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Crystals
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Fluorescent Complexes
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Fluorescent Complexes

A special issue of Crystals (ISSN 2073-4352). This special issue belongs to the section "Crystal Engineering".

Deadline for manuscript submissions: closed (15 April 2020) | Viewed by 18847

Special Issue Editor

Dr. Jesús Sanmartín-Matalobos

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Guest Editor
Inorganic Chemistry Department, University of Santiago de Compostela, 15782 Santiago de Compostela, Spain
Interests: supramolecular chemistry; coordination chemistry; single crystal X-ray crystallography; H-bonding; chirality; fluorescence
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Fluorescence spectrometry is a fast, simple and inexpensive method for sample detection and quantification based on enhancement/quenching of its fluorescent intensity. Sensitivity, specificity, wide concentration range and accurate results are remarkable advantages of fluorescence-based methods. There are numerous organic fluorophores available, but most of them, as is the case of fluorescein and rhodamine, have fluorescence lifetimes of less than 10 nanoseconds. The discovery of metal complexes with long lifetimes as well as a high chemical and photochemical stability under physiological conditions has attracted a lot of attention to investigate their light emission properties. Since the source of complexes fluorescence is the metal-to-ligand charge-transfer state, a careful selection of metals and ligands can give rise to complexes with favourable light emission properties. Specific applications in analytical, biological and medical research boost investigation on the development of new metal complexes-based probes.

We invite researchers to contribute to this Special Issue on fluorescent complexes, which is intended to serve as a unique multidisciplinary forum covering the current progress in the synthesis, characterization, emission properties and applications of fluorescent complexes.

The potential topics include but are not limited to the following:

-    Synthesis and single crystal X-ray determination of new fluorescent complexes
-    X-ray determination and fluorescence emission properties of metal complexes
-    Exploitation of the remarkable properties of metal complexes in various existent and emerging  applications
-    Structure- light emission properties relationship of new metal complexes based probes
-    Applications in analytical, biological and medical research of new metal complexes based probes 

Prof. Dr. Jesús Sanmartín-Matalobos
Guest Editor

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 2100 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

  • Single crystal X-ray
  • Metal complexes
  • Fluorescence properties
  • Complex probes
  • Long lifetime probes

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Published Papers (4 papers)

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Research

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13 pages, 6139 KiB  
Article
Structure of a Luminescent MOF-2 Derivative with a Core of Zn(II)-Terephthalate-Isoquinoline and Its Application in Sensing of Xylenes
by Luis D. Rosales-Vázquez, Iván J. Bazany Rodríguez, Simón Hernández-Ortega, Víctor Sánchez-Mendieta, Alfredo R. Vilchis-Nestor, José de Jesús Cázares-Marinero and Alejandro Dorazco-González
Crystals 2020, 10(5), 344; https://doi.org/10.3390/cryst10050344 - 27 Apr 2020
Cited by 10 | Viewed by 6157
Abstract
A new blue photoluminescent 2D metal–organic framework, 1, with formula {[Zn2(μ2-BDC)2(iQ)2]}∞ has been synthesized in a high yield under solvothermal conditions by reacting Zn(II) ions with 1,4-benzenedicarboxylic acid (H2BDC) [...] Read more.
A new blue photoluminescent 2D metal–organic framework, 1, with formula {[Zn2(μ2-BDC)2(iQ)2]}∞ has been synthesized in a high yield under solvothermal conditions by reacting Zn(II) ions with 1,4-benzenedicarboxylic acid (H2BDC) and isoquinoline (iQ) in DMF. Compound 1 was thoroughly characterized by single-crystal X-ray diffraction, solid-state cross-polarization magic-angle spinning 13C NMR, X-ray powder diffraction, scanning electron microscopy (SEM) with energy dispersive X-ray spectroscopy (EDS), and thermoanalysis. The crystal structure of 1 showed interpenetrated 2D frameworks consisting of dinuclear paddle-wheel cores Zn2; moreover, this material possessed thermostability up to 310 °C. The CPMAS 13C-NMR spectrum of 1 is consistent with the symmetry of the crystal structure. Luminescence studies showed that 1 strongly enhances its fluorescence emission in the presence of xylene isomers with a pronounced selectivity to p-xylene. Full article
(This article belongs to the Special Issue Fluorescent Complexes)
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16 pages, 3970 KiB  
Article
Fluorescence Properties and Density Functional Theory Calculation of a Structurally Characterized Heterotetranuclear [ZnII2–SmIII2] 4,4′-Bipy-Salamo-Constructed Complex
by Xiao-Xin An, Chang Liu, Zhuang-Zhuang Chen, Ke-Feng Xie and Yang Zhang
Crystals 2019, 9(11), 602; https://doi.org/10.3390/cryst9110602 - 17 Nov 2019
Cited by 57 | Viewed by 3755
Abstract
A new heterotetranuclear complex, [{Zn(L)Sm(NO3)3}2(4,4′-bipy)]·2CH3OH, was synthesized via an unsymmetrical single salamo-like ligand H2L: 6-methoxy-6′-ethoxy-2,2′-[ethylenedioxybis(azinomethyl)]diphenol, with Zn(OAc)2·2H2O, Sm(NO3)3·6H2O, and [...] Read more.
A new heterotetranuclear complex, [{Zn(L)Sm(NO3)3}2(4,4′-bipy)]·2CH3OH, was synthesized via an unsymmetrical single salamo-like ligand H2L: 6-methoxy-6′-ethoxy-2,2′-[ethylenedioxybis(azinomethyl)]diphenol, with Zn(OAc)2·2H2O, Sm(NO3)3·6H2O, and 4,4′-bipyridine by the one-pot method. The [ZnII2–SmIII2] complex was validated via elemental analysis, powder X-ray diffraction (PXRD) analysis, infrared spectroscopy, and ultraviolet–visible (UV–Vis) absorption spectroscopy. The X-ray single crystal diffraction analysis of the [ZnII2–SmIII2] complex was carried out via X-ray single-crystal crystallography. The crystal structure and supramolecular features were discussed. In addition, while studying the fluorescence properties of the [ZnII2–SmIII2] complex, the density functional theory (DFT) calculation of its structure was also performed. Full article
(This article belongs to the Special Issue Fluorescent Complexes)
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15 pages, 6473 KiB  
Article
A Newly Synthesized Heterobimetallic NiII-GdIII Salamo-BDC-Based Coordination Polymer: Structural Characterization, DFT Calculation, Fluorescent and Antibacterial Properties
by Yong-Fan Cui, Yu Zhang, Ke-Feng Xie and Wen-Kui Dong
Crystals 2019, 9(11), 596; https://doi.org/10.3390/cryst9110596 - 14 Nov 2019
Cited by 57 | Viewed by 3099
Abstract
A unprecedented hetero-bimetallic 3d-4f BDC-salamo-based coordination polymer, [(L)Ni(BDC)Gd(NO3)(DMF)] was prepared and validated via elemental analyses, IR and UV–Visible absorption spectra, DFT calculation, and X-ray crystallography. The six-coordinated Ni1 ion lies at the N2O2 donor site of the L [...] Read more.
A unprecedented hetero-bimetallic 3d-4f BDC-salamo-based coordination polymer, [(L)Ni(BDC)Gd(NO3)(DMF)] was prepared and validated via elemental analyses, IR and UV–Visible absorption spectra, DFT calculation, and X-ray crystallography. The six-coordinated Ni1 ion lies at the N2O2 donor site of the L2− moiety, and one DMF O atom and carboxylate O atom occupy, collectively, the axial positions, and form a twisted octahedron. The nine-coordinated Gd1 ion consists of three oxygen atoms (O12, O13, and O14) of two carboxylate groups, two oxygen atoms (O8 and O9) derived from one bidentate nitrate group, and an O2O2 coordination site (O1, O2, O6, and O5) of the L2− unit, forming a twisted three-capped triangular prism coordination geometry. Compared to the ligand (H2L), the fluorescence intensity decreases due to the coordination of metal ions. Meanwhile, the antibacterial activities are researched. Full article
(This article belongs to the Special Issue Fluorescent Complexes)
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Review

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12 pages, 2417 KiB  
Review
Fluorescent Gold Nanoclusters for Biosensor and Bioimaging Application
by Yunlong Bai, Tong Shu, Lei Su and Xueji Zhang
Crystals 2020, 10(5), 357; https://doi.org/10.3390/cryst10050357 - 30 Apr 2020
Cited by 40 | Viewed by 5062
Abstract
With the rapid development of materials technology, fluorescent gold nanoclusters (AuNCs) are emerging as novel functional materials for diagnostic applications including the detection of biomarkers and bioimaging due to the advantages of their ultra-small size, tunable emissions, size-dependent fluorescence and excellent biocompatibility. In [...] Read more.
With the rapid development of materials technology, fluorescent gold nanoclusters (AuNCs) are emerging as novel functional materials for diagnostic applications including the detection of biomarkers and bioimaging due to the advantages of their ultra-small size, tunable emissions, size-dependent fluorescence and excellent biocompatibility. In this review, we introduced the synthetic methods, and physical and chemical properties of AuNCs. Subsequently, we described the AuNCs-based design strategies for the detection of biomarkers including small molecules, DNA and proteins. The applications of AuNCs for tumor imaging in vitro and in vivo were also presented. Finally, we discussed the challenges and potential solutions of AuNCs-based nanosensors. Full article
(This article belongs to the Special Issue Fluorescent Complexes)
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