Metal Ion Induced Rearrangements of Bisbenzothiazoline to the Schiff Base Complexes : Reactions with Gallium and Indium Isopropoxides

1980 ◽  
Vol 10 (3) ◽  
pp. 305-317 ◽  
Author(s):  
M. Aqrawal ◽  
J. P. Tandon ◽  
R. C. Mehrotra
Keyword(s):  
Schiff Base ◽  
Metal Ion ◽  
Schiff Base Complexes

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).

Spectroscopic and Magnetic Properties of Gadolinium Macroacyclic and Macrobicyclic Complexes

2007 ◽  
Vol 128 ◽  
pp. 199-205
Author(s):  
G. Leniec ◽  
Slawomir M. Kaczmarek ◽  
J. Typek ◽  
Beata Kołodziej ◽  
Eugeniusz Grech ◽  
...  
Keyword(s):  
Schiff Base ◽  
Metal Ion ◽  
Molecular Spectroscopy ◽  
Schiff Base Complex ◽  
Schiff Base Complexes ◽  
Magnetic Interactions ◽  
Paramagnetic Resonance ◽  
Complex Samples ◽  
Integrated Intensity ◽  
Electron Paramagnetic

As a result of the Schiff base condensation the gadolinium macroacyclic and macrobicyclic Schiff base complexes have been synthesized and investigated by infrared spectroscopy (IR) and electron paramagnetic resonance (EPR). Both electron ionization and electron spray Molecular Spectroscopy spectra confirmed the [1:1] proportion of a ligand to metal in gadolinium macrocyclic and mocrobicyclic Schiff base complex samples. The thermogravimetrydifferential thermal analysis (TG-DTA) indicated the presence of two water molecules in the innersphere of the macrobicyclic complex and confirmed no water coordination of the metal ion in the macroacyclic complex. The temperature dependence of the integrated intensity of the EPR spectra enabled the magnetic interactions in the spin system of these compounds to be revealed.

scholarly journals Kinetics and Mechanism of Catalyzed Oxidation of L-Cysteine by Salen Schiff Base Complexes of Co(III), Fe (III) and Cr(III)

2021 ◽  
Vol 13 (2) ◽  
pp. 25
Author(s):  
Hamzeh M. Abdel-Halim ◽  
Hutaf M. Baker ◽  
Akef I. Alhmaideen ◽  
Adnan S. Abu-Surrah
Keyword(s):  
Schiff Base ◽  
Metal Ion ◽  
Reduction Potential ◽  
Order Conditions ◽  
Schiff Base Complexes ◽  
Kinetics Of Oxidation ◽  
First Order ◽  
Constant Ph ◽  
Kinetics Of ◽  
Catalyzed Oxidation

Kinetics of oxidation of L-cysteine by new series of substituted ONNO-donor salen-type Schiff base complexes of general formula [MIII(L)Cl] (M = Co, Fe, Cr; L = Schiff base ligand) have been studied in aqueous solutions. Measurements were run at constant temperature (25º C), constant ionic strength (0.20 M), and constant pH (7.0) under pseudo-first order conditions, in which the concentration of cysteine is around two orders of magnitude greater than that of metal complex. The observed rate constant was determined by following the change in absorbance of reaction mixture at a predetermined wavelength with time. Results show that the rate of oxidation depends on the type of metal center, with Co(III) complexes were found to have the highest rates due to higher reduction potential of Co(III). The oxidation rate was also found to depend on steric factor and the electron withdrawing / releasing ability of the ligand bound to the metal ion.

Microwave Assisted Synthesis and Characterisation of Trinuclear Zinc(II) Schiff Base Complexes Derived from m-phenylenediamine and Salicylaldehyde

2020 ◽  
Vol 14 (1) ◽  
pp. 29
Author(s):  
Karimah Kassim ◽  
Muhamad Azwan Hamali
Keyword(s):  
Schiff Base ◽  
1H Nmr ◽  
Metal Ion ◽  
Synthesis Method ◽  
Mononuclear Complex ◽  
Schiff Base Complexes ◽  
Trinuclear Complex ◽  
Microwave Assisted Synthesis ◽  
Infrared Band ◽  
Microwave Assisted

A series of Schiff base ligand, SALMPD, and its mono- and trinuclear Zn(II) metal complexes were synthesised from m-phenylenediamine and salicylaldehyde in alcoholic solution. The synthesis of ligand and mononuclear complex were synthesised using conventional condensation method, while the trinuclear complex was done using microwave-assisted synthesis method. The structure of each compound was elucidated by elemental analysis, infrared and 1H NMR spectroscopy. The infrared spectrum of SALMPD shows a strong azomethine (C=N) band at 1621.62cm-1, indicates the formation of the ligand. Upon complexation of the mononuclear complex, the C=N infrared band shifted and the disappearing of the phenolic hydrogen signal in 1H NMR suggesting the chelation between Zinc(II) metal ion and ligand took place when azomethine and phenolic hydrogen deprotonated.  The trinuclear complex, Zn3(SALMPD) obtained was consist of two moieties of mononuclear Zn(SALMPD), which act as ligands that chelating to the third Zn(II) metal ion through oxygen atom due to the shifting of M-O infrared band from 575.12-540.53cm-1, which serves as a coordination site for the metal ion.

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