Polymethine and polyene molecular wires of sufficient length host effects of topology - solitons. In this work, we perform STM-based break-junction measurements on a series of relatively short wires with increasing length N. We demonstrate that chains with N-odd exhibit a substantially smaller decay in conductance with length (attenuation factor β = 0.04 Å–1) compared to N-even (β ≈ 0.2 Å–1). Furthermore, by changing solvent we can shift β, demonstrating a remarkable negative β value. Our findings may enable the design of molecular wires without a length-dependent decay for efficient electron transport at the nanoscale.
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