Searching, Three Dimensional Polymers

In view of the marked kinetic effects described so far, it has seemed wise to carry out some examination of the three-dimensional disposition of the groups on the polyethylenimines. It has been our hope that even a rudimentary insight into the conformation of the polymer would provide a guide to the search for other types of chemical reaction that might be facilitated in the presence of these polymers. The results of investigations with two conformational probes, 19F nuclear magnetic resonance and excimer fluorescence, are described. 

Canonical Numbering and Constitutional Symmetry Chemical Abstracts Service Information System Graph Theory in Chemistry Inorganic Three-dimensional Structure Databases Polymers Structural Representation Standard Exchange Formats for Spectral Data Structure and Substructure Searching Structure Databases Structure Representation Three-dimensional Structure Generation Automation Three-dimensional Structure Searching. 

From today s perspective, there are perhaps three major milestones in the search for superconductivity in the organics and the search for high-temperature superconductivity based on these ideas that are worthy of special comment. The first was the discovery of superconductivity in the polymer (SN) by Greene et al. [30] in our laboratory in 1975. This was a remarkable discovery even though the superconductivity occurred only at temperatures well below 1 K. The compound (SN)X is not an organic, of course, as it has no carbon in it nor is the superconductivity believed to be of a nonphonon variety and the band structure is not even truly one-dimensional. Nevertheless, the occurrence of superconductivity in such a polymer provided a tremendous boost to the field and provided positive proof that superconductivity could occur in systems of limited dimensionality. 

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