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Tetra[2,3-thienylene]: A Building Block for Single-Molecule Electromechanical Actuators
October 2002
October 2002
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Abstract
Tetra(2,3-thienylene) is a thiophene-fused [8]annulene capable of undergoing redox-induced
dimensional changes. The feasibility of efficiently translating this intrinsic function
into a single polymeric electromechanical actuator is investigated by both experiment
and density functional theory (B3LYP 6-31G[d,p]). A study of tetra(2,3-thienylene)
and its homodimer reveal that redox-induced conformational change is conserved upon
dimerization, a result that implicates similar behavior in the corresponding polymer.
Theoretical predictions yield a maximum redox-induced dimensional change of 5.92%
per repeat unit for the homodimer. Cyclic voltammetry reveals complete reversibility
for the corresponding redox cycle. The latter two facts establish tetra(2,3-thienylene)
as a suitable building block for single-molecule electromechanical actuators.