scholarly journals Synthesis, crystal structures and spectroscopic investigation of new Cu/Schiff-base complexes

2014 ◽  
Vol 10 (8) ◽  
pp. 3068-3079
Author(s):  
Ahmed Toumi ◽  
Mohamed Rzaigui ◽  
Hichem Ben Jannet
Keyword(s):  
Schiff Base ◽  
Solid State ◽  
Copper Complexes ◽  
Spectroscopic Properties ◽  
Schiff Base Complexes ◽  
X Ray Diffraction ◽  
Neutral Complex ◽  
Schiff Base Ligands ◽  
1H And 13C Nmr ◽  
Solid State Structures

Three novel Copper complexes, [Cu(L1)2][CuCl2] (1),  [Cu(L2)Cl] (2) and [Cu2(L3)3Cl2] (3), have been prepared by reaction of CuCl with the Schiff-base ligands L1: N,N’-bis(thiophen-2-ylmethylene)-ethane-1,2-diamine, L2: N,N’-bis(1H-pyrrol-2-ylmethylene)ethane-1,2-diamine and L3: N,N’-bis(2-nitrobenzylidene)-ethane-1,2-diamine in acetonitrile. The solid-state structures of these complexes were determined by X-ray diffraction from single crystal data and characterized by 1H and 13C NMR, IR and UV/Vis spectroscopies. This study shows that (1) is an ionic complex with a Cu(I)-centered cation and an isolated linear dichlorocuprate(I) anion, (3) is a dinuclear neutral complex of Cu(I) while (2)  is a mononuclear neutral complex of Cu(II). In the three complexes, Cu is tetracordinated in different geometrical environments. The atomic arrangements and spectroscopic properties of the three complexes are reported. Complexes 1-3 exhibit, in the solid state at room temperature, photoluminescence between 320 and 550 nm.

scholarly journals H-bonded Chains and Networks: A Recurring Feature in the Solid State Structures of Manganese (III) Carboxylate Schiff Base Complexes

2013 ◽  
Vol 12 (2) ◽  
pp. 8-20
Author(s):  
Biny Sasi ◽  
Swathy S ◽  
Thampidas V S ◽  
Pike D Robert
Keyword(s):  
Schiff Base ◽  
Solid State ◽  
Single Crystal ◽  
Schiff Base Complexes ◽  
X Ray Diffraction ◽  
X Ray ◽  
Distorted Octahedral ◽  
Jahn Teller ◽  
Solid State Structures

Two new manganese(III) Schiff base complexes,  [Mn(salen)(m-NO2-C6H4CO2)(H2O)] (1) and  [Mn(msalen) (p-OH-C6H4CO2)(H2O)] (2), where H2salen = N,N'-bis(salicylidene)-1,2-diaminoethane, H2msalen = N,N'-bis (3-methoxysalicylidene)-1,2-diaminoethane were synthesized from the manganese (II) carboxylates.  Single crystal X-ray diffraction studies show that the Jahn-Teller distorted octahedral complexes are stabilized by              H-bonded chains and networks in the solid state.  

New Copper Compounds with Antiplatelet Aggregation Activity

2019 ◽  
Vol 15 (8) ◽  
pp. 850-862
Author(s):  
Mirthala Flores-García ◽  
Juan Manuel Fernández-G. ◽  
Cristina Busqueta-Griera ◽  
Elizabeth Gómez ◽  
Simón Hernández-Ortega ◽  
...  
Keyword(s):  
Schiff Base ◽  
Solid State ◽  
Thrombotic Event ◽  
X Ray Diffraction ◽  
Nmr Studies ◽  
Schiff Base Ligands ◽  
X Ray ◽  
Antiplatelet Aggregation ◽  
Aggregation Activity ◽  
L1 And L2

Background: Ischemic heart disease, cerebrovascular accident, and venous thromboembolism have the presence of a thrombotic event in common and represent the most common causes of death within the population. Objective: Since Schiff base copper(II) complexes are able to interact with polyphosphates (PolyP), a procoagulant and potentially prothrombotic platelet agent, we investigated the antiplatelet aggregating properties of two novel tridentate Schiff base ligands and their corresponding copper( II) complexes. Methods: The Schiff base ligands (L1) and (L2), as well as their corresponding copper(II) complexes (C1) and (C2), were synthesized and characterized by chemical analysis, X-ray diffraction, mass spectrometry, and UV-Visible, IR and far IR spectroscopy. In addition, EPR studies were carried out for (C1) and (C2), while (L1) and (L2) were further analyzed by 1H and 13C NMR. Tests for antiplatelet aggregation activities of all of the four compounds were conducted. Results: X-ray diffraction studies show that (L1) and (L2) exist in the enol-imine tautomeric form with a strong intramolecular hydrogen bond. NMR studies show that both ligands are found as enol-imine tautomers in CDCl3 solution. In the solid state, the geometry around the copper(II) ion in both (C1) and (C2) is square planar. EPR spectra suggest that the geometry of the complexes is similar to that observed in the solid state by X-ray crystallography. Compound (C2) exhibited the strongest antiplatelet aggregation activity. Conclusion: Schiff base copper(II) complexes, which are attracting increasing interest, could represent a new approach to treat thrombosis by blocking the activity of PolyP with a potential anticoagulant activity and, most importantly, demonstrating no adverse bleeding events.

SYNTHESIS, SPECTROSCOPIC INVESTIGATION AND CATALYTIC STUDIES OF NICKEL(II) AROMATIC AZOMETHINE COMPLEXES

2018 ◽  
Vol 80 (2) ◽  
Author(s):  
Shahrul Nizam Ahmad ◽  
Hadariah Bahron ◽  
Amalina Mohd Tajuddin ◽  
Syed Abdul Illah Alyahya Syed Abd Kadir
Keyword(s):  
Schiff Base ◽  
Aryl Halide ◽  
Coupling Reaction ◽  
Schiff Base Complexes ◽  
Sonogashira Reaction ◽  
Schiff Base Ligands ◽  
1H And 13C Nmr ◽  
Spectral Techniques ◽  
Chemical Structures ◽  
Sonogashira Coupling Reaction

Coupling reaction between aryl halide and terminal alkyne in Sonogashira coupling reaction is important due to its extensive application in the resynthesis of natural products, production of drugs, dyes, and polymers. Efforts to increase rate of reaction has involved exploration of new catalysts. The current catalysts such as phosphine-based complexes are costly, air-sensitive and environmentally harmful. Nickel(II) Schiff base complexes were synthesized by reacting aromatic Schiff base ligands 2,2'-((1E,1'E)-(1,2-phenylenebis(azanylylidene))bis(metha-nylylidene))diphenol (L1H), 2,2'-((1E,1'E)-(1,2-phenylenebis(azanylylidene))bis(methanylylidene))bis(4-fluorophenol) (L1F), and 2,2'-((1E,1'E)-(1,2-phenylenebis(azanylylidene))bis-(methanylylidene))bis(4-methylphenol) (L1M) with nickel(II) acetate tetrahydrate to form NiL1H, NiL1F and NiL1M. The chemical structures were elucidated through physicochemical and spectral techniques namely elemental analysis, melting point, FTIR, 1H and 13C NMR, magnetic susceptibility and molar conductivity. All nickel(II) complexes were tested as catalysts in homogenous Sonogashira reaction between iodobenzene and phenylacetylene in DMSO for 12 hours at 140 oC. NiLF, a new nickel(II) complex, converted the highest percentage of iodobenzene (91%) while NiLH and NiLC converted 78% and 83% of iodobenzene, respectively. 

Copper(II) Complexes of a Tripyridyl Ligand: Anion-Dependent Metallosupramolecular Structures

2013 ◽  
Vol 66 (11) ◽  
pp. 1447 ◽  
Author(s):  
James E. M. Lewis ◽  
James D. Crowley
Keyword(s):  
Mass Spectrometry ◽  
Solid State ◽  
Coordination Polymer ◽  
Elemental Analysis ◽  
Spectroscopic Properties ◽  
Nitrate Salt ◽  
X Ray Diffraction ◽  
X Ray ◽  
Salt Structure ◽  
Solid State Structures

A series of copper(ii) complexes of the ligand 2,6-bis(pyridin-3-ylethynyl)pyridine have been synthesised and characterised by 1H and DOSY NMR, IR and UV-Vis spectroscopies, mass spectrometry, elemental analysis and single crystal X-ray diffraction. In solution these systems display almost identical spectroscopic properties, however the solid state structures are shown to vary widely, depending upon the choice of anion. The tetrafluoroborate salt was revealed to be a discrete Cu2L4 cage-like helicate. The tosylate salt, whilst of the same Cu2L4 stoichiometry, was shown to be a coordination polymer. Finally the nitrate salt structure was observed to be a discrete Cu2L2 metallocycle.

Syntheses, crystal structures and density functional theory investigations of copper(ii) complexes bearing tridentate Schiff base ligands derived from 8-aminoquinoline

CrystEngComm ◽  
2015 ◽  
Vol 17 (30) ◽  
pp. 5664-5671 ◽  
Author(s):  
Prasanta Kumar Bhaumik ◽  
Antonio Bauzá ◽  
Michael G. B. Drew ◽  
Antonio Frontera ◽  
Shouvik Chattopadhyay
Keyword(s):  
Density Functional Theory ◽  
Schiff Base ◽  
Solid State ◽  
Dft Calculations ◽  
Crystal Structures ◽  
Density Functional ◽  
Schiff Base Complexes ◽  
Schiff Base Ligands ◽  
Functional Theory ◽  
Tridentate Schiff Base

Three copper(ii) Schiff base complexes have been synthesized and characterized. Supramolecular assemblies in the solid state are analyzed by DFT calculations.

scholarly journals Solid-State Nonlinear Optical Properties of Mononuclear Copper(II) Complexes with Chiral Tridentate and Tetradentate Schiff Base Ligands

Materials ◽  
2019 ◽  
Vol 12 (21) ◽  
pp. 3595 ◽  
Author(s):  
Luca Rigamonti ◽  
Alessandra Forni ◽  
Elena Cariati ◽  
Gianluca Malavasi ◽  
Alessandro Pasini
Keyword(s):  
Schiff Base ◽  
Solid State ◽  
Nonlinear Optical ◽  
Charge Asymmetry ◽  
X Ray Diffraction ◽  
Schiff Base Ligands ◽  
Tetradentate Schiff Base ◽  
Uv Visible ◽  
Electric Susceptibility ◽  
Transfer Properties

Salen-type metal complexes have been actively studied for their nonlinear optical (NLO) properties, and push-pull compounds with charge asymmetry generated by electron releasing and withdrawing groups have shown promising results. As a continuation of our research in this field and aiming at solid-state features, herein we report on the synthesis of mononuclear copper(II) derivatives bearing either tridentate N2O Schiff bases L(a−c)− and pyridine as the forth ancillary ligand, [Cu(La−c)(py)](ClO4) (1a–c), or unsymmetrically-substituted push-pull tetradentate N2O2 Schiff base ligands, [Cu(5-A-5′-D-saldpen/chxn)] (2a–c), both derived from 5-substituted salicylaldehydes (sal) and the diamines (1R,2R)-1,2-diphenylethanediamine (dpen) and (1S,2S)-1,2-diaminocyclohexane (chxn). All compounds were characterized through elemental analysis, infrared and UV/visible spectroscopies, and mass spectrometry in order to guarantee their purity and assess their charge transfer properties. The structures of 1a–c were determined via single-crystal X-ray diffraction studies. The geometries of cations of 1a–c and of molecules 2a–c were optimized through DFT calculations. The solid-state NLO behavior was measured by the Kurtz–Perry powder technique @1.907 µm. All chiral derivatives possess non-zero quadratic electric susceptibility (χ(2)) and an efficiency of about 0.15–0.45 times that of standard urea.

scholarly journals Analysis of energies of halogen and hydrogen bonding interactions in the solid state structures of vanadyl Schiff base complexes

RSC Advances ◽  
2019 ◽  
Vol 9 (9) ◽  
pp. 4789-4796 ◽  
Author(s):  
Snehasish Thakur ◽  
Michael G. B. Drew ◽  
Antonio Franconetti ◽  
Antonio Frontera ◽  
Shouvik Chattopadhyay
Keyword(s):  
Hydrogen Bonding ◽  
Schiff Base ◽  
Solid State ◽  
Dft Calculations ◽  
Schiff Base Complexes ◽  
Supramolecular Interactions ◽  
Computational Tool ◽  
Hydrogen Bonding Interactions ◽  
Solid State Structures

Four vanadyl Schiff base complexes have been prepared and characterized. Energies of supramolecular interactions in complexes 1, 2 and 3 were estimated using DFT calculations, and further corroborated with NCI plot index computational tool.

Steric influence of salicylaldehyde-based Schiff base ligands on the formation of trans-[Re(PR3)2(Schiff base)]+ complexes

2019 ◽  
Vol 48 (34) ◽  
pp. 12943-12955
Author(s):  
Jakob E. Baumeister ◽  
Andrew W. Mitchell ◽  
Steven P. Kelley ◽  
Charles L. Barnes ◽  
Silvia S. Jurisson
Keyword(s):  
Schiff Base ◽  
Single Crystal ◽  
Schiff Base Complexes ◽  
Steric Effects ◽  
X Ray Diffraction ◽  
Schiff Base Ligands ◽  
X Ray ◽  
Steric Influence

The steric effects of backbone groups on the synthesis and stability of trans-[Re(PR3)2(Schiff base)]+ compounds were assessed using NMR, HPLC, electrochemistry and single crystal X-ray diffraction.

Copper(II) complexes with tridentate halogen‐substituted Schiff base ligands: synthesis, crystal structures and investigating the effect of halogenation, leaving group and ligand flexibility on antiproliferative activities

2021 ◽  
Author(s):  
Nazanin Kordestani ◽  
Hadi Amiri Rudbari ◽  
Alexandra R Fernandes ◽  
Luís R Raposo ◽  
André Luz ◽  
...  
Keyword(s):  
Schiff Base ◽  
Anticancer Activity ◽  
Crystal Structures ◽  
Copper Complexes ◽  
Schiff Base Ligands ◽  
Leaving Group ◽  
Leaving Groups ◽  
Tridentate Schiff Base ◽  
Antiproliferative Activities

To investigate the effect of different halogen substituents, leaving groups and the flexibility of ligand on the anticancer activity of copper complexes, sixteen copper(II) complexes with eight different tridentate Schiff-base...

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