Abstract
To unveil the influence of metal coordination on charge transport and length-dependent conductance attenuation in π-conjugated organic molecules, trans-Ru(dppe)2 (dppe = 1,2-bis(diphenylphosphino)ethane) was implanted into oligoynyl chains with various number of ethynyl groups to construct Au–molecule–Au junctions using methylthiol (−SMe) as anchoring groups. The single-molecule conductance measured by I(s) method gave high and low values of conductance. A direct comparison of the conductance indicates that implanting trans-Ru(dppe)2 moiety into π-conjugated oligoynyl chains results in 2.6- to 5.8-fold enhancement of the conductance although the molecular length is increased by ca. 0.25 nm as a result of Ru insertion. More importantly, implanting trans-Ru(dppe)2 moiety into π-conjugated oligoynyl chains alleviates dramatically length-dependent conductance attenuation in view of the much smaller conductance decay constants for ruthenium(II)-implanted molecules (2.6 nm–1 for high value and 2.5 nm–1 for low ...
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