Specific cation effect on quenching reactions of excited tris(α,α′-diimine)ruthenium(II) and tris(2,2′-bipyridine)chromium(III) by tris(oxalato)- and tris(malnato)chromates(III) in aqueous solutions

2004 ◽  
Vol 357 (5) ◽  
pp. 1565-1570 ◽  
Author(s):  
Munetaka Iwamura ◽  
Takuhiro Otsuka ◽  
Youkoh Kaizu
Keyword(s):  
Aqueous Solutions ◽  
Cation Effect

Infrared spectrum of HDO in aqueous solutions of perchlorates and tetrafluoroborates

1970 ◽  
Vol 48 (19) ◽  
pp. 3019-3025 ◽  
Author(s):  
George Brink ◽  
Michael Falk
Keyword(s):  
Aqueous Solutions ◽  
Pure Water ◽  
Ion Pairs ◽  
Low Frequency ◽  
Frequency Component ◽  
High Frequency Component ◽  
Water Molecules ◽  
Oh Groups ◽  
Cation Effect ◽  
Crystalline Hydrates

The OH and OD stretching bands of HDO in aqueous solutions containing the ions ClO4− and BF4− are split into two components. The high-frequency component, A, does not shift with temperature. It is interpreted as due to OH groups involved in weak [Formula: see text] or [Formula: see text] hydrogen bonds. This interpretation is in line with the corresponding OH frequencies of other systems containing ClO4− ions, such as methanolic solutions and crystalline hydrates. Solvent-separated ion pairs may account for the observed cation effect on band A. The low-frequency component, B, varies with temperature almost exactly like the corresponding band of pure water. It is interpreted to be due to those OH groups which are not associated with the anion. Components A and B are not resolved in solutions of most electrolytes because the distribution of strengths of interactions of OH groups with most anions overlaps that of [Formula: see text] interactions between water molecules.

scholarly journals Negligible cation effect on the vibrational relaxation dynamics of water molecules in NaClO4 and LiClO4 aqueous electrolyte solutions

RSC Advances ◽  
2017 ◽  
Vol 7 (82) ◽  
pp. 52111-52117 ◽  
Author(s):  
Qianshun Wei ◽  
Dexia Zhou ◽  
Hongtao Bian
Keyword(s):  
Aqueous Solutions ◽  
Vibrational Relaxation ◽  
Aqueous Electrolyte ◽  
Electrolyte Solutions ◽  
Water Molecules ◽  
Relaxation Dynamics ◽  
Cation Effects ◽  
Aqueous Electrolyte Solutions ◽  
Cation Effect

Negligible cation effects on the vibrational relaxation dynamics of water molecules in NaClO4 and LiClO4 aqueous solutions.

scholarly journals Raman study of cation effect on sulfate vibration modes in solid state and in aqueous solutions

2013 ◽  
Vol 44 (11) ◽  
pp. 1603-1608 ◽  
Author(s):  
Kawther Ben Mabrouk ◽  
Thomas H. Kauffmann ◽  
Hassen Aroui ◽  
Marc D. Fontana
Keyword(s):  
Solid State ◽  
Aqueous Solutions ◽  
Vibration Modes ◽  
Cation Effect ◽  
Raman Study

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.

Sign in / Sign up

Export Citation Format

Share Document