E. C. Coelho, V. B. Nascimento, A. Ribeiro
Oct 1, 2015
Citations
0
Influential Citations
6
Citations
Journal
Electrochimica Acta
Abstract
Abstract Two thiophene derivatives named 4”-nitrobenzoyl (thiophene-3′-yl)-1-ethylate ( NTh ) and 3”,5”-dinitrobenzoyl (thiophene-3′-yl)-1-ethylate ( DNTh ) were synthesized and characterized. Both monomers were electrochemically polymerized onto platinum or glassy carbon electrodes by potentiodynamic method in 0.1 mol L −1 TBABF 4 /CH 2 Cl + boron trifluoride diethyl etherate ( BFEE ) (1:1, v/v). These monomers were also successfully polymerized by chemical oxidation using FeCl 3 /CHCl 3 . Spectroscopic and electrochemical properties of the monomers and polymers were investigated. Films of both polymers showed well-defined reversible redox system at the anodic branch (1.0 V vs. Ag/AgCl, KCl (sat.)), attributed to thiophene doping/dedoping process; and another redox process at the cathodic branch ( PNTh ) (or two redox processes for PDNTh ) was attributed to the reduction of the 4-nitrobenzoyl or 3,5-dinitrobenzoyl substituent groups. The THF solutions of monomers and polymers are fluorescent, with emission bands at λ max = 488 nm ( NTh ), 511 nm ( DNTh ), 440 nm ( PNTh ) and 546 nm ( PDNTh ). The monomers are also fluorescent in the solid state.