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Crystals
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New Advances in Transition Metal Complexes
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New Advances in Transition Metal Complexes

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

Deadline for manuscript submissions: closed (30 September 2023) | Viewed by 2102

Special Issue Editor

Dr. Samy Mahmoud El-Megharbel

E-Mail Website1 Website2
Guest Editor
1. Chemistry Department, Faculty of Science, Zagazig University, Zagazig 44519, Egypt
2. Chemistry Department, College of Sciences, Taif University, Taif 21944, Saudi Arabia
Interests: novel transition metals; spectroscopic analysis; chemical characterization; inorganic chemistry

Special Issue Information

Dear Colleagues,

Recent trends in nano-formulations with different biological activities based on the efficacy of active compounds such as novel synthesized mixed ligands with drugs, some flavonoid complexes, amino acids and some nutritional pharmacological formulas within them are among the most highly studied fields in the biological sciences. Driven by the current knowledge on the biological efficacy of active compounds, the need to maintain the structural integrity and reliability of materials and a renewed desire to improve the durability of new nanostructured and novel nutritional formulas with potent antioxidant capacities have seen a huge demand for experimental and modeling activities.

Extensive studies have been performed on the different protective and antioxidant activities of many active compounds against oxidative stress and diseases, and studies have yielded great benefits from conducting chemical characterization and spectroscopic analysis, in addition to studying the activities of antibiotic metal–drug complexes and flavonoid–metal–drug complexes against different toxicities.

The scope of this Special Issue will serve as a forum for papers on the following topics:

  • Experimental and physiological research with new ideas about the protective effects of different metal–drug complexes.
  • Anti-cancer activities of nanoformulations, novel complexes and natural extracts.
  • Understanding the complete spectroscopic characterization of different nanoformulas and their biological activities.
  • The latest pharmacological actions of anti-diabetic drugs and different drug complexes.
  • Recent developments in the quantitative and qualitative activities of vitamins and different active compounds.
  • Pharmacological and biological actions of metal–drug complexes with antibiotics and flavonoids.

Dr. Samy Mahmoud El-Megharbel
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 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

  • nanoformulas
  • metal–drug complexes
  • mixed ligands
  • antimicrobial activities
  • biological applications
  • antioxidant activities
  • flavonoids novel complexes

Published Papers (2 papers)

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Research

16 pages, 3469 KiB  
Article
A New Zn(II) Azido Complex of L-Arginine: X-ray Crystal Structure, Hirshfeld, and AIM Studies
by Mezna Saleh Altowyan, Amal Yousri, Jörg H. Albering, Roland C. Fischer, Morsy A. M. Abu-Youssef, Mohammed Salah Ayoup, Assem Barakat and Saied M. Soliman
Crystals 2023, 13(9), 1375; https://doi.org/10.3390/cryst13091375 - 14 Sep 2023
Viewed by 845
Abstract
The synthesis and X-ray crystal structure analyses of the azido complex [Zn(N3)(Arg)2](N3)·3H2O, where Arg is L-arginine, were presented. The molecular structure of the complex was further studied using FT-IR spectra as well as atoms in [...] Read more.
The synthesis and X-ray crystal structure analyses of the azido complex [Zn(N3)(Arg)2](N3)·3H2O, where Arg is L-arginine, were presented. The molecular structure of the complex was further studied using FT-IR spectra as well as atoms in molecules (AIM) theory. An analysis of the crystal data indicated monoclinic crystal system and P21 space group with a = 13.0283(5) Å, b = 15.2032(7) Å, c = 13.3633(6) Å, β = 114.3580(10)°, V = 2411.28(18) Å3, and Z = 4. Two of the [Zn(N3)(Arg)2](N3)·3H2O formulae represent the asymmetric unit of this complex where the geometric parameters of both units are slightly different. In [Zn(N3)(Arg)2](N3)·3H2O, the central Zn(II) ion is penta-coordinated with two Arg molecules as a bidentate ligand and one terminally coordinated azide ion. Each of the two Arg molecules are located trans to one another and coordinated with the Zn(II) via the N and O atoms of the amino and carboxylate groups, respectively. Hence, Zn(II) is five-coordinated and has a distorted square pyramidal coordination geometry. The supramolecular structure of the [Zn(N3)(Arg)2](N3)·3H2O complex was inspected using the Hirshfeld analysis. The O···H (26.6–28.4%), H···H (32.3–35.3%), and N···H (30.4–34.0%) contacts are the most significant interactions in the crystal structure of the [Zn(N3)(Arg)2](N3)·3H2O complex. The Zn–N, and Zn–O bonds have slight covalent interactions based on the AIM study. Full article
(This article belongs to the Special Issue New Advances in Transition Metal Complexes)
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14 pages, 5024 KiB  
Article
Synthesis, Supramolecular Structural Investigations of Co(II) and Cu(II) Azido Complexes with Pyridine-Type Ligands
by Mezna Saleh Altowyan, Jörg H. Albering, Assem Barakat, Saied M. Soliman and Morsy A. M. Abu-Youssef
Crystals 2023, 13(2), 346; https://doi.org/10.3390/cryst13020346 - 17 Feb 2023
Viewed by 960
Abstract
Two new Co(II) and Cu(II) azido complexes with 4-picoline (4-Pic) and pyridine-2-carboxaldoxime (HAld) were synthesized by self-assembly of the organic ligand and the M(II) nitrate in the presence of azide as a co-ligand. Their structures were determined to be [...] Read more.
Two new Co(II) and Cu(II) azido complexes with 4-picoline (4-Pic) and pyridine-2-carboxaldoxime (HAld) were synthesized by self-assembly of the organic ligand and the M(II) nitrate in the presence of azide as a co-ligand. Their structures were determined to be [Co(4-Pic)4(H2O)(N3)]NO3*H2O*4-Pic (1) and [Cu(HAld)(Ald)(N3)] (2) using X-ray single crystal diffraction. In complex 1, the coordination geometry is a slightly distorted octahedron with a water molecule and azide ion located trans to one another. On the other hand, complex 2 has a distorted square pyramid CuN5 coordination sphere with N-atoms of the organic ligand as a basal plane and azide ion as apical. All types of intermolecular contacts and their contributions in the molecular packing were analyzed using Hirshfeld analysis. The intermolecular contacts, H…H (53.9%), O…H (14.1%), N…H (11.0%) and H…C (18.8%) in 1, and H…H (27.4%), N…H (27.7%), O…H (14.7%) and H…C (13.6%) in 2 have the largest contributions. Of all the contacts, the O…H, N…H and C…C interactions in 2 and the O…H, N…H and H…C in 1 are apparently shorter than the van der Waals radii sum of the interacting atoms. Atoms in molecules (AIM) topological parameters explained the lower symmetry of the coordinated azide in 1 than 2. Full article
(This article belongs to the Special Issue New Advances in Transition Metal Complexes)
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