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Crystals
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Synthesis and Characterization of Metal-Organic Structures
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Synthesis and Characterization of Metal-Organic Structures

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

Deadline for manuscript submissions: closed (31 March 2023) | Viewed by 2755

Special Issue Editor

Dr. Rakesh Ganguly

E-Mail Website
Guest Editor
Department of Chemistry, Shiv Nadar, Institution of Eminence, Greater Noida, India
Interests: coordination chemistry; X-ray crystallography; bio-organometallics; catalysis; coordination polymer

Special Issue Information

Dear Colleagues,

Metal–organic frameworks (MOFs), a concept introduced about three decades ago, have a wide range of properties and are among the most promising materials. Metal–organic hybrids are a unique class of crystalline materials dominated by weak and moderate coordination bonds between metal and organic linkers forming a 3-D structure.

The physical property (porosity, pore size, pore surface, absorption of gas molecules) of metal–organic structures are determined by both, metal ions and linkers. The structural properties of such structures can be controlled and modified by the solvent system, pH, metal ions, ratio of the reactants, and temperature.

Single crystal X-ray Diffraction and NMR has played a major role in the structural characterization and, thus, understanding of the properties of such metal organic structures. The elucidation of structures has also attracted the analytical chemist to explore the various applications of such metal–organic structures ranging from chromatographic separation to absorption of greenhouse gases. With a better understanding of the structures and weak interactions in metal–organic structures the application is not limited to catalysis, gas separation and electrochemical sensors but has expanded to magnetic solid phase extraction and clean energy.

This Special Issue aims to present the recent developments in the synthesis, characterization, properties, and applications of metal–organic structures.

Dr. Rakesh Ganguly
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

  • modular structure
  • metal–organic framework
  • coordination polymer
  • porous materials
  • gas storage
  • sensors
  • catalysts

Published Papers (2 papers)

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Research

17 pages, 20552 KiB  
Article
A Series of New Manganese(II) Polynuclear Complexes Based on Nitrothiacalix[4]arenes: The Study of Interplay between Macrocycle Platform Flexibility and Structural Diversity of Coordination Compounds
by Alexander S. Ovsyannikov, Iuliia V. Strelnikova, Ilya D. Shutilov, Daut R. Islamov, Pavel V. Dorovatovskii, Aidar T. Gubaidullin, Artem S. Agarkov, Svetlana E. Solovieva and Igor S. Antipin
Crystals 2023, 13(7), 1017; https://doi.org/10.3390/cryst13071017 - 26 Jun 2023
Cited by 3 | Viewed by 984
Abstract
Four new manganese(II) complexes, based on dinitro and tetranitrothiacalix[4]arenes, were synthesized and characterized from structural points of view in the crystalline phase. It was revealed that thiacalix[4]arenes decorated with two and four electron withdrawing groups, when combined with MnCl2, afforded the [...] Read more.
Four new manganese(II) complexes, based on dinitro and tetranitrothiacalix[4]arenes, were synthesized and characterized from structural points of view in the crystalline phase. It was revealed that thiacalix[4]arenes decorated with two and four electron withdrawing groups, when combined with MnCl2, afforded the formation of similar tetranuclear complexes 1 and 2a with two non-equivalent metal ions and a rhombic geometry of the metallic cluster core. The distortion of the coordination sphere of metal cations within the obtained complexes was found to be dependent on the number of nitro groups located at the upper rim of the macrocyclic backbone, adopted in cone conformation. The tetranuclear complex 2b of a different type, displaying the formation of a dinuclear cluster core, crystallized in a non-centrosymmetric space group was obtained, when tetranitrothiacalix[4]arene, adopted in a partial cone conformation, was involved in coordination with manganese(II) cations. The switching of coordination behavior for the macrocyclic ligand in 2b was achieved due to the presence of upper-rim-disposed electron-withdrawing nitro groups, increasing the flexibility of the macrocyclic backbone by breaking the H-bonding between the OH phenolate moieties within the ligand structure. Finally, the use of 2,2′-bipyridine as an auxiliary ligand in coordination with tetranitrothiacalix[4]arene and manganese(II) cations led to the third type complex formation 3, where the macrocycle platform adopted in a 1.2-alternate conformation. Full article
(This article belongs to the Special Issue Synthesis and Characterization of Metal-Organic Structures)
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17 pages, 2614 KiB  
Article
Structure and Molecular Dynamics in Metal-Containing Polyamide 6 Microparticles
by Filipa M. Oliveira, Teresa G. Nunes, Nadya V. Dencheva and Zlatan Z. Denchev
Crystals 2022, 12(11), 1579; https://doi.org/10.3390/cryst12111579 - 5 Nov 2022
Viewed by 1489
Abstract
Polymer microparticles are used in additive manufacturing, separation and purification devices, biocatalysis, or for the recognition of biomolecules. This study reports on the effect of metal fillers on the structure and molecular dynamics of polyamide 6 (PA6) microparticles (MPs) containing up to 19 [...] Read more.
Polymer microparticles are used in additive manufacturing, separation and purification devices, biocatalysis, or for the recognition of biomolecules. This study reports on the effect of metal fillers on the structure and molecular dynamics of polyamide 6 (PA6) microparticles (MPs) containing up to 19 wt.% of Al, Cu, or Mg. These hybrid MPs are synthesized via reactive microencapsulation by anionic ring-opening polymerization in solution, in the presence of the metal filler. 13C high-resolution solid-state NMR (ssNMR) spectroscopy is employed as the primary characterization method using magic angle spinning (MAS) and cross-polarization (CP)/MAS. Depending on the metal filler, the ssNMR crystallinity index of the MP varies between 39–50%, as determined by deconvolution of the 13C MAS and CP/MAS spectra. These values correlate very well with the crystallinity derived from thermal or X-ray diffraction data. The molecular dynamics study on PA6 and Cu-containing MP shows similar mobility of carbon nuclei in the kHz, but not in the MHz frequency ranges. The paramagnetic Al and Mg have an observable effect on the relaxation; however, conclusions regarding the PA6 carbon motions cannot be unequivocally made. These results are useful in the preparation of hybrid microparticles with customized structures and magneto-electrical properties. Full article
(This article belongs to the Special Issue Synthesis and Characterization of Metal-Organic Structures)
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