scholarly journals Enhancement of Anticorrosive Performance of Renewable Cardanol Based Polyurethane Coatings by Incorporating Magnetic Hydroxyapatite Nanoparticles

2021 ◽  
Author(s):  
Afzal Haq Asif ◽  
Mahendra s Mahajan ◽  
Nagaraja Sreehar ◽  
Vikas Gite ◽  
Bandar Dhubiab ◽  
...  
Keyword(s):  
Structural Features ◽  
Spectroscopic Techniques ◽  
Hydroxyapatite Nanoparticles ◽  
Pencil Hardness ◽  
Optimum Result ◽  
H Nmr ◽  
Anticorrosive Coatings ◽  
Ft Ir ◽  
Hydrophobic Nature ◽  
Good Coating

Abstract The present investigation demonstrates renewable cardanol based polyol for the formulation of nanocomposite polyurethane (PU) coatings. The functional and structural features of cardanol polyol and nanoparticles were studied by FT-IR and 1H NMR spectroscopic techniques. The magnetic hydroxyapatite nanoparticles (MHAP) were dispersed in PU formulations to develop nanocomposite anticorrosive coatings. The amount of MHAP in PU formulations was varied from 1-5%, increase the percentage of MHAP increases the anticorrosive performance as examined by immersion and electrochemical methods. The nanocomposite PU coatings shows good coating properties viz., gloss, pencil hardness, flexibility, cross-cut adhesion and chemical resistance. Additionally, the coatings also studied for surface morphology, wetting, and thermal properties by scanning electron microscope (SEM), contact angle, and thermogravimetric analysis (TGA), respectively. The hydrophobic nature of PU coatings increased by addition of MHAP and optimum result (1050) was observed in 3% loading. The developed coatings revealed hydrophobic nature with excellent anticorrosive performance.

Synthesis and Characterization of Imidazo[1,2-a]Pyrimidine

2015 ◽  
Vol 52 ◽  
pp. 1-4
Author(s):  
A.M. Shah ◽  
A.J. Rojivadiya
Keyword(s):  
Mass Spectroscopy ◽  
Synthesis And Characterization ◽  
Spectroscopic Techniques ◽  
One Pot ◽  
H Nmr ◽  
Ft Ir ◽  
C Nmr

An efficient protocol for the synthesis of imidazo [1,2-a] pyrimidine was developed by using three component one-pot Biginelli synthesis. The synthesized compounds were characterized by spectroscopic techniques like FT-IR, 1H NMR, 13C NMR, and mass spectroscopy.

Quantitative Analysis of Polyacrylamide Grafted on Polylactide Film Surfaces Employing Spectroscopic Techniques

2017 ◽  
Vol 71 (11) ◽  
pp. 2457-2468
Author(s):  
Mijanur Rahman ◽  
Pakorn Opaprakasit
Keyword(s):  
Quantitative Analysis ◽  
Proton Nuclear Magnetic Resonance ◽  
Spectroscopic Techniques ◽  
H Nmr ◽  
Initiator System ◽  
Ft Ir ◽  
Time Ease ◽  
Standard Techniques ◽  
Good Agreement ◽  
Ft Ir Spectroscopy

Standard techniques for quantitative measurement of polyacrylamide (PAm) contents grafted on polylactide (PLA) film substrates, P(LA- g-Am- co-MBAm), which are commonly used as cell culture substrates or scaffolds, and pH-sensitive absorbents have been developed with X-ray photoelectron (XPS), proton-nuclear magnetic resonance (1H-NMR), and Fourier transform infrared (FT-IR) spectroscopy. The techniques are then applied to examine P(LA- g-Am- co-MBAm) samples prepared from two separate photo-initiator/co-initiator systems. Efficiency and accuracy of the techniques are compared. The results from all techniques are in good agreement, indicating high analysis precisions, although FT-IR technique provides additional advantages, in terms of short analysis time, ease of sample preparation, and accessibility of a machine. The results indicate that the riboflavin (RF) initiator system has higher grafting efficiency than its camphorquinone (CQ) counterpart. These standard techniques can be applied in the analysis of these materials and further modified for quantitative analysis of other grafting systems.

Nontemplate synthesis, characterization and theoretical study of tetraazamacrocycles

2012 ◽  
Vol 23 (1) ◽  
pp. 121-127
Author(s):  
İbrahim Șen ◽  
Cem Burak Yildiz ◽  
Akın Azizoğlu
Keyword(s):  
Density Functional ◽  
Basis Sets ◽  
Frontier Molecular Orbital ◽  
Spectroscopic Techniques ◽  
Functional Theory ◽  
Hartree Fock ◽  
H Nmr ◽  
Ft Ir ◽  
Molecular Electrostatic Potential Maps ◽  
C Nmr

Abstract The syntheses of new tetraaza macrocyclic compounds of variable ring sizes by non-template methods and their characterization with the help of elemental analysis and spectroscopic techniques (FT-IR, 1H-NMR, and 13C-NMR) have been reported in detail. The vibrational frequencies determined experimentally are compared with those obtained theoretically from density functional theory (DFT) and Hartree-Fock (HF) calculations. The comparisons between the experimental and theoretical results indicate that B3LYP level with both the 3-21G(d) and 6-31G+(d,p) basis sets is able to provide satisfactory results for predicting IR properties. The frontier molecular orbital diagrams and molecular electrostatic potential maps of title compounds have been also calculated and visualized at the B3LYP/6-31G+(d,p) level of theory.

Synthesis, X-ray characterization and catalytic homogenous alcohol oxidation activity of Co(II)–carboxamide complex with green oxidant (H2O2) under mild conditions

2020 ◽  
Vol 235 (6-7) ◽  
pp. 237-244
Author(s):  
Hakan Ünver
Keyword(s):  
Distorted Octahedral Geometry ◽  
Dimethyl Formamide ◽  
Spectroscopic Techniques ◽  
Oxidation Activity ◽  
X Ray ◽  
H Nmr ◽  
Mild Conditions ◽  
Counter Ions ◽  
Ft Ir ◽  
Homogenous Catalyst

AbstractIn this study, a new air and moisture stable mononuclear cobalt(II)–carboxamide complex, [Co(TCrbx)2(CH3OH)2](ClO4)2, was synthesized and characterized (TCrbx = N-(4-methylpyridin-2-yl)thiophene-2-carboxamide). Complex characterization mainly was done with single crystal X-ray analysis. Ligand characterization was done with several spectroscopic techniques (Elemental Analysis, FT-IR, 1H NMR, 13C NMR). Cobalt(II) complex possesses distorted octahedral geometry coordinated with two carboxamide ligands at equatorial and two methanol ligands at axial positions and two perchlorate anions as counter ions. Synthesized complex was successfully tested as homogenous catalyst for the oxidation of benzyl alcohol with environmental friendly oxidant hydrogen peroxide (H2O2) under mild conditions. Benzaldehyde was selectively obtained with the conversion value of 99.5% in dimethyl formamide after 3-h reaction time at 50 °C with 133 TON value. Solvent and temperature effects were also investigated.

Silicon(IV) phthalocyanine-biotin conjugates: Synthesis, photophysicochemical properties and in vitro biological activity for photodynamic therapy

2017 ◽  
Vol 21 (07n08) ◽  
pp. 547-554 ◽  
Author(s):  
Asuman Dakoğlu Gülmez ◽  
Meltem Göksel ◽  
Mahmut Durmuş
Keyword(s):  
Photodynamic Therapy ◽  
Quantum Yields ◽  
Spectroscopic Techniques ◽  
Oxygen Generation ◽  
Fluorescence Quantum Yields ◽  
H Nmr ◽  
Ft Ir ◽  
Human Cervical Cancer ◽  
Phthalocyanine Ring

Silicon (IV) phthalocyanines bearing one or two biotin groups on the axially positions were synthesized, and these novel phthalocyanines were characterized by elemental analysis and standard spectroscopic techniques such as FT-IR, [Formula: see text]H NMR, UV-vis and MALDI-TOF. The synthesized compounds are the first examples of axially biotin substituted silicon (IV) phthalocyanines. These phthalocyanines were designed as targeting photosensitizers for the treatment of cancer by photodynamic therapy (PDT) technique. The phthalocyanine ring was selected for its photosensitizer ability and the biotin group was selected as a targeting agent for increasing accumulation of these photosensitizers in tumor cells. The photophysical (fluorescence quantum yields and lifetimes) and photochemical (singlet oxygen generation) properties of the target silicon(IV) phthalocyanines were investigated in DMSO. The photosensitizing efficiency of the studied phthalocyanines was tested against human cervical cancer (HeLa) cells at different photosensitizer concentrations. Both axially mono- and bis-biotin substituted silicon(IV) phthalocyanines present high photocytotoxicity against HeLa cancer cells with the cell survival degree ranging from 13% to 50%. The photosensitivity and the intensity of damage were found to be directly related to the concentration of the used photosensitizers. According to the obtained results, both silicon(IV) phthalocyanine derivatives could be promising as photosensitizers for treatment of cancer by PDT technique.

scholarly journals Synthesis and Evaluation of Changes Induced by Solvent and Substituent in Electronic Absorption Spectra of New Azo Disperse Dyes Containig Barbiturate Ring

2013 ◽  
Vol 2013 ◽  
pp. 1-6 ◽  
Author(s):  
Hooshang Hamidian ◽  
Najmeh Zahedian ◽  
Dadkhoda Ghazanfari ◽  
Samieh Fozooni
Keyword(s):  
Aromatic Aldehyde ◽  
Electronic Absorption Spectra ◽  
Thiobarbituric Acid ◽  
Disperse Dyes ◽  
Spectroscopic Techniques ◽  
H Nmr ◽  
Ft Ir ◽  
Azo Disperse Dyes ◽  
C Nmr

Six azo disperse dyes were prepared by diazotizing 4-amino hippuric acid and coupled with barbituric acid and 2-thiobarbituric acid. Then, the products were reacted with aromatic aldehyde, sodium acetate, and acetic anhydride, and oxazolone derivatives were formed. Characterization of the dyes was carried out by using UV-Vis, FT-IR,1H NMR and13C NMR, and mass spectroscopic techniques. The solvatochromic behavior of azo disperse dyes was evaluated in various solvents. The effects of substituents of aromatic aldehyde, barbiturate, and thiobarbiturate ring on the color of dyes were investigated.

2,2,3,3-Tetrafluoropropoxy substituted oxo-titanium phthalocyanines axially ligated with common MALDI matrix materials

2013 ◽  
Vol 17 (06n07) ◽  
pp. 548-554 ◽  
Author(s):  
Deniz Kutlu Tarakci ◽  
İlke Gürol ◽  
Vefa Ahsen
Keyword(s):  
Chlorogenic Acid ◽  
Caffeic Acid ◽  
Elemental Analysis ◽  
Ellagic Acid ◽  
Donor Ligands ◽  
Spectroscopic Techniques ◽  
H Nmr ◽  
Oxygen Donor ◽  
Ft Ir ◽  
New Compounds

The synthesis of tetra and octa 2,2,3,3-tetrafluoropropoxy substituted oxo-titanium phthalocyanines (TiOPc) are reported. Using strongly chelating oxygen donor ligands, the reactions of TiOPc with catecholate (1a, 2a), 4-nitrocatecholate (1b, 2b) and caffeic acid (1c, 2c), ellagic acid (1d, 2d) and chlorogenic acid (1e, 2e) are described. The new compounds were characterized by mass, 1 H NMR, FT-IR, and UV-vis spectroscopic techniques as well as elemental analysis.

Five-nuclear phthalocyanine complex bearing terpyridine zinc complex: Synthesis, and photophysicochemical studies

2018 ◽  
Vol 22 (01n03) ◽  
pp. 181-188 ◽  
Author(s):  
Pinar Sen ◽  
S. Zeki Yildiz ◽  
Göknur Yasa Atmaca ◽  
Ali Erdogmus
Keyword(s):  
Mass Spectroscopy ◽  
Zinc Complex ◽  
Quantum Yields ◽  
Spectroscopic Techniques ◽  
Oxygen Production ◽  
Fluorescence Quantum Yields ◽  
H Nmr ◽  
Phthalocyanine Complex ◽  
Ft Ir ◽  
C Nmr

The context of this study is based on the synthesis of tetrakis{4-(2-([2,2[Formula: see text]:6[Formula: see text],2[Formula: see text]-terpyridine]Zn(II)-4[Formula: see text]-yl(methyl)amino)ethoxy)}phthalocyaninato zinc (II) (3) bearing four terpyridine-Zn(II) complexes that are directly linked through oxygen bridges to the macrocyclic core in order to create new supramolecular assemblies. The target phthalocyanine (3) was obtained by cyclotetramerization reaction of terpyridine-Zn (II) complex substituted phthalonitrile (2). All novel compounds synthesized in this study were fully characterized by general spectroscopic techniques such as FT-IR, UV-vis, and [Formula: see text]H-NMR, [Formula: see text]C-NMR, elemental analysis and mass spectroscopy. Spectral, photophysical (fluorescence quantum yields and lifetimes) and photochemical (singlet oxygen production and photodegradation under light irradiation) properties of newly synthesized phthalonitrile (2) and its phthalocyanine derivative (3) as five nuclear phthalocyanine were investigated in DMSO solutions.

scholarly journals Synthesis, characterization and electrochemistry of triethyl ammonium sulphate ionic liquid

2020 ◽  
Vol 0 (0) ◽  
Author(s):  
Jalal Khan ◽  
Sayyar Muhammad ◽  
Luqman Ali Shah ◽  
Javed Ali ◽  
Muhammad Ibrar ◽  
...  
Keyword(s):  
Ionic Liquid ◽  
Ionic Species ◽  
Spectroscopic Techniques ◽  
Protic Ionic Liquids ◽  
Protic Ionic Liquid ◽  
Oxide Layers ◽  
Onset Potential ◽  
H Nmr ◽  
Surface Electrochemistry ◽  
Ft Ir

AbstractProtic ionic liquids (PILs) being intrinsic proton conducting ionic species are considered as potential green electrolytes for study of electrocatalytic reactions and for fabrication of IL-based fuel cells (FCs) and batteries. We have prepared a sulfate anion based protic ionic liquid (PIL), triethylammonium sulfate (TEAS) through a reaction involving transfer of proton from H2SO4 to triethylamine (TEA). 1H NMR and FT-IR spectroscopic techniques were employed for confirmation of the synthesis of TEAS and water content of the PIL was quantified using coulometric Karl–Fischer (KF) titration. 1H NMR and FT-IR analysis confirm the synthesis of the PILs and KF-titration analysis shows that TEAS contains 1.43 w/w % water. Electrical conductivity of TEAS was determined at different temperatures showing that the PIL has excellent ionic conductivity that enhances with rise in temperature of the medium. The temperature dependence of the conductivity of the PIL follows the Arrhenius equation as the logσ versus 1/T plot is linear. The electrochemical windows (EWs) of the electrolyte were found using cyclic voltammetry at Pt and Au working electrodes and found to decrease with increase in temperature of the medium. The data revealed that the surfaces of the electrodes are covered with oxide layers due to oxidation of trace water (1.43 w/w %) present in the PIL. The oxide layers growth increase and their onset potential moves to less positive values as the temperature of the PILs is increased. The data was compared with the literature and would be helpful in understanding of the surface electrochemistry in this neoteric medium for being used as potential electrolyte in industry for various electrochemical applications.

scholarly journals A Green Approach to the Production of 2-pyridone Derivatives Promoted by Infrared Irradiation

2017 ◽  
Vol 58 (2) ◽  
Author(s):  
Fernando Hernández ◽  
Fabiola De la Cruz ◽  
Julio López ◽  
Eduardo Peña ◽  
Francisco Delgado ◽  
...  
Keyword(s):  
Spectroscopic Techniques ◽  
Infrared Irradiation ◽  
X Ray Diffraction ◽  
Reaction Conditions ◽  
X Ray ◽  
H Nmr ◽  
Green Approach ◽  
Ft Ir ◽  
Target Molecules ◽  
C Nmr

<p>An alternative is presented for promoting a reaction with infrared irradiation to obtain different 4-aryl-3-cyano-5-ethoxycarbonyl-6-methyl-2-pyridone derivatives <strong>9a-k</strong>. The process was carried out with a green approach from the corresponding 4<em>H</em>-pyrans, using mild reaction conditions and infrared irradiation as the energy source. In the first stage, the reaction produced 1,2,3,4-tetrahydropyridin-2-one derivatives <strong>8a-k</strong>, followed by an oxidative step to afford the target molecules in good yields. The structure of products <strong>9a-k</strong> was confirmed by FT-IR, <sup>1</sup>H NMR and <sup>13</sup>C NMR spectroscopic techniques and X-ray diffraction. It was found that the efficiency of the reaction depends on the catalyst and the solvent, as well as on the aldehyde substituents.</p>

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