Image of a single molecule

The image of a single molecule, the structure of which has been determined by crystal structure analysis, shows a molecular structure, but not a crystal structure , an X-ray structure , or even worse an X-ray . The packing and the spatial arrangement of the molecules in a crystal are always an indispensable part of a crystal structure. 

The first AFM molecular images of a single molecule of 6 with a high molecular weight sample (Mw = 5 330000, Mn = 4110000) deposited onto... 

Figure 7.5 Tautomerization of a single phthalocyanine molecule on a two mono-layer NaCI film on Cu(111). (a) STM images of a single molecule before and after tautomerization (V = 0.7 V, /, = 2 pA). The black dot in the left image indicates the position of the...

Figure Bl.22.11. Near-field scanning optical microscopy fluorescence image of oxazine molecules dispersed on a PMMA film surface. Each protuberance in this three-dimensional plot corresponds to the detection of a single molecule, the different intensities of those features being due to different orientations of the molecules. Sub-diffraction resolution, in this case on the order of a fraction of a micron, can be achieved by the near-field scaiming arrangement. Spectroscopic characterization of each molecule is also possible. (Reprinted with pennission from [82]. Copyright 1996 American Chemical Society.)...

Structures 1 and 2 are enantiomers, and both are optically active. In structures 3 and 4, there is a plane of symmetry, i.e., there is a mirror image within a single molecule. Such a structure is called a meso structure. Structures 3 and 4 are superimposable, and essentially are the same compound. Hence, we have a meso-tartaric acid and it is achiral (since it has a plane of symmetry, and it is superimposable on its mirror image). Meso-tartaric acid is optically inactive. Therefore, for tartaric acid, we have (-f), (—) and meio-tartaric acid. 

AFM Imaging of a Single Rod-like Helical Polymer Molecule on a Surface. 134... 

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