Accession Number : ADA322733
Title : Pseudo-Buckyballs as Potential Superconductors.
Descriptive Note : Final rept. 1 Oct 92-30 Sep 96,
Corporate Author : MICHIGAN STATE UNIV EAST LANSING
Personal Author(s) : Dye, James L. ; Jackson, James E. ; Tomanek, David
PDF Url : ADA322733
Report Date : 24 JAN 1997
Pagination or Media Count : 17
Abstract : Alkali metal adducts to LOGEAs (Large Organic Globular Electron Acceptors) share with superconducting 'Buckyball' adducts such as K3C60 the globular shape, delocalized pi systems and accessible reduction potentials that are believed important for superconductivity. This research focused on the synthesis and study of reduced macrobicyclic Schiff-base cryptands that have an aromatic linking group in each of the three strands. Some samples, when reduced with Rb or K, showed LFMA (Low Frequency Microwave Absorption) up to 50 K and/or a pronounced diamagnetic downturn in the susceptibility below 30 K. These phenomena are usually associated with superconductivity. The magnitude of these effects was, however, only that expected for traces (<1%) of superconducting phases and the effects were only present in a few samples. Much effort over a two-year time span was directed toward the identification and isolation of the phase(s) responsible, but without success. Although superconductivity could not be verified, these studies opened a new area of research; the study of the solid state behavior of radical anion salts. Except for some crystal structure determinations, this field is virtually unexplored and is likely to lead to potentially useful electronic and magnetic materials. The stability at and above room temperature, even of multiply reduced compounds, is especially encouraging.
Descriptors : *FULLERENES, *SUPERCONDUCTIVITY, SYNTHESIS(CHEMISTRY), AROMATIC COMPOUNDS, ANIONS, MICROWAVE FREQUENCY, MAGNETIC MATERIALS, ALKALI METALS.
Subject Categories : Electricity and Magnetism
Distribution Statement : APPROVED FOR PUBLIC RELEASE