Synthesis, DFT calculations and optical nonlinear properties of two derived Schiff base compounds from ethyl-4-amino benzoate

2021 ◽  
Author(s):  
Hasanain A. Abdullmajed ◽  
H. A. Sultan ◽  
Rafid H. Al-Asadi ◽  
Qusay Hassan ◽  
Asaad A. Ali ◽  
...  
Keyword(s):  
Schiff Base ◽  
Reasonable Agreement ◽  
Continuous Wave ◽  
Power Laser ◽  
Diffraction Ring ◽  
Nonlinear Properties ◽  
Optical Limiter ◽  
Ft Ir ◽  
Uv Visible ◽  
Experimental Findings

Abstract Two Schiff base compounds viz., Ethyl (E)-4-((3-ethoxy-2-hydroxybenzylidene)amino)benzoate(EHB) and Ethyl (E)-4-(((2-hydroxynaphthalen-1-yl)methylene)amino)benzoate(ENB) are synthesized by condensation of ethyl-4-amino benzoate with 2-hydroxy-3-ethoxy benzaldehyde and 2-hydroxy-1-naphthaldehyde. The two compounds are studied and identified by FT-IR, UV-visible, Mass, 1H-NMR and 13C-NMR spectroscopies. The nonlinear refractive index (NRI) of the two compounds are determined, for ENB compound via the diffraction ring patterns (DRPs) and the Z-scan and via Z-scan for the EHB compound, using continuous wave (cw) low power laser beam, and founds of the order of 10-7 cm2/W due to the first technique and 10-8 cm2/W due to the second technique. The optical limiting (OLg) property of both compounds is studied too with OLg thresholds of 16.5 mW and 11 mW for the compounds EHB and ENB respectively, which makes these two compounds as candidates to be used as an optical limiter (OLr). The DRPs are numerically simulated based on the theory of Fresnel-Kirchhoff with reasonable agreement compare to the experimental findings.

scholarly journals Synthesis, Characterisation, Antimicrobial activity and DNA Cleavage of (E)-2-((Tetrazolo[1,5-A]Quinolin-4- ylmethylene)Amino)Phenol Schiff base Metal complexes

2020 ◽  
Vol 13 (2) ◽  
pp. 29-37
Author(s):  
Anilkumar Ambala ◽  
Ch. Abraham Lincoln
Keyword(s):  
Antimicrobial Activity ◽  
Schiff Base ◽  
Metal Complexes ◽  
Dna Cleavage ◽  
Analytical Data ◽  
Amino Phenol ◽  
Ft Ir ◽  
Uv Visible ◽  
Schiff Base Metal Complexes

A series of novel (E)-2-((Tetrazolo[1,5-a]quinolin-4-ylmethylene)amino)phenol Cu(II), Co(II), Ni(II), Zn(II) and Mn (II) metal complexes have been synthesized 1:1 metal to ligand ratio, and these complexes were characterized by using analytical data such as FT-IR, UV-visible, Mass spectroscopy, SEM, EDX, TGA and magnetic moment measurements. The ligand and all the metal complexes were tested in vitro antimicrobial activity and DNA cleavage studies.

scholarly journals Molecular Structure and Spectral Characterization of Diamagnetic Co(III) Complex Incorporating Hexaadentate Schiff Base Ligand

2019 ◽  
Vol 31 (8) ◽  
pp. 1871-1876
Author(s):  
Eida S. Al-Farraj ◽  
Amani S. Alturiqi ◽  
Murefah M. Anazy ◽  
Reda A. Ammar
Keyword(s):  
Schiff Base ◽  
Schiff Base Ligand ◽  
Atomic Charge ◽  
Molar Ratio ◽  
Lumo Energy ◽  
Ft Ir ◽  
Uv Visible ◽  
Homo Lumo ◽  
Mulliken Atomic Charge

A novel Co(III) complex derived from hexaadentate Schiff base ligand, H3L was described. The ligand is prepared from the reaction of tris-2-aminoethyl amine and o-vanillin in 1:3 molar ratio. The structure of the ligand and its Co(III) complex was described by micro-analyses, FT-IR, NMR, ESI-MS and UV/visible and thermal stability. DFT study was carried out to get insights into the ligand and its Co(III) complex to compare the values of bond lengths and angles with each other. The electronic spectra, Mulliken atomic charge distribution, HOMO-LUMO energy and the thermodynamic parameters have been calculated.

scholarly journals Preparation and Characterization of the Schiff Base Ligand (E)- N-(3-nitrobenzylidene) isonicotinohydrazide and its Silver (I) Complex [Ag(NNBIH)2]+

2012 ◽  
Vol 9 (2) ◽  
pp. 191-195
Author(s):  
SHAHRIAR GHAMMAMY ◽  
SAJJAD SEDAGHAT
Keyword(s):  
Thermal Decomposition ◽  
Schiff Base ◽  
Schiff Base Ligand ◽  
Synthesis And Characterization ◽  
Nitrate Salt ◽  
Visible Spectroscopy ◽  
Multistage Processes ◽  
Ft Ir ◽  
Uv Visible

We describe the synthesis and characterization of a new silver (I) complex of the Schiff base ligand (E) - N-(3-nitrobenzylidene) is onicotinohydrazide that abbreviated as NNBIH was synthesized and characterized. Ag (I) Metal complex of this Schiff base ligand prepared by reaction of nitrate salt of Ag (I) with NNBIH. Characterization of the ligand was made by microanalyses, FT-IR, UV–Visible spectroscopy and its complex was made by microanalyses, FT-IR and UV–Visible spectroscopy. TG- DTA and other analytical methods have been applied to the investigation of the thermal behavior and Structure of the compound [Ag(NNBIH)2]+. Thermal decomposition of these compounds is multistage processes.

scholarly journals Chemical Synthesis, Spectral Characterization and Antitumor Activity of Co(II), Zn(II) and Ni(II) Complexes Derived from Thiazole-based Schiff Base Ligand

2021 ◽  
Vol 10 (3) ◽  
pp. 2546-2556
Keyword(s):  
Schiff Base ◽  
Metal Complexes ◽  
Schiff Base Ligand ◽  
Molecular Structures ◽  
Schiff Base Complexes ◽  
Molar Ratio ◽  
Visible Absorption ◽  
Ic50 Values ◽  
Ft Ir ◽  
Uv Visible

The present study deals with the synthesis of a new Schiff base ligand, 4-(((4-chlorobenzo[d]thiazol-2-yl)imino)methyl)-2-methoxyphenol (HL) derived from the condensation of 2-Amino-4-chlorobenzothiazole and 4-Hydroxy-3-methoxybenzaldehyde, and its Co(II), Zn(II) and Ni(II) complexes in 2:1 molar ratio (2HL:M). The Schiff base ligand and its metal complexes were characterized using FT-IR, UV-Visible absorption, mass spectra, and TGA techniques. The spectral analysis results confirmed the molecular structures of the Schiff base ligand and its metal complexes. Further, the metallic Schiff base complexes showed significant growth inhibition in the adenocarcinoma human alveolar basal epithelial cells, A549, with the Co(II), Zn(II), and Ni(II) complexes having IC50 values of 40.78, 42.04, and 44.69 M, respectively.

scholarly journals Synthesis, characterization and antibacterial studies of Mn(II) and Co(II) complexes of an ionic liquid tagged Schiff base

2016 ◽  
Vol 81 (10) ◽  
pp. 1151-1159 ◽  
Author(s):  
Sanjoy Saha ◽  
Ananya Das ◽  
Kaushik Acharjee ◽  
Biswajit Sinha
Keyword(s):  
Escherichia Coli ◽  
Ionic Liquid ◽  
Schiff Base ◽  
Antibacterial Activities ◽  
Spectroscopic Methods ◽  
Tetrahedral Geometry ◽  
Antibacterial Studies ◽  
Ft Ir ◽  
Uv Visible

Mn(II) and Co(II) complexes of an ionic liquid-based Schiff base, 1-{2-(2-hydroxybenzylideneamino)ethyl}-3-methylimidazolium bromide, were synthesized and characterized by various analytical and spectroscopic methods such as elemental analysis, UV-Visible, FT-IR, 1H NMR, ESI-MS and magnetic susceptibility measurement. These studies indicated tetrahedral geometry for the complexes. The Schiff base ligand and its complexes were tested for in vitro antibacterial activities to assess their inhibiting potentials against Escherichia coli and Lactobacillus sp.

scholarly journals Efficient Catalytic Reduction of 4-Nitrophenol Using Copper(II) Complexes with N,O-Chelating Schiff Base Ligands

Molecules ◽  
2021 ◽  
Vol 26 (19) ◽  
pp. 5876
Author(s):  
Hassan Wafi Garba ◽  
Muhammad Sabiu Abdullahi ◽  
Mohamad Shazwan Shah Jamil ◽  
Nor Azam Endot
Keyword(s):  
Schiff Base ◽  
Catalytic Activity ◽  
Catalytic Reduction ◽  
Schiff Base Ligands ◽  
Paramagnetic Resonance ◽  
Nitrophenol Reduction ◽  
Ft Ir ◽  
Uv Visible ◽  
Electron Paramagnetic ◽  
Excellent Reproducibility

The reduction of 4-nitrophenol to 4-aminophenol by sodium borohydride was used as a model to test the catalytic activity of copper(II) complexes containing N,O-chelating Schiff base ligands. In this study, a series of copper(II) complexes containing respective Schiff base ligands, N′-salicylidene-2-aminophenol (1), N′-salicylidene-2-aminothiazole (2), and N,N′-bis(salicylidene)-o-phenylenediamine (3), were synthesized and characterized by elemental analysis, Fourier transform infrared (FT-IR), and UV-Visible (UV-Vis) and electron paramagnetic resonance (EPR) spectroscopies. The results from the 4-nitrophenol reduction showed that 3 has the highest catalytic activities with 97.5% conversion, followed by 2 and 1 with 95.2% and 90.8% conversions, respectively. The optimization of the catalyst amount revealed that 1.0 mol% of the catalyst was the most optimized amount with the highest conversion compared to the other doses, 0.5 mol% and 1.5 mol%. Recyclability and reproducibility tests confirmed that all three complexes were active, efficient, and possess excellent reproducibility with consistent catalytic performances and could be used again without a major decrease in the catalytic activity.

scholarly journals Effect of methyl substituent on the solubility of 1,4-benzoquinone derivatives in n-octanol/water system

2020 ◽  
Vol 23 (5) ◽  
pp. 142-146
Author(s):  
Siti Mariyah Ulfa ◽  
Fath Dwisari ◽  
Ade Cintyia Sally ◽  
Mohammad Farid Rahman
Keyword(s):  
Shake Flask ◽  
Water System ◽  
Insertion Reaction ◽  
Log P ◽  
Methyl Substituent ◽  
Promising Candidate ◽  
New Drug ◽  
Alkyl Bromides ◽  
Ft Ir ◽  
Uv Visible

The solubility of the compound is a crucial task for new drug design. Quinone is a promising candidate to develop as a new drug. In this research, the synthesis of 1,4-benzoquinone derivatives, that is, 2-(5-bromoamyl)-3,5-dimethyl-1,4-benzoquinone (2a) and 2-(5-bromoamyl)-5-methyl-1,4-benzoquinone (2b) were carried out by decarboxylation and insertion reaction of alkyl bromides. The product 2a and 2b are purified using SiO2 gel column chromatography and analyzed by UV-Visible, FT-IR, and NMR. The yield of 2a is 13.75%, and 2b is 4.04%. The solubility of 2a and 2b, expressed by log P, is measured in the n-octanol/water (3:7 (v/v)) system by the shake flask method. The log P of 2a and 2b are 2.99 and 1.36, respectively. It is showed that the log P of 2a is higher compared to 2b. The presence of two methyl substituents on the quinone ring of 2a supports the increase of hydrophobicity of the compound in the n-octanol/water system.

Synthesis of N2, N6-bis(5-methylthiazol-2-yl)pyridine-2,6-dicarboxamide fluoroscent sensor for detection of Cu2+ and Ni2+ Ions

Drug Research ◽  
2021 ◽  
Author(s):  
Anuroop Kumar ◽  
Netrapal Singh ◽  
Mordhwaj Kumar ◽  
Uma Agarwal
Keyword(s):  
Spectral Analysis ◽  
Detection Limit ◽  
Metal Ions ◽  
1H Nmr Spectroscopy ◽  
Stoichiometric Ratio ◽  
Selective Detection ◽  
Ft Ir ◽  
Uv Visible ◽  
Complexes With Metal Ions ◽  
Competitive Ions

AbstractThis article reports an amide based Chemosensor used for selective detection of divalent Cu+2 and Ni+2 ions via Fluorescence turn off. The selective sensing ability of Chemosensor was investigated in presence of different metal ions Mg2+, Ag+, Fe2+, K+, Cu2+, Ni2+, Hg2+, Pb2+, Mn2+, Pd2+, Cd2+ and Mn3+ as competitive ions. The receptor i. e. Chemosensor formed complexes with metal ions in 1:1 stoichiometric ratio. The detection limit and binding constant calculated as 1.92×10–4 and 1.4×10–4 M and 2.16×103 M−1 and 3.09×103 M−1 for Cu2+ and Ni2+ions respectively. The complexes were characterized by UV/visible, FT-IR, 13C NMR and 1H NMR spectroscopy. Further the structure and Crystallinity were calculated by P-XRD spectral analysis. The crystallinity found to be 65.27 and 67.87% respectively

scholarly journals Synthesis and Structural Characterization of (E)-4-[(2-Hydroxy-3-methoxybenzylidene)amino]butanoic Acid and Its Novel Cu(II) Complex

Molbank ◽  
10.3390/m1179 ◽  
2021 ◽  
Vol 2021 (1) ◽  
pp. M1179
Author(s):  
Eleftherios Halevas ◽  
Antonios Hatzidimitriou ◽  
Barbara Mavroidi ◽  
Marina Sagnou ◽  
Maria Pelecanou ◽  
...  
Keyword(s):  
Schiff Base ◽  
Gamma Aminobutyric Acid ◽  
X Ray Diffraction ◽  
Reaction Conditions ◽  
Polymeric Compound ◽  
Bridging Ligands ◽  
1H And 13C Nmr ◽  
One Dimensional ◽  
Ft Ir

A novel Cu(II) complex based on the Schiff base obtained by the condensation of ortho-vanillin with gamma-aminobutyric acid was synthesized. The compounds are physico-chemically characterized by elemental analysis, HR-ESI-MS, FT-IR, and UV-Vis. The complex and the Schiff base ligand are further structurally identified by single crystal X-ray diffraction and 1H and 13C-NMR, respectively. The results suggest that the Schiff base are synthesized in excellent yield under mild reaction conditions in the presence of glacial acetic acid and the crystal structure of its Cu(II) complex reflects an one-dimensional polymeric compound. The molecular structure of the complex consists of a Cu(II) ion bound to two singly deprotonated Schiff base bridging ligands that form a CuN2O4 chelation environment, and a coordination sphere with a disordered octahedral geometry.

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