نتایج جستجو برای: اسپکتروفوتومتر uv vis

تعداد نتایج: 79554  

Journal: :iranian chemical communication 2015
nasrin sohrabi maryam dookheh

in this study at first , an azo dye, 2,7- naphthalenediol, 2-[(4-bromophenyl)azo (bpand) as a ligand has been synthesized by addition of p-bromoaniline to the modified montomorillonite k10 clay. this ligand was characterized using 1h-nmr, uv-vis and ir spectroscopies. subsequently, its interaction with calf thymus deoxyribonucleicacid ,ct-dna was investigated in 5 mm phosphate buffer solution, ...

2013
Agnieszka Pazik Anna Skwierawska

Syntheses of N,N'-phenyltetrazole podands link with aliphatic chains containing oxygen, nitrogen and sulphur atoms, are described. The complexing properties of these compounds towards metal cations (Fe2+, Cu2+, Zn2+, Co2+, Ni2+) were investigated by absorption and infrared spectroscopy. The UV-Vis titrations were performed to estimate the stability constant values of the respective complexes wi...

Journal: :Dalton transactions 2011
Chi-On Ng Sze-Wing Lai Hua Feng Shek-Man Yiu Chi-Chiu Ko

A series of rhenium complexes with acetylamino- and trifluoroacetylamino-containing 1,10-phenanthroline ligands have been synthesized, characterized and their photophysical and electrochemical properties studied. These complexes were found to show significant UV-vis and emission changes on addition of CN(-), F(-) and AcO(-) anions. Their reactivity towards CN(-), F(-) and AcO(-) anions, was als...

2010
Pasquale Sellitto

Observations of ozone from satellite platform is a key source of information to monitor and understand processes that may have a relevant impact on public health, air quality and climate. To achieve at the same time a reasonable spatial resolutions and a sufficient sensitivity, nadir UV/VIS sensor may be exploited. The topic of the PhD thesis work summarized here is the use of neural networks (...

Journal: :international journal of nano dimension 0
p. rejani nano science research lab, department of chemistry, d.b.college,sasthamcotta, kollam,kerala, india. a. radhakrishnan nano science research lab, department of chemistry, d.b.college,sasthamcotta, kollam,kerala, india. b. beena nano science research lab, department of chemistry, d.b.college,sasthamcotta, kollam,kerala, india.

zno nanorod was prepared by microwave assisted method. the crystal structure of the nano powders were confirmed by x-ray diffraction analysis and the mean particle size was estimated by the scherrer,s formula .the surface morphology of the nano particles were analyzed by   using sem . the absorption spectrum of the material in the uv-vis range was recorded .the energy band gap of the material w...

Journal: :Organic & biomolecular chemistry 2014
Steven J Edeson Julong Jiang Stephen Swanson Panayiotis A Procopiou Harry Adams Anthony J H M Meijer Joseph P A Harrity

The designation of E/Z-geometrical isomers in 3-acylidene 2-oxindoles by NMR spectroscopy can lead to erroneous assignment of alkene stereochemistry because of the narrow chemical shift range observed over a large series of analogues. In contrast, UV-Vis spectroscopy offers a convenient and more reliable method for alkene stereochemical assignment. A combination of X-ray crystallography and the...

2015
P. T. V. Lakshmi Devi Priyanka A. Annamalai

Biosynthesis of silver nanoparticles using Westiellopsis sp. (A15), a filamentous cyanobacterium belonging to the family Fischerellaceae, has been demonstrated. Aqueous silver ions (Ag(+)) when exposed to the culture filtrate of Westiellopsis were reduced in the solution, which were characterized by biophysical measures utilizing the UV-Vis spectroscopy, scanning electron microscopy (SEM), and ...

2004
G. A. Gaddy Jason L. McLain Matthew S. Bratcher

The photoinduced formation of silver (Ag) clusters and particles in poly(vinyl alcohol) poly(acrylic acid) blend films is described. The photoreduction of the Ag is achieved by subjecting the Ag doped films to 350 nm photons. The formation of Ag clusters and particles is monitored using UV-VIS spectroscopy. Films treated with H2O2 exhibit bleaching of the UV-VIS signals corresponding to Ag clus...

Journal: :Molecules 2014
Eveline M Bezerra João R Bezerra-Neto Francisco A M Sales Ricardo P dos Santos Alice M C Martins Pedro de Lima-Neto Ewerton W S Caetano Eudenilson L Albuquerque Valder N Freire

UV-vis optical absorption spectra of the antitrypanocidal drug benznidazole solvated in water were measured for various concentrations. The spectra show a prominent peak around 3.80 eV, while deconvolution of the UV-vis optical absorption spectra revealed six bands centered at 3.60, 3.83, 4.15, 4.99, 5.60, and 5.76 eV. Benznidazole electronic transitions were obtained after density functional t...

2015
Justine S. Wagner

......................................................................................................................................................................3 Acknowledgements...................................................................................................................................................4 Introduction to Photoinitiators....................................

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