Molecular clusters in aqueous solutions of pyridine and its methyl derivatives

2011 ◽  
Vol 13 (13) ◽  
pp. 6260 ◽  
Author(s):  
Wojciech Marczak ◽  
Bożena Czech ◽  
László Almásy ◽  
Didier Lairez
Keyword(s):  
Aqueous Solutions ◽  
Molecular Clusters ◽  
Methyl Derivatives

N.M.R. spectra of 'p-nitrosophenol' and its methyl derivatives

1966 ◽  
Vol 19 (5) ◽  
pp. 841 ◽  
Author(s):  
RK Norris ◽  
S Sternhell
Keyword(s):  
Aqueous Solutions ◽  
Long Range ◽  
Organic Solvents ◽  
Negative Charge ◽  
Spin Coupling ◽  
Potassium Salts ◽  
Methyl Derivatives ◽  
Spin Spin Coupling

On the basis of N.M.R. spectra, supported by u.v. and i.r. data, it can be concluded that "p-nitrosophenol" and several of its methyl derivatives exist predominantly in the benzoquinone monoxime form in organic solvents and that in aqueous solutions the corresponding potassium salts have the negative charge largely on the oxime oxygen. The protons on the α-carbon syn to the quinone monoxime hydroxyl are deshielded with respect to the anti protons but this relationship appears to be reversed in the anions. The N.M.R. spectra of some p-nitrosoanisoles and quinone monoxime methyl ethers are given and syn-anti equilibria and long-range spin-spin coupling are discussed.

The structural elucidation of aqueous H3BO3 solutions by DFT and neutron scattering studies

2020 ◽  
Vol 22 (30) ◽  
pp. 17160-17170
Author(s):  
Yongquan Zhou ◽  
Toshio Yamaguchi ◽  
Wenqian Zhang ◽  
Kazutaka Ikeda ◽  
Koji Yoshida ◽  
...  
Keyword(s):  
Aqueous Solutions ◽  
Neutron Scattering ◽  
Molecular Clusters ◽  
Structural Elucidation ◽  
Temperature Sensitive

The structure of aqueous H3BO3 solutions was studied via neutron scattering and EPSR modelling. B(OH)3 forms three kinds of molecular clusters in aqueous solutions. Their relative contents are both concentration- and temperature-sensitive.

Rheological properties of guar and its methyl, hydroxypropyl and hydroxypropyl-methyl derivatives in semidilute and concentrated aqueous solutions

Polymer ◽  
2010 ◽  
Vol 51 (9) ◽  
pp. 1972-1982 ◽  
Author(s):  
Daniela Risica ◽  
Andrea Barbetta ◽  
Luca Vischetti ◽  
Cesare Cametti ◽  
Mariella Dentini
Keyword(s):  
Aqueous Solutions ◽  
Rheological Properties ◽  
Concentrated Aqueous Solutions ◽  
Methyl Derivatives

scholarly journals Влияние УФ облучения на формирование молекулярных кластеров серебра и их стабилизация в растворах, композиционных и оксидных покрытиях

2020 ◽  
Vol 128 (6) ◽  
pp. 701
Author(s):  
E.K. Евстропьев ◽  
H.B. Никоноров ◽  
A.C. Саратовский ◽  
Д.П. Данилович
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Aqueous Solutions ◽  
Uv Irradiation ◽  
Molecular Clusters ◽  
Luminescence Spectroscopy ◽  
Nanoparticle Formation ◽  
Scanning Electron

The influence of UV irradiation on the formation of Ag molecular clusters in aqueous solutions containing metals (Zn,Mg,Ag) nitrates and polyvinylpyrrolidone has been studied. Optical and luminescence spectroscopy, scanning electron microscopy were used in this study. It was found that UV irradiation significantly accelerates Ag ions reduction and Ag molecular clusters and nanoparticle formation.

Ultrathin frozen sections of yeast without aldehyde prefixation

1978 ◽  
Vol 36 (2) ◽  
pp. 58-59
Author(s):  
K. J. Böhm ◽  
a. E. Unger
Keyword(s):  
Aqueous Solutions ◽  
Biological Material ◽  
Yeast Cells ◽  
Frozen Sections ◽  
Good Preservation ◽  
Ultrathin Frozen Sections

During the last years it was shown that also by means of cryo-ultra-microtomy a good preservation of substructural details of biological material was possible. However the specimen generally was prefixed in these cases with aldehydes.Preparing ultrathin frozen sections of chemically non-prefixed material commonly was linked up to considerable technical and manual expense and the results were not always satisfying. Furthermore, it seems to be impossible to carry out cytochemical investigations by means of treating sections of unfixed biological material with aqueous solutions.We therefore tried to overcome these difficulties by preparing yeast cells (S. cerevisiae) in the following manner:

Imaging polymers, proteins and dna in aqueous solutions with the atomic force microscope

1989 ◽  
Vol 47 ◽  
pp. 32-33
Author(s):  
S.A.C. Gould ◽  
B. Drake ◽  
C.B. Prater ◽  
A.L. Weisenhorn ◽  
S.M. Lindsay ◽  
...  
Keyword(s):  
Amino Acids ◽  
Dna Sequencing ◽  
Aqueous Solutions ◽  
Atomic Force Microscope ◽  
Piezoelectric Crystal ◽  
Atomic Force ◽  
Structure Of Molecules ◽  
Optical Lever

The atomic force microscope (AFM) is an instrument that can be used to image many samples of interest in biology and medicine. Images of polymerized amino acids, polyalanine and polyphenylalanine demonstrate the potential of the AFM for revealing the structure of molecules. Images of the protein fibrinogen which agree with TEM images demonstrate that the AFM can provide topographical data on larger molecules. Finally, images of DNA suggest the AFM may soon provide an easier and faster technique for DNA sequencing.The AFM consists of a microfabricated SiO2 triangular shaped cantilever with a diamond tip affixed at the elbow to act as a probe. The sample is mounted on a electronically driven piezoelectric crystal. It is then placed in contact with the tip and scanned. The topography of the surface causes minute deflections in the 100 μm long cantilever which are detected using an optical lever.

Physical Properties of TCNQ Salts with N-Methyl Derivatives of Pyridine

1982 ◽  
Vol 85 (1) ◽  
pp. 257-263 ◽  
Author(s):  
A. Graja ◽  
M. Przybylski ◽  
B. Butka ◽  
R. Swietlik
Keyword(s):  
Physical Properties ◽  
Methyl Derivatives ◽  
Derivatives Of
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