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Crystals
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Synthesis and Characterization of Luminescent Molecular Transition Metal and Lanthanide...
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Synthesis and Characterization of Luminescent Molecular Transition Metal and Lanthanide Complexes

A special issue of Crystals (ISSN 2073-4352).

Deadline for manuscript submissions: closed (23 November 2021) | Viewed by 4191

Special Issue Editors

Dr. Wai-Lun Chan

E-Mail Website
Guest Editor
Department of Applied Biology and Chemical Technology, Hong Kong Polytechnic University, Hong Kong, China
Interests: coordination chemistry; organometallic chemistry; luminescent lanthanide organic & inorganic materials; lanthanide-porphyrin spectroscopy; photodynamic therapy; molecular imaging
Dr. Peng Tao

E-Mail Website
Guest Editor
Department of Applied Biology and Chemical Technology, Hong Kong Polytechnic University, Hong Kong 999077, China
Interests: advanced functional materials; luminescent transition-metal complexes; organic semiconductors; π-conjugated compounds; organic electronics
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

In recent decades, luminescent metal complexes, especially transition-metal and lanthanide-based ones, have played a crucial role in the development of photofunctional materials. Luminescent transition-metal and lanthanide complexes have attracted extensive attention, and owing to their diverse structural/molecular design, structural diversity, and rich photophysical properties, they have been widely and wisely used in the fields of photocatalysis, electroluminescence, organic solar cells, organic memory devices, biological sensing and imaging, photodynamic therapy, etc. Synthetic chemists have been able to design and prepare a wide variety of photofunctional metal complexes. Structural studies of these complexes revealed the presence of novel photophysical phenomena, allowing a deeper understanding of the structure–property relationships and extending their potential applications. For example, with a strong spin–orbit coupling effect, phosphorescent transition-metal complexes (e.g., iridium(III), platinum(II)) can be used as triplet emitters to utilize both singlet and triplet excitons to greatly enhance the efficiency of electroluminescence, breaking the upper limit of conventional fluorescent device efficiency; molecular symmetry, on the other hand, can dictate europium(III) complexes’ hypersensitive luminescence properties, which can be utilized in responsive luminescence bioimaging and even thermosensing. Thus, synthetic efforts in this field have produced a large number of luminescent complexes based on transition metals and/or lanthanide ions with rich photophysical properties. This Special Issue on “Synthesis and Characterization of Luminescent Molecular Transition Metal and Lanthanide Complexes” should then serve as a timely status report summarizing and showcasing the fundamental progresses and practical advancements achieved in recent years.

Dr. Wai-Lun Chan
Dr. Peng Tao
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. Crystals is an international peer-reviewed open access monthly 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 2600 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

  • Photofunctional transition metal complexes
  • Photofunctional lanthanide complexes
  • Metal complexes for photocatalysis
  • Metal complexes for optical sensing/imaging and phototherapy
  • Metal complexes for optoelectronics
  • Structure–photophysics relationship

Published Papers (2 papers)

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Research

11 pages, 2847 KiB  
Article
A Novel Phosphorescent Iridium(III) Complex Bearing Formamide for Quantitative Fluorine Anion Detection
by Song Guo, Chaoxiong Guo, Zhao Lu, Linlin Du, Man Gao, Shujuan Liu, Yuanli Liu and Qiang Zhao
Crystals 2021, 11(10), 1190; https://doi.org/10.3390/cryst11101190 - 29 Sep 2021
Cited by 6 | Viewed by 1703
Abstract
Fluorine anion plays a critical role for human health, especially for the teeth and the skeletal system, and a deficiency or excess of fluorine anion will result in various diseases. Thus, the accurate and timely detection of fluorine content is of great importance. [...] Read more.
Fluorine anion plays a critical role for human health, especially for the teeth and the skeletal system, and a deficiency or excess of fluorine anion will result in various diseases. Thus, the accurate and timely detection of fluorine content is of great importance. Herein, a novel and sensitive fluorine probe based on ionic iridium(III) complex using 5-formamide phenanthroline as an ancillary ligand was designed and synthesized rationally. The probe exhibited excellent performance for F− detection in organic solvents. H-bonding between the fluoride and the amide proton was formed, thus changing the photophysical properties of the probe and leading to significant phosphorescence quenching. Nuclear magnetic resonance titration and theoretical calculations were carried out to understand the mechanism in detail. This is the first report of an iridium(III) complex probe for F− detection based on the interaction between formamide and fluorine anion. Full article
(This article belongs to the Special Issue Synthesis and Characterization of Luminescent Molecular Transition Metal and Lanthanide Complexes)
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11 pages, 1708 KiB  
Article
Deep NIR-I Emissive Iridium(III) Complex Bearing D-A Ligand: Synthesis, Photophysical Properties and DFT/TDDFT Calculation
by Jia-Yang Jiang, Zi-Han Xu, Tang Li, Da-Hua Cai, Hui Zhou and Ze-Jing Chen
Crystals 2021, 11(9), 1038; https://doi.org/10.3390/cryst11091038 - 29 Aug 2021
Viewed by 1855
Abstract
Near-infrared (NIR) phosphorescent iridium(III) complexes have been demonstrated to possess photophysical properties superior to those of traditional NIR dyes. However, the NIR emission wavelength is restricted in the range of 700–800 nm. For realizing deeper NIR emission, a novel type of iridium(III) complex [...] Read more.
Near-infrared (NIR) phosphorescent iridium(III) complexes have been demonstrated to possess photophysical properties superior to those of traditional NIR dyes. However, the NIR emission wavelength is restricted in the range of 700–800 nm. For realizing deeper NIR emission, a novel type of iridium(III) complex was designed and synthesized in this work. The main ligand of the iridium(III) complex was constructed using a donor-acceptor structure containing benzothiophene as the donor and quinoxaline as the acceptor. The β-diketone derivative was chosen as the auxiliary ligand owing to its symmetrical structure and p-donating character. The complex exhibits deep NIR-I phosphorescence (764 nm in CH2Cl2, 811 nm in aqueous solution) and broad full width at half maximum (108 nm in CH2Cl2, 154 nm in aqueous solution). Theoretical calculations based on the density function and time-dependent density function were carried out to support the experimental data. Moreover, in vitro biological performance of the complex was determined as well. This work supports the possibility that via a systematic transformation between the D and A units, the photophysical performance of NIR emissive iridium(III) complexes can be greatly improved. Full article
(This article belongs to the Special Issue Synthesis and Characterization of Luminescent Molecular Transition Metal and Lanthanide Complexes)
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