFNP showed higher bio-stability and cell uptake than the single-stranded DNA fluorescent probe, which has been successfully applied for microRNA imaging in living cells. More importantly, the microRNA-triggered dendrimer structure could be formed after the recognition of target microRNA, achieving a reliable microRNA imaging with a high spatiotemporal resolution. We expect that the proposed YFNP will become a promising candidate for bio-sensing and bio-imaging. Full article
(This article belongs to the Special Issue Applications of Spectroscopy in Molecules)
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Review

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34 pages, 16116 KiB  
Review
Conjugated Polymeric Materials in Biological Imaging and Cancer Therapy
by Qinbin Zheng, Zhuli Duan, Ying Zhang, Xinqi Huang, Xuefan Xiong, Ang Zhang, Kaiwen Chang and Qiong Li
Molecules 2023, 28(13), 5091; https://doi.org/10.3390/molecules28135091 - 29 Jun 2023
Cited by 4 | Viewed by 2247
Abstract
Conjugated polymers (CPs) have attracted much attention in the fields of chemistry, medicine, life science, and material science. Researchers have carried out a series of innovative researches and have made significant research progress regarding the unique photochemical and photophysical properties of CPs, expanding [...] Read more.
Conjugated polymers (CPs) have attracted much attention in the fields of chemistry, medicine, life science, and material science. Researchers have carried out a series of innovative researches and have made significant research progress regarding the unique photochemical and photophysical properties of CPs, expanding the application range of polymers. CPs are polymers formed by the conjugation of multiple repeating light-emitting units. Through precise control of their structure, functional molecules with different properties can be obtained. Fluorescence probes with different absorption and emission wavelengths can be obtained by changing the main chain structure. By modifying the side chain structure with water-soluble groups or selective recognition molecules, electrostatic interaction or specific binding with specific targets can be achieved; subsequently, the purpose of selective recognition can be achieved. This article reviews the research work of CPs in cell imaging, tumor diagnosis, and treatment in recent years, summarizes the latest progress in the application of CPs in imaging, tumor diagnosis, and treatment, and discusses the future development direction of CPs in cell imaging, tumor diagnosis, and treatment. Full article
(This article belongs to the Special Issue Applications of Spectroscopy in Molecules)
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