Pseudo-Buckyballs as Potential Superconductors.
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.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 24, 1997
- Accession Number
- ADA322733
Entities
People
- David Tománek
- James E. Jackson
- James L. Dye
Organizations
- Michigan State University