scholarly journals Complexation of Oxovanadium(IV) and Dioxouranium(VI) with Synthesized 1,2-(Diimino-4′-antipyrinyl)-1,2-diphenylethane Schiff Base: A Thermodynamic, Kinetic, and Bioactivity Investigation

2014 ◽  
Vol 2014 ◽  
pp. 1-11 ◽  
Author(s):  
Shabnum Bashir ◽  
Syed Raashid Maqsood ◽  
Ghulam Mustafa Peerzada ◽  
Badruddin Khan ◽  
Masood Ahmad Rizvi
Keyword(s):  
Schiff Base ◽  
Schiff Base Ligand ◽  
Metal Ion ◽  
Kinetic Studies ◽  
Solution Phase ◽  
Complexation Reaction ◽  
Tetradentate Schiff Base ◽  
Electroanalytical Method ◽  
Synthetic Methodologies

We report the comparative synthetic methodologies and characterization of a tetradentate Schiff base ligand 1,2-(diimino-4′-antipyrinyl)-1,2-diphenylethane (DE). The target synthesis of oxovanadium(IV) and dioxouranium(VI) complexes (vanadyl and uranyl) with the (DE) ligand was also attempted to envisage the effect of metal ion steric factor on complexation process through solution phase thermodynamic and kinetic studies. The thermodynamic stabilities of synthesized vanadyl and uranyl (DE) complexes are discussed in light of their solution phase thermodynamic stability constants obtained by electroanalytical method. A comparative kinetic profile of vanadyl and uranyl complexation with DE is also reported. The complexation reaction proceeds with an overall 2nd order kinetics with both metal ions. Temperature dependent studies of rate constants present an activation energy barrier of ca. 40.913 and 48.661 KJ mol−1, for vanadyl and uranyl complexation, respectively, highlighting the metal ion steric and ligand preorganization effects. The synthesized Schiff base ligand and its vanadyl and uranyl complexes were screened for biocidal potential as antibacterial, antifungal, and anthelmintic agents with the results compared to corresponding reference drugs.

Synthesis, Characterization and Emission Properties of a Mixed Metal Complex of Europium (III) and Terbium (III) with a Tripodal Heptadentate Schiff Base Ligand

2012 ◽  
Vol 463-464 ◽  
pp. 326-330
Author(s):  
Masatoshi Kanesato ◽  
Keiko Nagahara ◽  
Midori Goto
Keyword(s):  
Schiff Base ◽  
Metal Complex ◽  
Schiff Base Ligand ◽  
Metal Ion ◽  
Uv Light ◽  
Green Emission ◽  
Crystal Structure Analysis ◽  
Mixed Metal ◽  
X Ray Crystallography

The preparation and characterization of a novel mixed metal complex of europium (III) and terbium (III) of a tripodal heptadentate Schiff-base ligand N [CH2CH2N=CH (2-OH-3-MeC6H3)]3 (H3L1) have been studied. The complex was prepared by the reaction of [EuL1] and [TbL1] in N, N-dimethylformamide. The ratio of europium (III) to terbium (III) in the mixed metal complex was found to be 3 to 7. The molecular structure of [Eu0.3Tb0.7L1] was determined by X-ray crystallography. The crystal structure analysis revealed that the Schiff-base behaves as a tri-deprotonated heptadentate ligand encapsulating the each metal ion within the N4O3 cavity. Under the excitation of UV light, the solid state of the complex exhibited red emission corresponding to europium (III) ion. The emission bands of 5D0 → 7Fj (j = 2, 3, 4) were observed at 609, 652, and 706 nm, respectively. On the other hand, the green emission corresponding to terbium (III) ion was not observed.

Electrochemical Synthesis and Characterization of Zinc(II) and Cadmium(II) Complexes of Dianionic Tetradentate Schiff Base Ligand

2007 ◽  
Vol 633 (11-12) ◽  
pp. 1832-1836 ◽  
Author(s):  
Laura Rodríguez ◽  
Elena Labisbal ◽  
Antonio Sousa-Pedrares ◽  
Jaime Romero ◽  
José-Arturo García Vázquez ◽  
...  
Keyword(s):  
Schiff Base ◽  
Schiff Base Ligand ◽  
Electrochemical Synthesis ◽  
Synthesis And Characterization ◽  
Tetradentate Schiff Base

scholarly journals Synthesis, Physical Characterization of M(III) Transition Metal Complexes Derived from Thiodihydrazide and 5-tert-Butyl-2-hydroxy-3-(3-phenylpent-3-yl) Benzaldehyde

2012 ◽  
Vol 9 (4) ◽  
pp. 2119-2127 ◽  
Author(s):  
Gajendra Kumar ◽  
Rajeev Johari ◽  
Shoma Devi
Keyword(s):  
Schiff Base ◽  
Metal Complexes ◽  
Schiff Base Ligand ◽  
Metal Ion ◽  
Magnetic Measurements ◽  
Metal Salt ◽  
Magnetic Moments ◽  
Metal Centers ◽  
H Nmr

A Schiff base ligand was synthesized by reacting 5-tert-butl-2-hydroxy-3-(3-phenylpent-3-yl) benzaldehyde and thiodihydrazide (2:1) and a series of metal complexes with this new ligand were synthesized by reaction with Cr (III), Mn (III), and Fe (III) metal salt in methanolic medium. The Schiff base ligand and its complexes have been characterized with the help of elemental analysis, conductance measurements, magnetic measurements and their structure configuration have been determined by various spectroscopic (electronic, IR,1H NMR,13C NMR, GCMS) techniques. Electronic and magnetic moments of the complexes indicate that the geometries of the metal centers were octahedral. IR spectral data suggest that ligand behaves as a tetradentate ligand with ONNO donor sequence towards the metal ion.

On the importance of RH3C•••N tetrel bonding interactions in the solid state of a dinuclear zinc complex with a tetradentate Schiff base ligand

CrystEngComm ◽  
2021 ◽  
Author(s):  
IPSITA MONDAL ◽  
Antonio Frontera ◽  
Shouvik Chattopadhyay
Keyword(s):  
Schiff Base ◽  
Solid State ◽  
Schiff Base Ligand ◽  
Zinc Complex ◽  
X Ray ◽  
Tetradentate Schiff Base

The synthesis and X-ray characterization of a new dinuclear Zn complex using a tetradentate N2O2 donor Schiff base and azide as anionic co-ligand of formula [(DMSO)2ZnL(µ1,1-N3)Zn(N3)2] (1) is reported herein....

scholarly journals Synthesis, characterization and thermal study of some transition metal complexes of an asymmetrical tetradentate Schiff base ligand

2010 ◽  
Vol 75 (3) ◽  
pp. 349-359 ◽  
Author(s):  
Achut Munde ◽  
Amarnath Jagdale ◽  
Sarika Jadhav ◽  
Trimbak Chondhekar
Keyword(s):  
Schiff Base ◽  
Metal Complexes ◽  
Schiff Base Ligand ◽  
Metal Ion ◽  
Trichoderma Viride ◽  
Planar Geometry ◽  
Central Metal ◽  
X Ray Diffraction ◽  
X Ray ◽  
Tetradentate Schiff Base

Complexes of Cu(II), Ni(II), Co(II), Mn(II) and Fe(II) with an asymmetric tetradentate Schiff base ligand derived from dehydroacetic acid, 4-methyl- o-phenylenediamine and salicylic aldehyde were synthesized and characterized by elemental analysis, conductometry, magnetic susceptibility, UV-Vis, IR, 1H-NMR spectroscopy, X-ray diffraction analysis of powdered samples and thermal analysis, and screened for antimicrobial activity. The IR spectral data suggested that the ligand behaves as a dibasic tetadentate ligand towards the central metal ion with an ONNO donor atoms sequence. From the microanalytical data, the stoichiometry of the complexes 1:1 (metal:ligand) was found. The physico-chemical data suggested square planar geometry for the Cu(II) and Ni(II) complexes and octahedral geometry for the Co(II), Mn(II) and Fe(II) complexes. The thermal behaviour (TGA/DTA) of the complexes was studied and kinetic parameters were determined by Horowitz-Metzger and Coats-Redfern methods. The powder X-ray diffraction data suggested a monoclinic crystal system for the Co(II), Mn(II) and Fe(II) complexes. The ligand and their metal complexes were screened for antibacterial activity against Staphylococcus aureus and Escherichia coli and fungicidal activity against Aspergillus niger and Trichoderma viride.

Synthesis and structural characterization of metal complexes of an unsymmetric N3O tetradentate Schiff base ligand

1998 ◽  
Vol 279 (1) ◽  
pp. 111-115 ◽  
Author(s):  
Greg Brewer ◽  
Peter Kamaras ◽  
Leopold May ◽  
Sergey Prytkov ◽  
Miroslav Rapta
Keyword(s):  
Schiff Base ◽  
Metal Complexes ◽  
Structural Characterization ◽  
Schiff Base Ligand ◽  
Tetradentate Schiff Base
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