Methanobactin-Mediated One-Step Synthesis of Palladium Nanoparticles

NANO ◽  
2016 ◽  
Vol 11 (06) ◽  
pp. 1650064 ◽  
Author(s):  
Jia-Ying Xin ◽  
Hong-Chen Fan ◽  
Sheng-Fu Ji ◽  
Yan Wang ◽  
Chun-Gu Xia
Keyword(s):  
Photoelectron Spectroscopy ◽  
Palladium Nanoparticles ◽  
Fluorescence Spectra ◽  
Copper Binding ◽  
Secondary Nucleation ◽  
Visible Spectra ◽  
One Step ◽  
Ft Ir ◽  
Uv Visible ◽  
The One

The development of palladium nanoparticles (PdNPs) with a narrow size distribution is an important aspect of nanotechnology. Methanobactin (Mb) is a copper-binding small peptide that appears to function as an agent for copper sequestration and uptake in methanotrophs. Here, Mb was shown to bind and catalytically reduce Pd (II) to Pd (0). The one-step synthesis of monodisperse PdNPs using Mb as both coordination agent and reduction agent is reported. Fluorescence spectra, UV-visible spectra, X-ray photoelectron spectroscopy (XPS) and Fourier transform-infrared spectroscopy (FT-IR) suggested that the Mb molecules catalytically reduce Pd (II) to Pd (0) with the concomitant production of PdNPs. The Mb is then adsorbed onto the surface of the PdNPs to form an Mb–PdNPs coordination compound. This avoids secondary nucleation. The PdNPs are small with high monodispersity and are easily synthesized in Mb solution. The PdNPs were extremely stable and resisted aggregation even after several months.

scholarly journals Synthesis and Bioassay of Novel Quinozolins

2019 ◽  
Vol 17 (72) ◽  
pp. 129-138
Author(s):  
Yasmine Kadom. Al-Majedy
Keyword(s):  
Twist Angle ◽  
Antimicrobial Properties ◽  
Heat Of Formation ◽  
Gram Negative Bacteria ◽  
The Novel ◽  
Gram Positive Bacteria ◽  
Visible Spectra ◽  
Ft Ir ◽  
Uv Visible

Novel Quinozolins were synthesized in a good yield through convert lacton to lactam and study the biological activity of the synthesized compounds. Quinozolins were characterized by elemental analysis, FT-IR and UV/visible spectra. The novel Quinozolins have been tested in vitro against (gram positive bacteria Staphylococcus aureus and against other gram negative bacteria, such as Escherichia coli, Klebsiella pneumoniae, Pseudomonas aeruginosa, and Proteus vulgaris; in order to assess their antimicrobial properties. Moreover, charge, bond length, bond angle, twist angle, heat of formation and steric energy were calculated by using of the ChemOffice program. The study indicates that these Quinozolins have high activity against tested bacteria. Based on the reported results, it may be concluded that the coumarin act as synthons for synthesis of new Quinozolins derivatives through the replacement of oxygen atom by nitrogen atom.

scholarly journals Preparation and Spectral Study of New Complexes of Some Metal Ions with 3,5-Dimethyl-1H-Pyrazol-1-yl Phenyl Methanone

2011 ◽  
Vol 8 (4) ◽  
pp. 1005-1011
Author(s):  
Baghdad Science Journal
Keyword(s):  
Magnetic Susceptibility ◽  
Elemental Analysis ◽  
Room Temperature ◽  
Molar Conductivity ◽  
The Other ◽  
Octahedral Structure ◽  
Tetrahedral Structure ◽  
Visible Spectra ◽  
Ft Ir ◽  
Uv Visible

Many complexes of 3,5-dimethyl-1H-pyrazol-1-yl phenyl methanone with Cr(III), Co(II), Ni(II), Cu(II) and Cd(II) were synthesized and characterized by FT-IR, UV/visible spectra, elemental analysis, room temperature magnetic susceptibility and molar conductivity. Cd(II) complex was expected to have tetrahedral structure while all the other complexes were expected to have an octahedral structure.

scholarly journals Spectroscopic studies on the potassium 1-fluorobenzoyltrifluoroborate salt by using the FT-IR, Raman and UV–Visible spectra and DFT calculations

2020 ◽  
Vol 1204 ◽  
pp. 127534 ◽  
Author(s):  
Maximiliano A. Iramain ◽  
Ana E. Ledesma ◽  
Elizabeth Imbarack ◽  
Patricio Leyton Bongiorno ◽  
Silvia Antonia Brandán
Keyword(s):  
Dft Calculations ◽  
Spectroscopic Studies ◽  
Visible Spectra ◽  
Ft Ir ◽  
Uv Visible

scholarly journals Design, Synthesis, Spectral and Theoretical Studies of Some Picrates

2019 ◽  
Vol 32 (1) ◽  
pp. 174-182
Author(s):  
S. Amala ◽  
G. Rajarajan ◽  
E. Dhineshkumar ◽  
M. Arockia doss ◽  
V. Thanikachalam
Keyword(s):  
Geometrical Parameters ◽  
Slight Effect ◽  
Design Synthesis ◽  
1H And 13C Nmr ◽  
Visible Spectra ◽  
Ft Ir ◽  
Uv Visible ◽  
Small Change ◽  
Experimental Values ◽  
Good Agreement

The structures of newly synthesized compounds (1-3) viz. 3-ethyl-5-methyl-2,6-bis(4- chlorophenyl)piperidin-1-ium picrate (1), 3-ethyl-5-methyl-2,6-bis(4-methylphenyl)piperidin-1-ium picrate (2) and 3-ethyl-5-methyl-2,6-bis(3,4-dimethoxyphenyl)piperidin-1-ium picrate (3) were confirmed by elemental analysis, FT-IR, 1H and 13C NMR. The UV-visible spectra, fluoresence, emission properties of synthesized 1-3 in different solvents were studied. Compounds 1-3 solvatochromic displays a slight effect of the emission and absorption spectrum, indicating a small change in the dipole moment upon excitation of compounds 1-3. All the compounds were investigated by DFT. The theoretical geometrical parameters are in good agreement with experimental values.

scholarly journals One-Step Synthesis of the Nitrogen and Sulfur Codoped Carbon Dots for Detection of Lead and Copper Ions in Aqueous Solution

2020 ◽  
Vol 2020 ◽  
pp. 1-8
Author(s):  
Hui Gao ◽  
Yuqian Pang ◽  
Lei Li ◽  
Chun Zhu ◽  
Chaoqun Ma ◽  
...  
Keyword(s):  
Photoelectron Spectroscopy ◽  
Carbon Dots ◽  
Copper Ions ◽  
Size Distributions ◽  
Colorimetric Sensing ◽  
Emission Activity ◽  
One Step ◽  
Ft Ir ◽  
The Fourier Transform ◽  
Metal Ions Detection

Herein, by using the green and cheap L-cysteine as the precursor, nitrogen and sulfur codoped carbon dots (NS-CDs) were synthesized via a facile one-step hydrothermal method. The obtained NS-CDs showed the relatively narrow size distributions (2.1~3.9 nm) with the lattice spacing of 0.29 nm, as well as the excitation-dependent photoluminescence (PL) emission activity with the quantum yield (QY) of 18%. More interestingly, the PL intensity of NS-CDs was quenched by the addition of copper or lead ions (Cu2+ or Pb2+), which was shown in the tradition detection method by PL spectra. The NS-CDs exhibited ultrasensitive colorimetric sensing capability for both Cu2+ and Pb2+ by the color variance using naked eyes without any further treating. Two different coupling ways for detecting Pb2+ and Cu2+ were induced by the analysis of the Fourier transform infrared spectroscopy (FT-IR) and X-ray photoelectron spectroscopy (XPS). And the as-prepared NS-CDs showed their potential application in the heavy metal ions detection for the wastewater determination.

Synthesis of Newer Mercury(II) Complexes of Meso-Tetraaryl-21,23-Dithiaporphyrins

2020 ◽  
Vol 12 (3) ◽  
pp. 416-421
Author(s):  
Soumee Bhattacharya ◽  
Uma Narang ◽  
Kumar Karitkey Yadav ◽  
Anshu Dandia ◽  
Shive M. S. Chauhan
Keyword(s):  
Fluorescence Spectra ◽  
Mercuric Acetate ◽  
H Nmr ◽  
Sensing Applications ◽  
Mercury Complex ◽  
Mercury Complexes ◽  
Visible Spectra ◽  
Uv Visible ◽  
Chloroform Methanol ◽  
C Nmr

Due to the larger size of hetero atom and poor binding with metals, N2X2 type of core modified porphyrins show lesser tendency to form metal complexes. Mercury(II) complexes of symmetrical and unsymmetrical meso-tetraaryl-21,23-dithiaporphyrins are synthesized and characterized by the reaction of corresponding meso-tetraaryl-21,23-dithiaporphyrins with mercuric acetate in chloroform/methanol. These mercury complexes are well characterized by their UV-Visible spectra, fluorescence spectra, 1H NMR, 13C NMR and elemental analysis. Soret bands of mercury complex of unsymmetrical 5,20-bis-(4′-methoxyphenyl)-10,15-bisphenyl-21,23-dithiaporphyrin appeared at 442 nm and 462 nm whereas Q band appeared at 516 nm, 560 nm, 620 nm and 714 nm. Appearance of four Q bands is characteristic for this mercury complex of N2X2 type of core modified porphyrins. Mercury complex of unsymmetrical 5,20-bis-(4′-methoxyphenyl)-10,15-bisphenyl-21,23dithiaporphyrin is an excellent fluorescent molecule and showed fluorescence spectrum at 722 nm. These core modified porphyrin complexes provides a good coordination examples of mercury complexes of 21,23-dithiaporphyrins that can be used in sensing applications.

Preparation of Polycaprolactone/Ethanolic Extract Propolis Nanofibers Films

2012 ◽  
Vol 506 ◽  
pp. 226-229 ◽  
Author(s):  
Krit Sutjarittangtham ◽  
S. Sanpa ◽  
Tawee Tunkasiri ◽  
Pornchai Rachtanapun ◽  
P. Chantawannakul ◽  
...  
Keyword(s):  
Functional Group ◽  
Ethanolic Extract ◽  
Mechanisms Of Action ◽  
Pharmacological Properties ◽  
Electrospinning Technique ◽  
One Step ◽  
Ft Ir ◽  
Antitumor Properties ◽  
The One ◽  
Scanning Electron

Recent years, propolis has plenty of biological and pharmacological properties and its mechanisms of action have been widely investigated. There is a substantive database on the biological activity and toxicity of propolis indicating it may have many antibiotic, antifungal, antiviral and antitumor properties, among other attributes. The one-step incorporation of propolis into nanofibrous mats of polycaprolactone (PCL) by electrospinning was demonstrated. In this research, the preparation of the PCL nanofibers films added ethanolic extract propolis (EEP) by electrospinning technique was studied. The EEP content was varied from 0, 2, 4, 6, 8 and 10%. The morphology was observed by a scanning electron microscope (SEM). The functional group was investigated by FT-IR

Cellulose Nanofiber as Potential Absorbent Material for Chloride Ion

2021 ◽  
Vol 317 ◽  
pp. 263-269
Author(s):  
Muhammad Syukri Mohamad Misenan ◽  
Nurjahirah Janudin ◽  
Mas Amira Idayu ◽  
Mohd Nor Faiz Norrrahim ◽  
Siti Hasnawati Jamal ◽  
...  
Keyword(s):  
Low Cost ◽  
Cellulose Nanofibers ◽  
Chloride Ion ◽  
Absorption Capacity ◽  
Visible Spectra ◽  
Ft Ir ◽  
Uv Visible ◽  
Hcl Concentration ◽  
Hcl Solution

A simple, low cost and rapid analytical method for determination of HCl concentration after being treated with cellulose and cellulose nanofibers (CNF) is developed. This method is based on color intensity after the HCl solution is doped with sodium iodide (NaI). The color of HCl solution changes from colorless to yellow. The intensity of the color is measured by UV – Visible spectroscopy. The UV-Visible spectra of 0.15 M HCl treated with cellulose and cellulose nanofibers is reduced from its initial concentration. The CNF absorption capacity is higher as compared to cellulose. FT-IR analysis showed that there is interaction between C-H group from the CNF backboned and chloride ion from HCl solution.

scholarly journals Synthesis and Characterization of Cobalt(II) Complexes with Hemilabile P^N Donor Ligands

2019 ◽  
Vol 31 (3) ◽  
pp. 566-568
Author(s):  
Rajjyoti Gogoi ◽  
Chandan Pathak ◽  
Geetika Borah
Keyword(s):  
Spectroscopic Technique ◽  
Donor Ligands ◽  
Spectra Analysis ◽  
Electronic Spin ◽  
Distorted Octahedral ◽  
Spin Resonance ◽  
Visible Spectra ◽  
Ft Ir ◽  
Uv Visible ◽  
Pyridylphosphine Ligands

Two cobalt(II) complexes viz. CoCl2{PPh2(p-C6H4NMe2)}2 (C1) and CoCl2(PPh2Py)2 (C2) were synthesized by reacting CoCl2·6H2O and 4-(dimethylamino)phenyldiphenylphosphine and diphenyl-2-pyridylphosphine ligands, respectively. The complexes were characterized by elemental analysis, FT-IR, UV-visible and electronic spin resonance (ESR) spectroscopic technique. Both the complexes were found stable at room temperature. EPR measurements and UV-visible spectra analysis of C1 and C2 are consistent with a tetrahedral Co(II) and tetragonally distorted octahedral Co(II) ions, respectively.

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