A Highly Selective Chemosensor for Naked-Eye Detection of Fluoride and Aluminium(III) Ions Based on a New Schiff Base Derivative

2016 ◽  
Vol 69 (8) ◽  
pp. 911 ◽  
Author(s):  
Masoumeh Orojloo ◽  
Saeid Amani
Keyword(s):  
Nmr Spectroscopy ◽  
Low Cost ◽  
Anion Recognition ◽  
Visible Spectroscopy ◽  
Elemental Analyses ◽  
Base Derivative ◽  
Anions And Cations ◽  
Uv Visible ◽  
Job's Method ◽  
Naked Eye Detection

A new chromogenic receptor, 4-((2,4-dichlorophenyl)diazenyl)-2-(3-hydroxypropylimino)methyl)phenol, has been designed and synthesized for quantitative and low-cost detection of various biological anions and cations. The dye was characterized by elemental analyses, infrared, UV-visible spectroscopy, and NMR spectroscopy. The chemosensor showed visual changes towards anions, such as F– and H2PO4–, in DMSO and towards cations, such as Al3+, Cu2+, Fe3+, and Cr3+, in DMSO/water (9 : 1). The anion recognition property of the receptor via proton transfer was monitored by UV-visible titration and 1H NMR spectroscopy. The binding constant (Ka) and stoichiometry of the host–guest complexes formed were determined by the Benesi–Hildebrand (B–H) plot and Job's method, respectively.

Synthesis of perialkynylated tetrapyrazinoporphyrazines and its Optical Properties

2009 ◽  
Vol 2009 (5) ◽  
pp. 312-316 ◽  
Author(s):  
Chun Keun Jang ◽  
Jae Yun Jaung
Keyword(s):  
Optical Properties ◽  
Nmr Spectroscopy ◽  
Laser Desorption ◽  
Diels Alder ◽  
Visible Spectroscopy ◽  
H Nmr ◽  
Uv Visible ◽  
Tof Ms ◽  
Matrix Assisted Laser ◽  
Matrix Assisted Laser Desorption

Some phthalocyanines soluble in organic solvents have been developed by peripheral introduction of substituent groups. We report a new method for preparation of the polyphenyl-substituted dicyanopyrazines based on the [2 + 4] Diels-Alder cycloaddition of the tetraphenylcyclopentadienone to an ethynyl compound. The synthesised tetrapyrazinoporphyrazinato metal complexes were characterised by UV-visible spectroscopy, MALDI-TOF-Ms (matrix-assisted laser desorption ionisation time-of-flight mass) spectroscopy, and 1H NMR spectroscopy.

scholarly journals Synthesis, characterization, electrochemical studies and X-ray structures of mixed-ligand polypyridyl copper(II) complexes with the acetate

2016 ◽  
Vol 81 (11) ◽  
pp. 1251-1262 ◽  
Author(s):  
Oluwafunmilayo Adekunle ◽  
Ray Butcher ◽  
Oladapo Bakare ◽  
Olusegun Odunola
Keyword(s):  
Room Temperature ◽  
Magnetic Measurements ◽  
Magnetic Moments ◽  
Copper Ion ◽  
X Ray Diffraction ◽  
Visible Spectroscopy ◽  
X Ray ◽  
Elemental Analyses ◽  
Structural Details ◽  
Uv Visible

[Cu(phen)2(CH3COO)](ClO4).2H2O (1) and [Cu(bipy)2(CH3COO)]-(ClO4).H2O (2) {phen = 1,10-phenanthroline, bipy = 2,2?-bipyridine}were synthesized and characterized. The complexes were characterized by employying elemental analyses, infrared and UV-Visible spectroscopy, room temperature magnetic measurements and the crystal structures elucidated using X-ray diffraction experiment. The redox properties of the complexes were also investigated. Both structures have a square pyramidal CuN4O chromophore which exhibit significant distortions due to long Cu-O [2.217(3) ? for (1) and 2.179 (1) for (2)] and Cu-N [2.631(2) ? for (1) and 2.714(1) ? for (2)] bonds. This distortion if further shown by the O-Cu-N bond angles [147.71(8) o for (1) and 153.40(5) o for (2)]. The elemental analyses further support the structural details unveiled by the single crystal X-ray diffraction analysis. The infrared spectra shows the acetate vibrational frequencies at 1587 cm-1,1428 cm-1, 1314 cm-1 for (1) and 1571 cm-1, 1441 cm-1, 1319c m-1 for (2) and the perchlo-rate bands at 1059 cm-1, 720 cm-1 (1) and 1080 cm-1,768 cm-1 (2). The broad d-d bands for the copper ion at 14,514 cm-1(1) and 14,535 cm-1(2) support the adoption of square pyramid geometries. The magnetic moments for the two complexes are 1.83 B.M for (1) and 1.72 B.M for (2). The peak to peak values of the two complexes show that the electrode reactions are quasi-reversibile with ?Ep = 0.023V (1) and 0.025V for (2). In both structures, there are ?-? intermolecular interactions in addition to hydrogen bonding between the units.

Application of Acacia modesta and Dalbergia sissoo gums as green matrix for silver nanoparticle binding

2016 ◽  
Vol 5 (1) ◽  
Author(s):  
Hira Munir ◽  
Muhammad Shahid ◽  
Fozia Anjum ◽  
Muhammad Nadeem Akhtar ◽  
Sayed M. Badawy ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Antibacterial Activity ◽  
Low Cost ◽  
Dalbergia Sissoo ◽  
Visible Spectroscopy ◽  
Green Matrix ◽  
Gram Negative ◽  
Gram Positive Bacteria ◽  
Uv Visible ◽  
Cost Efficient

AbstractA low-cost, efficient, and ecofriendly method for the synthesis of silver nanoparticles (AgNPs) using gums as reducing agent was performed. The obtained nanoparticles were characterized by UV-visible spectroscopy. The antibacterial activity of the prepared nanoparticles was tested against Gram-negative and Gram-positive bacteria. The

scholarly journals Synthesis of Silver Nanoparticles by Phyllanthus emblica Plant Extract and Their Antibacterial Activity

2020 ◽  
Vol 17 (2) ◽  
pp. 136-145
Author(s):  
Rajesh Kumar Meena ◽  
Risikesh Meena ◽  
Dinesh Kumar Arya ◽  
Sapana Jadoun ◽  
Renu Hada ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Antibacterial Activity ◽  
Plant Extract ◽  
Low Cost ◽  
Green Technology ◽  
Phyllanthus Emblica ◽  
Visible Spectroscopy ◽  
Synthesis Of Nanoparticles ◽  
Resonance Band ◽  
Uv Visible

The silver nanoparticle was successfully synthesized by using the help of Phyllanthus emblica plant extract as a reducing agent and aqueous silver nitrate as the precursor. Moreover, physical and chemical methods are widely used for the synthesis of nanoparticles, but these methods have expensive and not ecofriendly. This study highlights the green, rapid, facile, cost-effective, and ecofriendly synthesis and synthesized nanoparticles also investigate their antibacterial activity. Synthesized silver nanoparticles are analyzed by different techniques of modes like XRD, UV-Visible spectroscopy, TEM, FTIR, and photoluminescence (PL). The prepared AgNPs show characteristic absorption peak in UV-Visible spectroscopy due to SPR (surface plasmonic resonance) band between 400 to 450 nm wavelength, which was confirmed by TEM (transmission electron microscopy) image. X-ray diffraction (XRD) results showed the crystalline nature of AgNPs as well as the size of nanoparticles calculated with the help of TEM (20-25 nm) and XRD (25 nm). ATR spectroscopy identified the functional groups that are involved in the reduction of silver ion to AgNPs and the PL spectrum indicates higher emission in the green region and low emission peak in the UV region. Antibacterial activity of AgNPs analyzed against with the help of E.Coli bacteria and the result shows that a higher concentration of AgNPs is increasing as well as a zone of inhibition increased. This method is environmentally friendly, of low cost, and less expensive method for the fabrication of AgNPs in abundance which can be further helpful for biosensor devices as well as for other applications such as pollutant degradation, pharmaceutical, and hydrogen production, etc therefore can promote the application of green technology for the production of AgNPs.

scholarly journals Photochromism of indolino-benzopyrans studied by NMR and UV-visible spectroscopy

2006 ◽  
Vol 2006 ◽  
pp. 1-7 ◽  
Author(s):  
S. Delbaere ◽  
J. Berthet ◽  
M. A. Salvador ◽  
G. Vermeersch ◽  
M. M. Oliveira
Keyword(s):  
Nmr Spectroscopy ◽  
Rate Constant ◽  
Colored Form ◽  
Visible Spectroscopy ◽  
Uv Visible

The synthesis of photochromic 3,3-di(4′-fluorophenyl)-3H-benzopyrans fused to an indole moiety is described. The structures of photomerocyanines elucidated by NMR spectroscopy and spectrokinetic data (λmax⁡of colored form, colorability, and rate constant of bleaching) obtained by UV-visible spectroscopy are reported.

Synthesis and optical properties of tetrapyrazino-porphyrazines containing camphorquinone group

2009 ◽  
Vol 13 (07) ◽  
pp. 794-797 ◽  
Author(s):  
Chun Keun Jang ◽  
Seung Hwan Byun ◽  
Song Hak Kim ◽  
Do Kyung Lee ◽  
Jae Yun Jaung
Keyword(s):  
Optical Properties ◽  
Nmr Spectroscopy ◽  
Fluorescence Spectroscopy ◽  
Elemental Analysis ◽  
Infrared Radiation ◽  
Condensation Reaction ◽  
Visible Spectroscopy ◽  
H Nmr ◽  
Uv Visible ◽  
Tof Ms

2,3-dicyanopyrazine and metallophthalocyanines were synthesized with magnesium containing (±)camphorquinone substituent. 2,3-dicyanopyrazine was prepared by condensation reaction of diaminomaleonitrile (DAMN) with 1,7,7-trimethylbicyclo[2.2.1]heptane-2,3-dione (1). The tetrapyrazinoporphyrazine was characterized by a combination of UV-visible spectroscopy, fluorescence spectroscopy, infrared radiation, elemental analysis, MALDI-TOF-MS and 1H NMR spectroscopy.

scholarly journals Dual Detection Highly Selective Colorimetric Chemosensors for Fluoride and Copper(II) Ions Based on Imine-Phenol Derivative

2020 ◽  
Vol 32 (4) ◽  
pp. 803-809
Author(s):  
Phoomirut Nusuwan ◽  
Piyada Jittangprasert ◽  
Mayuso Kuno ◽  
Kem Pumsa-ard ◽  
Pan Tongraung
Keyword(s):  
High Selectivity ◽  
Water Solution ◽  
High Yield ◽  
Visible Spectroscopy ◽  
Phenol Derivative ◽  
Qualitative Detection ◽  
Test Kit ◽  
Dual Detection ◽  
Uv Visible ◽  
Naked Eye Detection

A simple dual detection using colorimetric chemosensor, imine-phenol derivative L (bearing a 2-iminephenol group as a binding unit and a-nitrophenylazo group as a signaling unit), were synthesized for a high yield in two simple steps. Complexations of chemosensor L with various anions in acetonitrile solvent and other metal ions in DMSO/H2O solvent were monitored by UV-visible spectroscopy. The results indicated that the chemosensor L showed high selectivity for F− and Cu2+ ions. Furthermore, the complexes for L-F− and L-Cu2+ were evaluated by computational chemistry using a B3LYP/6-31G (d,p) and a B3LYP/6-311G (d,p) level of calculation. The complexes between L with F− and Cu2+ were magenta and yellow colored, respectively. Chemosensor L can be applied for the analysis of F− and Cu2+ ions with naked-eye detection making colour comparisons between the standard and the real sample. Most importantly, semi-qualitative detection of Cu2+ in water solution were successfully carried out with the developed test kit using chemosensor L.

scholarly journals Formation of Carbon-Silicon Bond and Effect of Silicon on Organic Reactions

2020 ◽  
Vol 11 (1) ◽  
pp. 101-105
Author(s):  
Ashis K Sarker
Keyword(s):  
Nmr Spectroscopy ◽  
Ir Spectroscopy ◽  
Bond Formation ◽  
Research Work ◽  
Engineering Science ◽  
Proton Nmr Spectroscopy ◽  
Visible Spectroscopy ◽  
Ft Ir ◽  
Uv Visible ◽  
Ft Ir Spectroscopy

In this work, we report carbon-silicon bond formation in thiophene, assisted with alkylated silylchloride. The formylation reaction of silylated thiophene has been discussed and achieved 61% overall yield of reactions. The compounds obtained are characterized quantitatively and qualitatively by using elemental analysis, FT-IR spectroscopy, UV/Visible spectroscopy, and proton NMR spectroscopy. This research work will boost chemists to make the carbon-silicon bond and utilize them in various applications. Journal of Engineering Science 11(1), 2020, 101-105

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