scholarly journals Oligonuclear Actinoid Complexes with Schiff Bases as Ligands—Older Achievements and Recent Progress

2020 ◽  
Vol 21 (2) ◽  
pp. 555 ◽  
Author(s):  
Sokratis T. Tsantis ◽  
Demetrios I. Tzimopoulos ◽  
Malgorzata Holynska ◽  
Spyros P. Perlepes
Keyword(s):  
Schiff Base ◽  
Coordination Chemistry ◽  
Metal Ions ◽  
Schiff Bases ◽  
Environmental Chemistry ◽  
Scientific Information ◽  
General Information ◽  
Schiff Base Complexes ◽  
Oxidation States ◽  
Schiff Base Ligands

Even 155 years after their first synthesis, Schiff bases continue to surprise inorganic chemists. Schiff-base ligands have played a major role in the development of modern coordination chemistry because of their relevance to a number of interdisciplinary research fields. The chemistry, properties and applications of transition metal and lanthanoid complexes with Schiff-base ligands are now quite mature. On the contrary, the coordination chemistry of Schiff bases with actinoid (5f-metal) ions is an emerging area, and impressive research discoveries have appeared in the last 10 years or so. The chemistry of actinoid ions continues to attract the intense interest of many inorganic groups around the world. Important scientific challenges are the understanding the basic chemistry associated with handling and recycling of nuclear materials; investigating the redox properties of these elements and the formation of complexes with unusual metal oxidation states; discovering materials for the recovery of trans-{UVIO2}2+ from the oceans; elucidating and manipulating actinoid-element multiple bonds; discovering methods to carry out multi-electron reactions; and improving the 5f-metal ions’ potential for activation of small molecules. The study of 5f-metal complexes with Schiff-base ligands is a currently “hot” topic for a variety of reasons, including issues of synthetic inorganic chemistry, metalosupramolecular chemistry, homogeneous catalysis, separation strategies for nuclear fuel processing and nuclear waste management, bioinorganic and environmental chemistry, materials chemistry and theoretical chemistry. This almost-comprehensive review, covers aspects of synthetic chemistry, reactivity and the properties of dinuclear and oligonuclear actinoid complexes based on Schiff-base ligands. Our work focuses on the significant advances that have occurred since 2000, with special attention on recent developments. The review is divided into eight sections (chapters). After an introductory section describing the organization of the scientific information, Sections 2 and 3 deal with general information about Schiff bases and their coordination chemistry, and the chemistry of actinoids, respectively. Section 4 highlights the relevance of Schiff bases to actinoid chemistry. Sections 5–7 are the “main menu” of the scientific meal of this review. The discussion is arranged according the actinoid (only for Np, Th and U are Schiff-base complexes known). Sections 5 and 7 are further arranged into parts according to the oxidation states of Np and U, respectively, because the coordination chemistry of these metals is very much dependent on their oxidation state. In Section 8, some concluding comments are presented and a brief prognosis for the future is attempted.

scholarly journals Synthesis and Characterization of New Homo- and Heteronuclear Schiff Base Complexes

Proceedings ◽  
2019 ◽  
Vol 29 (1) ◽  
pp. 77
Author(s):  
Spinciu ◽  
Maxim ◽  
Pătrașcu ◽  
Popescu
Keyword(s):  
Schiff Base ◽  
Schiff Bases ◽  
Chemical Elements ◽  
Schiff Base Complexes ◽  
Oxidation States ◽  
Synthesis And Characterization

Schiff bases are the most extensively used versatile ligands, capable of coordinating several chemical elements and stabilizing them in numerous oxidation states. [...]

scholarly journals Design and Development of Complexation of Ce+3 Metal Ions with Synthesized INZ Incorporated Bio-active Schiff Bases

2021 ◽  
Vol 11 (4) ◽  
pp. 3989-4006
Keyword(s):  
Schiff Base ◽  
Metal Ions ◽  
Schiff Bases ◽  
Elemental Analysis ◽  
Metal Ion ◽  
Organic Ligands ◽  
Schiff Base Complexes ◽  
Spectral Techniques ◽  
The Stability ◽  
Antibacterial And Antifungal

In the present research, a series of Ce+3 metal ions complexation with INZ incorporating Schiff bases have been reported. INZ incorporated Schiff Bases (3a-e) were developed by condensing INZ with substituted aromatic aldehyde and confirmed with various spectral Techniques such as Elemental analysis, UV, IR, 1H-NMR, 13H NMR. All the synthesized organic ligands were evaluated against antibacterial and antifungal stains and found moderate to significant results. The Ce+3 metal ion solution mixed with newly prepared bio-active INZ Schiff bases (3a-e) to afford the [Ce-INZ Schiff Base] complexes (4a-e). The stability constants of prepared complexes were evaluated and found in order as a (3e) > (3d) > (3a) > (3b) > (3c).

scholarly journals Applications of Chitosan Based Schiff bases and its Complexes – A Review

2021 ◽  
pp. 157-170
Author(s):  
Veena R Nair ◽  
Meera Jacob ◽  
Texin Joseph ◽  
Jaya T Varkey
Keyword(s):  
Schiff Base ◽  
Metal Ions ◽  
Metal Complexes ◽  
Schiff Bases ◽  
Schiff Base Complexes ◽  
Amino Group ◽  
Chemical Modifications ◽  
Research Fields ◽  
Chitosan Schiff Base ◽  
Chitosan Schiff Bases

Chitosan, a natural polysaccharides biopolymer is a versatile and promising biomaterial. Chitosan metal complexes stand out in their applicability in different research fields due to their biocompatibility and biodegradability properties. Presence of primary aliphatic amino group along the polymer chain allows for a variety of chemical modifications, of which the most significant is imine functionalization. The ability to easily perform complexation between chitosan Schiff bases and metal ions results in metal complexes, enhancing its application, resulting in further innovation in various fields. The most recent advances of chitosan Schiff base complexes in various fields, including biomedical, catalysis, environmental, and adsorption are summarised in this review.

scholarly journals Antimicrobial complexes of Schiff base ligands and copper family metal ions

2014 ◽  
Vol 70 (a1) ◽  
pp. C1247-C1247
Author(s):  
Sonja Kracht ◽  
Katharina Fromm
Keyword(s):  
Schiff Base ◽  
Metal Ions ◽  
Schiff Bases ◽  
Polymer System ◽  
Antimicrobial Properties ◽  
Polymer Chains ◽  
Schiff Base Complexes ◽  
Functionalized Pyridine ◽  
Silver Release ◽  
Schiff Base Metal Complexes

Schiff base complexes were extensively studied because of their catalytic properties in various fields and partly for their biological activity[1]. The utilisation of copper (II)[2] and silver (I)[3] can introduce antimicrobial properties to these structures or enhance them; thus provides new fields of applications, like in medicine. Compared to classical Schiff bases, the synthesis of dual N,N-donor Schiff bases is facile too, and the resulting product contains several coordination sides for diverse metals. Applying these unique advantages, we developed several antibacterial Schiff base metal complexes. Our ligand system is based on functionalized pyridine end-capped imine linker units which differ in the nature of the linker chain, such as ethylene glycols or alkyl chains. Substitution on the pyridine rings offer the possibility to attach oligomers or polymer chains which can work e.g. as handles. By applying, for example, mechanical force, like ultra-sonication, the metal ions can be released (Figure 1) by an external trigger and used for catalysis or in medicine, where its antimicrobial properties are required. Figure 1: Schematic illustration of controlled silver release from a ligand-polymer system by applied force (arrows).

scholarly journals Green Synthesis and Antimicrobial Studies of Ni(II) and Zn(II) Dinuclear Schiff Base Complexes

2018 ◽  
Vol 7 (3.11) ◽  
pp. 237 ◽  
Author(s):  
Karimah Kassim ◽  
Muhamad Azwan Hamali
Keyword(s):  
Schiff Base ◽  
Metal Ions ◽  
Antimicrobial Properties ◽  
Schiff Base Complexes ◽  
Diffusion Method ◽  
Microwave Assisted Synthesis ◽  
Schiff Base Ligands ◽  
Antimicrobial Studies ◽  
Coordination Sites ◽  
Synthesis Approach

A series of tetradentate Zn(II) and Ni(II) Schiff base complexes derived from N,N-Bis-(2-hydroxyl-5-methoxybenzaldehyde)-m-phenylenediamine was synthesized using microwave assisted synthesis approach for 5-15 minutes. The confirmation of the ligand as well the respective complexes has been elucidated through physiochemical and spectroscopy analyses. The studies show that two metal ions formed bridges connecting two Schiff base ligands. The nitrogen and oxygen atoms in each ligand served as coordination sites for the metal ions. The Schiff base ligand and complexes were screened for antimicrobial properties using Disc diffusion method against Escherichia coli, Bacillus subtilis, Enterobacter cloacae, and Klebsiella pneumoniae. The screening shows that both Zn(II) and Ni(II) complexes give signif-icant inhibition towards the bacteria tested.  

scholarly journals Review on Schiff Base: A Scrupulous Binding Detector for Metal Ions

2020 ◽  
pp. 29-33
Author(s):  
Keyur D. Bhatt ◽  
Surbhi V. Upadhyay
Keyword(s):  
Drug Delivery ◽  
Schiff Base ◽  
Coordination Chemistry ◽  
Transition Metal ◽  
Metal Ions ◽  
Schiff Bases ◽  
Transition Metal Ions ◽  
Interesting Application

The Schiff bases find interesting application in the field of analytical, biological, medicinal and chemistry etc. Hence, there is an increasing interest in the synthesis of new Schiff bases. Schiff bases find application as ionic and neutral analyses by complexation, applications as a microbial and drug delivery. Synthesis of Schiff base and their complexes with transition metal ions herald many promises in the field of coordination chemistry.   

scholarly journals Utilization and simulation of innovative new binuclear Co(ii), Ni(ii), Cu(ii), and Zn(ii) diimine Schiff base complexes in sterilization and coronavirus resistance (Covid-19)

2021 ◽  
Vol 19 (1) ◽  
pp. 772-784
Author(s):  
Moamen S. Refat ◽  
Ahmed Gaber ◽  
Walaa F. Alsanie ◽  
Mohamed I. Kobeasy ◽  
Rozan Zakaria ◽  
...  
Keyword(s):  
Schiff Base ◽  
Molecular Docking ◽  
Metal Ions ◽  
Free Ligand ◽  
Schiff Base Complexes ◽  
Hydroxyl Groups ◽  
Binuclear Complexes ◽  
Central Metal ◽  
H Nmr ◽  
Biological Studies

Abstract This article aimed at the synthesis and molecular docking assessment of new diimine Schiff base ligand, namely 2-((E)-(2-((Z)-2-(4-chlorophenyl)-2-hydroxyvinyl)hydrazono) methyl)-6-methoxyphenol (methoxy-diim), via the condensation of 1-(4-chloro-phenyl)-2-hydrazino-ethenol compound with 2-((E)-(2-((Z)-2-(4-chlorophenyl)-2-hydroxy vinyl) hydrazono)methyl)-6-methoxyphenol in acetic acid as well as the preparation of new binuclear complexes of Co(ii), Ni(ii), Cu(ii), and Zn(ii). The following synthesized complexes were prepared in a ratio of 2:1 (metal/ligand). The 1H-NMR, UV-Vis, and FTIR spectroscopic data; molar conductivity measurements; and microanalytical, XRD, TGA/DTG, and biological studies were carried out to determine the molecular structure of these complexes. According to the spectroscopic analysis, the two central metal ions were coordinated with the diamine ligand via the nitrogen of the hydrazine and oxygen of the hydroxyl groups for the first metal ions and via the nitrogen of the hydrazine and oxygen of the phenol group for the second metal ions. Molecular docking for the free ligand was carried out against the breast cancer 3hb5-oxidoreductase and the 4o1v-protein binding kidney cancer and COVID-19 protease, and good results were obtained.

Complexes of water-soluble hexadentate schiff base ligands with a number of metal ions

Polyhedron ◽  
1988 ◽  
Vol 7 (19-20) ◽  
pp. 1881-1889 ◽  
Author(s):  
Dennis F. Evans ◽  
David A. Jakubovic
Keyword(s):  
Schiff Base ◽  
Metal Ions ◽  
Water Soluble ◽  
Schiff Base Ligands

Notizen: Magnetic Studies on Schiff Base Complexes of Al(III) and Si(IV)

1974 ◽  
Vol 29 (7-8) ◽  
pp. 565-566 ◽  
Author(s):  
R. N. Prasad ◽  
J. P. Tandon
Keyword(s):  
Schiff Base ◽  
Schiff Bases ◽  
Schiff Base Complexes ◽  
Magnetic Studies ◽  
Magnetic Susceptibilities

The magnetic susceptibilities of some newly syntesized Al(III) and Si(IV) complexes of Schiff bases derived from the condensation of o-hydroxyacetophenone or 2-dydroxy-1-naphthaldehyde with hydroxyalkylamines or diamines have been measured and the data indicate their diamagnetic character.

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