SYNTHESIS, UV-SPECTRA, AND SOME ELECTROCHEMICAL PROPERTIES OF NOVEL 3,3′-BRIDGed-2,2′-BITHIENYLS

Abstract

A convenient synthesis of a number of 3,3′-bridged-bis-2,2′-thienyls as potential building blocks for novel conducting polymers is reported. The UV-spectra and oxidation potentials of these novel compounds are given.

Although the UV-spectra correlated to the degree of coplanarity of these species, the oxidation potentials did not correlate, and no tendency to polymerize was observed for the N-bridged thienyls, 1a-1d, 2a-2c.This behavior is in contrast to results found for other 2,2′-bithienyls. These findings are explained by nitrogen and sulfur adsorption orientation of the N-bridged biethienyl molecules on the electrode surface prior to electron transfer

Key Words:

• 3,3′-bridged-2,2′-bithienyls
• UV-spectra
• oxidation potentials
• cyclic voltammetry
• electrode adsorption orientation.