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Molecules
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Zn(II) and Cd(II) Coordination Polymers: Advances and Perspectives II
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Zn(II) and Cd(II) Coordination Polymers: Advances and Perspectives II

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

Deadline for manuscript submissions: 30 June 2024 | Viewed by 2273

Special Issue Editors

Dr. Marina Fonari

E-Mail Website
Guest Editor
Institute of Applied Physics, Moldova State University, 5 MD2028, Chisinau, Moldova
Interests: coordination chemistry of d10 transition metals; single crystal X-ray crystallography; crystal engineering; fluorescence; supramolecular chemistry; structure and properties of molecular materials; intermolecular interactions; H-bonding; self-assembly phenomena; guest inclusion
Special Issues, Collections and Topics in MDPI journals
Dr. Rodica Olar

E-Mail Website
Guest Editor
Department of Inorganic Chemistry, Faculty of Chemistry, University of Bucharest, 050663 Bucharest, Romania
Interests: coordination chemistry; biological active species (organic and inorganic); characterization methods (ESI-MS, NMR, IR, EPR)
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

In the mid-1990s, the first Zn(II) (Zaworotko et al, 1995; Yaghi et al., 1999) and Cd(II) (Fujita et al., 1994) coordination networks were reported. In the 21st century, the coordination polymers based on the closed-shell d10 metals such as Zn and Cd remain in the focus of coordination and supramolecular chemistry, crystal engineering, and materials science. Alongside the rigid MOF structures, the flexible and dynamic stimuli-responsive 1D and 2D coordination polymers are a hot topic and the subject of cutting-edge current studies. Among the novel, intriguing approaches in this field, the organization of CPs on surfaces with possible technological applications in nanoelectronics, spintronics, or nanosensing; obtaining the liquid/glassy states in metallo-organic coordination polymers by design principles; and the registration of photochromic behavior as a prerequisite for the inkless and erasable printing media can be mentioned as only a few examples.

Since the library of Zn(II) and Cd(II) coordination networks is numerous and continues to grow rapidly, demonstrating fascinated crystal structures and impressive properties, the Editorial Board of Molecules, thus, decided to devote a Special Issue of the journal to this topic. This Special Issue is expected to provide an excellent platform to report results that highlight the synthesis and crystal structures in combination with the spectrum of impressive properties of Zn(II) and Cd(II) coordination polymers. As Guest Editor, I cordially invite scientists from various fields to submit articles which cover a broad range of subjects in coordination polymer chemistry.

Dr. Marina Fonari
Dr. Rodica Olar
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

  • new eco-friendly synthetic protocols
  • solution crystallization
  • solid-state grinding
  • solvent drop grinding
  • eco-friendly/new linkers
  • mixed-ligand, hybrid organic/inorganic ligand strategies
  • functionalized ligands
  • crystal engineering guidelines as a pathway for systematic design
  • SC-SC transformations in 1D, 2D, 3D CPs
  • adsorption/separation processes in 1D, 2D, CPs and 3D MOFs
  • flexibility
  • guest-responsive porous coordination networks
  • chiral coordination networks in the presence/absence of chiral components
  • the interplay of coordinative, hydrogen bonding, stacking interactions in sustaining crystal stability
  • the fluorescence properties of CPs
  • emission modulation
  • CPs as sensors for hazardous pollutants
  • rationales for effective multifunctional materials

Published Papers (3 papers)

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Research

13 pages, 2785 KiB  
Article
One-Dimensional and Two-Dimensional Zn(II) Coordination Polymers with Ditopic Imidazo[1,5-a]pyridine: A Structural and Computational Study
by Mattia Sozzi, Michele R. Chierotti, Roberto Gobetto, Rosa M. Gomila, Vittoria Marzaroli, Emanuele Priola, Giorgio Volpi, Stefano Zago, Antonio Frontera and Claudio Garino
Molecules 2024, 29(3), 653; https://doi.org/10.3390/molecules29030653 - 30 Jan 2024
Viewed by 571
Abstract
Zn(II) coordination polymers are being increasingly studied for their stability and properties. Similarly, there is a growing interest in imidazo[1,5-a]pyridine derivatives, which show great potential in luminescence and pharmaceutical applications. In this work, we successfully synthesized and crystallized three new coordination [...] Read more.
Zn(II) coordination polymers are being increasingly studied for their stability and properties. Similarly, there is a growing interest in imidazo[1,5-a]pyridine derivatives, which show great potential in luminescence and pharmaceutical applications. In this work, we successfully synthesized and crystallized three new coordination polymers, using Zn(II) as the metallic node, dicarboxylic acids of different length and nature as linkers, and a linear ditopic imidazo[1,5-a]pyridine derivative, to explore the role of this molecule as a propagator of the dimensionality of the structure or as an ancillary ligand. Our work demonstrates the structural capability of imidazo[1,5-a]pyridines in an unexplored domain for this family of ligands. Notably, we observed a pronounced ability of this heterocyclic scaffold to establish π···π interactions in the solid state. The supramolecular π-stacked assemblies were theoretically analyzed using DFT calculations based on model structures. Full article
(This article belongs to the Special Issue Zn(II) and Cd(II) Coordination Polymers: Advances and Perspectives II)
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20 pages, 3767 KiB  
Article
Reactions of Cadmium(II) Halides and Di-2-Pyridyl Ketone Oxime: One-Dimensional Coordination Polymers
by Christina Stamou, Pierre Dechambenoit, Zoi G. Lada, Patroula Gkolfi, Vassiliki Riga, Catherine P. Raptopoulou, Vassilis Psycharis, Konstantis F. Konidaris, Christos T. Chasapis and Spyros P. Perlepes
Molecules 2024, 29(2), 509; https://doi.org/10.3390/molecules29020509 - 19 Jan 2024
Viewed by 638
Abstract
The coordination chemistry of 2-pyridyl ketoximes continues to attract the interest of many inorganic chemistry groups around the world for a variety of reasons. Cadmium(II) complexes of such ligands have provided models of solvent extraction of this toxic metal ion from aqueous environments [...] Read more.
The coordination chemistry of 2-pyridyl ketoximes continues to attract the interest of many inorganic chemistry groups around the world for a variety of reasons. Cadmium(II) complexes of such ligands have provided models of solvent extraction of this toxic metal ion from aqueous environments using 2-pyridyl ketoxime extractants. Di-2-pyridyl ketone oxime (dpkoxH) is a unique member of this family of ligands because its substituent on the oxime carbon bears another potential donor site, i.e., a second 2-pyridyl group. The goal of this study was to investigate the reactions of cadmium(II) halides and dpkoxH in order to assess the structural role (if any) of the halogeno ligand and compare the products with their zinc(II) analogs. The synthetic studies provided access to complexes {[CdCl2(dpkoxH)∙2H2O]}n (1∙2H2O), {[CdBr2(dpkoxH)]}n (2) and {[CdI2(dpkoxH)]}n (3) in 50–60% yields. The structures of the complexes were determined by single-crystal X-ray crystallography. The compounds consist of structurally similar 1D zigzag chains, but only 2 and 3 are strictly isomorphous. Neighboring CdII atoms are alternately doubly bridged by halogeno and dpkoxH ligands, the latter adopting the η1:η1:η1:μ (or 2.0111 using Harris notation) coordination mode. A terminal halogeno group completes distorted octahedral coordination at each metal ion, and the coordination sphere of the CdII atoms is {CdII(η1 − X)(μ − X)2(Npyridyl)2(Noxime)} (X = Cl, Br, I). The trans-donor–atom pairs in 1∙2H2O are Clterminal/Noxime and two Clbridging/Npyridyl; on the contrary, these donor–atom pairs are Xterminal/Npyridyl, Xbridging/Noxime, and Xbridging/Npyridyl (X = Br, I). There are intrachain H-bonding interactions in the structures. The packing of the chains in 1∙2H2O is achieved via π-π stacking interactions, while the 3D architecture of the isomorphous 2 and 3 is built via C-H∙∙∙Cg (Cg is the centroid of one pyridyl ring) and π-π overlaps. The molecular structures of 1∙2H2O and 2 are different compared with their [ZnX2(dpkoxH)] (X = Cl, Br) analogs. The polymeric compounds were characterized by IR and Raman spectroscopies in the solid state, and the data were interpreted in terms of the known molecular structures. The solid-state structures of the complexes are not retained in DMSO, as proven via NMR (1H, 13C, and 113Cd NMR) spectroscopy and molar conductivity data. The complexes completely release the coordinated dpkoxH molecule, and the dominant species in solution seem to be [Cd(DMSO)6]2+ in the case of the chloro and bromo complexes and [CdI2(DMSO)4]. Full article
(This article belongs to the Special Issue Zn(II) and Cd(II) Coordination Polymers: Advances and Perspectives II)
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11 pages, 4768 KiB  
Article
Functionalization of ZnAl-Layered Double Hydroxide with Ensulizole and Its Application as a UV-Protective Agent in a Transparent Polymer Coating
by Klára Melánová, Kateřina Kopecká, Ludvík Beneš, Petr Kutálek, Petr Knotek, Zuzana Zmrhalová and Jan Svoboda
Molecules 2023, 28(17), 6262; https://doi.org/10.3390/molecules28176262 - 26 Aug 2023
Cited by 1 | Viewed by 671
Abstract
In this study, we propose a promising photoprotective additive that combines the advantages of both organic UV absorbers and inorganic particles without compromising the properties of the paint material. This additive involves the intercalation of a well-known organic UV absorber, 2-phenylbenzimidazole-5-sulfonic acid (PBISA), [...] Read more.
In this study, we propose a promising photoprotective additive that combines the advantages of both organic UV absorbers and inorganic particles without compromising the properties of the paint material. This additive involves the intercalation of a well-known organic UV absorber, 2-phenylbenzimidazole-5-sulfonic acid (PBISA), into zinc-aluminum layered double hydroxide (ZnAl-LDH). Three ZnAl-LDH intercalates with PBISA were prepared using various methods based on either anion exchange or direct synthesis. The intercalates were characterized using powder X-ray diffraction, thermogravimetry, elemental analysis, and IR and UV-Vis spectroscopies. The composition and basal spacings of all three intercalates are very similar. An effective UV protection film was prepared when the ZnAl–PBISA–1 intercalate was incorporated into polyurethane-acrylate lacquer. The resultant UV protective film exhibited stability and uniform distribution of the intercalated fillers. Some minimal particle sedimentation and aggregation were observed on the cured film’s underside, but did not compromise the films’ UV protective properties. The prepared lacquers with intercalated fillers offer a viable solution for the surface modification of plastic products. Full article
(This article belongs to the Special Issue Zn(II) and Cd(II) Coordination Polymers: Advances and Perspectives II)
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