Accession Number : ADA296461

Title :   Interative Divergent/Convergent Doubling Approach to Linear Conjugated Oligomers. A Rapid Route to a 128 A Long Potential Molecular Wire and Molecular Alligator Clips.

Descriptive Note : Technical rept.,

Corporate Author : SOUTH CAROLINA UNIV COLUMBIA DEPT OF CHEMISTRY AND BIOCHEMISTRY

Personal Author(s) : Schumm, J. S. ; Jones, L., II ; Pearson, D. L. ; Hara, R. ; Tour, J. M.

PDF Url : ADA296461

Report Date : 07 JUN 1995

Pagination or Media Count : 8

Abstract : The ultimate computational system would consist of logic devices that are ultra dense, ultra fast, and molecular-sized. Even though state-of-the-art nanopatterning techniques allow lithographic probe assemblies to be engineered down to the 100 A gap regime, the issue of electronic conduction based upon single or small packets of molecules has not been addressed and the feasibility of molecular electronics remains theoretically controversial. In an attempt to assess the possibility of molecular wire conduction by spanning the 100 A probe gaps with small packets of molecules, we describe here the synthesis of phenylene-alkynylene oligomers that remain in a near-linear conformation due to 1,4-phenylene- substitution patterns and alkyne linearity. This linear arrangement should minimize undesired conformational movement during adhesion and testing between nanofabricated probes. Our approach to such a molecular framework involves a rapid iterative method that doubles molecular length at each iteration to provide an air and light-stable linear conjugated oligomer that is 128 A long that could also serve as a useful model for understanding bulk polymeric material properties. Moreover, the product could easily permit independent functionalization of the ends to serve as "molecular alligator clips" that might be required for surface contacts to metal probes for molecular electronic studies. jg p. 3

Descriptors :   *OLIGOMERS, *MOLECULAR ELECTRONICS, ELECTRONICS, METALS, PROBES, COMPUTATIONS, PACKETS, CONDUCTIVITY, MOLECULES, POLYMERS, WIRE, ADHESION, BULK MATERIALS, SURFACES, LITHOGRAPHY, ELECTRONS, FEASIBILITY STUDIES, LENGTH, LINEARITY, PATTERNS, LOGIC DEVICES, SUBSTITUTES, ITERATIONS, ALKYNES.

Subject Categories : Polymer Chemistry
      Organic Chemistry
      Physical Chemistry
      Electrical and Electronic Equipment
      Atomic and Molecular Physics and Spectroscopy

Distribution Statement : APPROVED FOR PUBLIC RELEASE