Calculations of models of the σ-electron structure of molecules. I. Ethylene; A bicentric and a polycentric semiempirical approach

1966 ◽  
Vol 31 (8) ◽  
pp. 3091-3103 ◽  
Author(s):  
R. Polák
Keyword(s):  
Electron Structure ◽  
Structure Of Molecules ◽  
Semiempirical Approach

scholarly journals ELECTRON PARAMETERS OF 1,1,1,2 - TETRAFLUOROALKANES

2021 ◽  
pp. 106-112
Author(s):  
Алексей Викторович Котомкин ◽  
Наталья Петровна Русакова ◽  
Владимир Владимирович Туровцев ◽  
Юрий Димитриевич Орлов
Keyword(s):  
Quantum Theory ◽  
Functional Groups ◽  
Electron Structure ◽  
Intramolecular Interactions ◽  
Atoms In Molecules ◽  
Structure Of Molecules

Найдена равновесная структура молекул ряда тетрафторалканов вида CF-CFH-(CH) -CH, где 0 ≤ n ≤ 7; в рамках QTAIM вычислены электронные параметры групп, рассмотрены внутримолекулярные взаимодействия, построена шкала электроотрицательностей групп. Within the «quantum theory of atoms in molecules» (QTAIM) the electron structure of molecules of the tetrafluorinealkane series CF-CFH-(CH)-CH, where 1 ≤ n ≤ 7, was studied. Intramolecular interactions were considered. Series of electronegativity of the functional groups has been made.

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.

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