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Synthesis, Characterization and Applications of Metal Complexes

A special issue of Materials (ISSN 1996-1944). This special issue belongs to the section "Materials Chemistry".

Deadline for manuscript submissions: closed (31 October 2020) | Viewed by 12768

Special Issue Editors

Faculty of Chemistry, Nicolaus Copernicus University in Toruń, Torun, Poland
Interests: metal complexes; XRD; magnetic properties; spectroscopic methods; XAS; oxalate complexes; structural conversion; protein studies
Special Issues, Collections and Topics in MDPI journals
Faculty of Chemistry, Nicolaus Copernicus University in Toruń, Torun, Poland
Interests: new coordination and metalorganic compounds of copper, silver, palladium and rhenium; carboxylates; nanomaterials precursors (CVD, FEBID, spin-coating, dip-coating); studies of gas phase reactions (EIMS, VTIR); interactions with high- and low energy electrons

Special Issue Information

Dear Colleagues,

Since Werner’s famous complexes at the end of the nineteenth century, plenty of coordination compounds have been prepared and characterized. The term “metal complex” describes a variety of coordination compounds. It concerns very simple mononuclear species, as well as topologically complex polynuclear clusters. Despite many years of research, the interest in metal compounds has not ceased. Nowadays, metal organic frameworks (MOF) are considered to be not only porous materials but also containers for selective binding and tuned exchange (e.g., important in controlled drug delivery) and modified reactivity of bound guest molecules or ions. Many metal complexes are synthesized due to their optical properties (e.g., luminescent, non-linear optics (NLO) materials). Coordination and organometallic compounds are used as precursors to nanomaterials. Deposits can be obtained from the gas phase (CVD, ALD, FEBID) or using “wet” methods, such as spin- or dip-coating. The metal complexes can be considered to be catalysts in many processes (e.g., cobalt phthalocyanine in an electrochemical reduction of carbon dioxide). Obviously, there are many more metal compound classes characterized by different structural motifs and properties.

We encourage you to share your knowledge in the very broad field of metal complexes, revealing multiple properties and structures. The purpose of this Special Issue is to present the results of the latest research on synthesis methods, characterization techniques, and applications of metal complexes. Hence, potential topics include, but are not limited to, the following:

  • Synthesis methods;
  • Spectroscopic methods (e.g., IR, NMR, Raman, UV–Vis, CD, those using synchrotron radiation);
  • Structural determination using different diffraction techniques;
  • Characterization of different properties of metal complexes—magnetic, luminescence, porosity, conductivity, chirality, catalytic activity;
  • Application of theoretical methods for the determination of structures and properties of metal complexes;
  • A variety of applications of metal complexes.

Dr. Tadeusz M. Muzioł
Dr. Iwona B. Szymańska
Guest Editors

Manuscript Submission Information

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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. Materials 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 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

  • Coordination compounds
  • Synthesis strategies
  • Spectroscopic methods
  • Diffraction techniques
  • Porosity
  • Conductivity
  • Magnetic properties
  • Optical properties (e.g., luminescence, non-linear optics (NLO) materials)
  • Applications of metal complexes
  • Nanomaterials precursors (CVD, ALD, FEBID, spin- and dip-coating)

Published Papers (5 papers)

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Research

17 pages, 4565 KiB  
Article
Enhanced Antioxidant Activity of Ursolic Acid by Complexation with Copper (II): Experimental and Theoretical Study
by Mariola Samsonowicz, Monika Kalinowska and Kamila Gryko
Materials 2021, 14(2), 264; https://0-doi-org.brum.beds.ac.uk/10.3390/ma14020264 - 07 Jan 2021
Cited by 11 | Viewed by 2181
Abstract
The copper (II) complex of ursolic acid (Cu(II) UA) was synthesized and discussed in terms of its infrared, UV–visible spectra, quantum-chemical calculations at B3LYP/6-31G(d) level and antioxidant capacity. The copper (II) complex was stable in methanolic solution with the molar ratio metal:ligand 1:1. [...] Read more.
The copper (II) complex of ursolic acid (Cu(II) UA) was synthesized and discussed in terms of its infrared, UV–visible spectra, quantum-chemical calculations at B3LYP/6-31G(d) level and antioxidant capacity. The copper (II) complex was stable in methanolic solution with the molar ratio metal:ligand 1:1. The data obtained by FT-IR confirmed the metal ion coordination through the carboxylate anion. The antioxidant properties of ursolic acid and its complex with Cu were discussed on the basis of energy of the highest occupied molecular orbital (HOMO) and lowest unoccupied molecular orbital (LUMO) and values of chemical reactivity parameters. The antiradical properties of ursolic acid and the Cu (II) complex were examined against DPPH and HO radicals, and the ferric reducing antioxidant power (FRAP) was examined. The Cu(II) complex showed higher antioxidant activity than ursolic acid, i.e., in DPPH assay, the EC50 for UA was 47.0 mM, whereas, for Cu(II), UA EC50 = 19.5 mM; the FRAP value for UA was 20.8 µMFe2+, and 35.4 µMFe2+ for Cu(II) UA (compound concentration 3 mM). Although there was no distinct difference in the antioxidant activity against HO between these two chemicals, they were both better HO scavengers than DPPH and showed different kinetics in the reaction with DPPH. Full article
(This article belongs to the Special Issue Synthesis, Characterization and Applications of Metal Complexes)
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12 pages, 2833 KiB  
Article
Synthesis, Spectral, Thermal and Biological Studies of 4-Cyclohexyl-3-(4-nitrophenyl)methyl-1,2,4-triazolin-5-thione and Its Copper(II) Coordination Compound, [CuCl2(H2O)2L2]
by Agnieszka Czylkowska, Monika Drozd, Anna Biernasiuk, Bartłomiej Rogalewicz, Anna Malm and Monika Pitucha
Materials 2020, 13(18), 4135; https://0-doi-org.brum.beds.ac.uk/10.3390/ma13184135 - 17 Sep 2020
Cited by 2 | Viewed by 2013
Abstract
One of the strategies for seeking new biologically active substances is to modify compounds with potential biological activity. In this paper, 1,2,4-triazolin-5-thione derivative (3) was obtained in the cyclization reaction of appropriate thiosemicarbazide (2) as an organic ligand. The [...] Read more.
One of the strategies for seeking new biologically active substances is to modify compounds with potential biological activity. In this paper, 1,2,4-triazolin-5-thione derivative (3) was obtained in the cyclization reaction of appropriate thiosemicarbazide (2) as an organic ligand. The copper(II) complex, [CuCl2(H2O)2L2] (L=4-cyclohexyl-3-(nitrophenyl)methyl-1,2,4-triazolin-5-thione) (Cu-3) was prepared in a reaction of free ligand (3) with a CuCl2·2H2O solution in MeOH/EtOH mixture at room temperature. TGA data show that Cu-3 and free ligand are stable at room temperature. Both compounds were screened in vitro for antibacterial and antifungal activities using the broth microdilution method. The obtained complex (Cu-3) showed higher antibacterial effect, especially towards Gram-positive bacteria (with moderate activity and Minimal Inhibitory Concentration MIC = 250–500 µg/mL) than the free ligand (3) (with mild or no bioactivity and MIC ≥ 1000 µg/mL). In turn, yeasts, belonging to Candida albicans, exhibited similar sensitivity to both the copper(II) complex (Cu-3) and the organic ligand (3). The anticandidal activity of these compounds was moderate (MIC = 500 µg/mL), or, in the case of other Candida spp., lower (MIC ≥ 1000 µg/mL). Full article
(This article belongs to the Special Issue Synthesis, Characterization and Applications of Metal Complexes)
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17 pages, 4760 KiB  
Article
Synthesis, Spectroscopic, Thermal and Catalytic Properties of Four New Metal (II) Complexes with Selected N- and O-Donor Ligands
by Agnieszka Czylkowska, Bartłomiej Rogalewicz, Anita Raducka, Natalia Błaszczyk, Tomasz Maniecki, Kinga Wieczorek and Paweł Mierczyński
Materials 2020, 13(14), 3217; https://0-doi-org.brum.beds.ac.uk/10.3390/ma13143217 - 20 Jul 2020
Cited by 4 | Viewed by 2282
Abstract
Four solid compounds with formulae: Co(OAc)2(Im)·H2O (I), Ni(OAc)2(Im)1.5·2H2O (II), Cu2(OAc)4(Im) (III) and Zn(OAc)2(Im)·H2O (IV) (where: Im = 1H-Imidazole) were prepared and characterized by [...] Read more.
Four solid compounds with formulae: Co(OAc)2(Im)·H2O (I), Ni(OAc)2(Im)1.5·2H2O (II), Cu2(OAc)4(Im) (III) and Zn(OAc)2(Im)·H2O (IV) (where: Im = 1H-Imidazole) were prepared and characterized by chemical and elemental analysis, powder X-ray diffraction patterns and FTIR spectroscopy. Catalytic properties of each complex for styrene oxidation reaction were investigated. Furthermore, thermal properties of compounds were studied using the TG-DTG and DSC techniques under dry air atmosphere. Additionally, volatile thermal decomposition and fragmentation products were also investigated using the TG-FTIR spectra in air. Full article
(This article belongs to the Special Issue Synthesis, Characterization and Applications of Metal Complexes)
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15 pages, 2143 KiB  
Article
SnS2 and SnO2 Nanoparticles Obtained from Organotin(IV) Dithiocarbamate Complex and Their Photocatalytic Activities on Methylene Blue
by Jerry O. Adeyemi and Damian C. Onwudiwe
Materials 2020, 13(12), 2766; https://0-doi-org.brum.beds.ac.uk/10.3390/ma13122766 - 18 Jun 2020
Cited by 8 | Viewed by 2506
Abstract
This work reports the photocatalytic degradation of methylene blue (MB) dye using SnS2 and SnO2 nanoparticles obtained from a solvothermal decomposition (in oleylamine) and pyrolysis (in a furnace) processes, respectively, of the diphenyltin(IV) p-methylphenyldithiocarbamate complex. The complex, which was used [...] Read more.
This work reports the photocatalytic degradation of methylene blue (MB) dye using SnS2 and SnO2 nanoparticles obtained from a solvothermal decomposition (in oleylamine) and pyrolysis (in a furnace) processes, respectively, of the diphenyltin(IV) p-methylphenyldithiocarbamate complex. The complex, which was used as a single-source precursor and represented as [(C6H5)2Sn(L)2] (L = p-methylphenyldithiocarbamato), was synthesized and characterized using various spectroscopic techniques and elemental analysis. The structural properties and morphology of the as-synthesized nanoparticles were studied using X-ray diffraction (XRD) technique and transmission electron microscopy (TEM). UV-visible spectroscopy was used to study the optical property. The hexagonal phase of SnS2 and tetragonal SnO2 nanoparticles were identified, which exhibited varying sizes of hexagonal platelets and rod-like morphologies, respectively. The direct band gap energies of both materials, estimated from their absorption spectra, were 2.31 and 3.79 eV for SnS2 and SnO2, respectively. The photocatalytic performances of the SnS2 and SnO2 nanoparticle, studied using methylene blue (MB) as a model dye pollutant under light irradiation, showed that SnO2 nanoparticles exhibited a degradation efficiency of 48.33% after 120 min reaction, while the SnS2 nanoparticles showed an efficiency of 62.42% after the same duration of time. The higher efficiency of SnS2 compared to the SnO2 nanoparticles may be attributed to the difference in the structural properties, morphology and nature of the material’s band gap energy. Full article
(This article belongs to the Special Issue Synthesis, Characterization and Applications of Metal Complexes)
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8 pages, 1426 KiB  
Communication
An Investigation on the Electrochemical Behavior and Antibacterial and Cytotoxic Activity of Nickel Trithiocyanurate Complexes
by Amir M. Ashrafi, Pavel Kopel and Lukas Richtera
Materials 2020, 13(7), 1782; https://0-doi-org.brum.beds.ac.uk/10.3390/ma13071782 - 10 Apr 2020
Cited by 4 | Viewed by 2201
Abstract
The electrochemical redox behavior of three trinuclear Ni(II) complexes [Ni3(abb)3(H2O)3(µ-ttc)](ClO4)3 (1), [Ni3(tebb)3(H2O)3(µ-ttc)](ClO4)3·H2O (2), and [...] Read more.
The electrochemical redox behavior of three trinuclear Ni(II) complexes [Ni3(abb)3(H2O)3(µ-ttc)](ClO4)3 (1), [Ni3(tebb)3(H2O)3(µ-ttc)](ClO4)3·H2O (2), and [Ni3(pmdien)3(µ-ttc)](ClO4)3 (3), where abb = 1-(1H-benzimidazol-2-yl)-N-(1H-benzimidazol-2-ylmethyl)methan-amine, ttcH3 = trithiocyanuric acid, tebb = 2-[2-[2-(1H-benzimidazol-2-yl)ethylsulfanyl]ethyl]-1H-benzimidazole, and pmdien = N,N,N′,N″,N″-pentamethyldiethylenetriamine is reported. Cyclic voltammetry (CV) was applied for the study of the electrochemical behavior of these compounds. The results confirmed the presence of ttc and nickel in oxidation state +2 in the synthesized complexes. Moreover, the antibacterial properties and cytotoxic activity of complex 3 was investigated. All the complexes show antibacterial activity against Staphylococcus aureus and Escherichia coli to different extents. The cytotoxic activity of complex 3 and ttcNa3 were studied on G-361, HOS, K-562, and MCF7 cancer cell lines. It was found out that complex 3 possesses the cytotoxic activity against the tested cell lines, whereas ttcNa3 did not show any cytotoxic activity. Full article
(This article belongs to the Special Issue Synthesis, Characterization and Applications of Metal Complexes)
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