{"_id":"17929","citation":{"ama":"Gunasekaran S, Hernangómez-Pérez D, Davydenko I, Marder S, Evers F, Venkataraman L. Near length-independent conductance in polymethine molecular wires. <i>Nano Letters</i>. 2018;18(10):6387-6391. doi:<a href=\"https://doi.org/10.1021/acs.nanolett.8b02743\">10.1021/acs.nanolett.8b02743</a>","mla":"Gunasekaran, Suman, et al. “Near Length-Independent Conductance in Polymethine Molecular Wires.” <i>Nano Letters</i>, vol. 18, no. 10, American Chemical Society, 2018, pp. 6387–91, doi:<a href=\"https://doi.org/10.1021/acs.nanolett.8b02743\">10.1021/acs.nanolett.8b02743</a>.","apa":"Gunasekaran, S., Hernangómez-Pérez, D., Davydenko, I., Marder, S., Evers, F., &#38; Venkataraman, L. (2018). Near length-independent conductance in polymethine molecular wires. <i>Nano Letters</i>. American Chemical Society. <a href=\"https://doi.org/10.1021/acs.nanolett.8b02743\">https://doi.org/10.1021/acs.nanolett.8b02743</a>","ieee":"S. Gunasekaran, D. Hernangómez-Pérez, I. Davydenko, S. Marder, F. Evers, and L. Venkataraman, “Near length-independent conductance in polymethine molecular wires,” <i>Nano Letters</i>, vol. 18, no. 10. American Chemical Society, pp. 6387–6391, 2018.","ista":"Gunasekaran S, Hernangómez-Pérez D, Davydenko I, Marder S, Evers F, Venkataraman L. 2018. Near length-independent conductance in polymethine molecular wires. Nano Letters. 18(10), 6387–6391.","short":"S. Gunasekaran, D. Hernangómez-Pérez, I. Davydenko, S. Marder, F. Evers, L. Venkataraman, Nano Letters 18 (2018) 6387–6391.","chicago":"Gunasekaran, Suman, Daniel Hernangómez-Pérez, Iryna Davydenko, Seth Marder, Ferdinand Evers, and Latha Venkataraman. “Near Length-Independent Conductance in Polymethine Molecular Wires.” <i>Nano Letters</i>. American Chemical Society, 2018. <a href=\"https://doi.org/10.1021/acs.nanolett.8b02743\">https://doi.org/10.1021/acs.nanolett.8b02743</a>."},"year":"2018","extern":"1","date_updated":"2024-12-11T08:39:06Z","publication":"Nano Letters","date_published":"2018-09-01T00:00:00Z","external_id":{"pmid":["30187756"]},"date_created":"2024-09-09T08:05:20Z","abstract":[{"lang":"eng","text":"Polymethine dyes are linear π-conjugated compounds with an odd number of carbons that display a much greater delocalization in comparison to polyenes that have an even number of carbon atoms in their main chain. Herein, we perform scanning tunneling microscope based break-junction measurements on a series of three cyanine dyes of increasing length. We demonstrate, at the single molecule level, that these short chain polymethine systems exhibit a substantially smaller decay in conductance with length (attenuation factor β = 0.04 Å–1) compared to traditional polyenes (β ≈ 0.2 Å–1). Furthermore, we show that by changing solvent we are able to shift the β value, demonstrating a remarkable negative β value, with conductance increasing with molecular length. First principle calculations provide support for the experimentally observed near-uniform length dependent conductance and further suggest that the variations in β with solvent are due to solvent-induced changes in the alignment of the frontier molecular orbitals relative to the Fermi energy of the leads. A simplified Hückel model suggests that the smaller decay in conductance correlates with the smaller degree of bond order alternation present in polymethine compounds compared to polyenes. These findings may enable the design of molecular wires without a length-dependent decay for efficient electron transport at the nanoscale."}],"pmid":1,"page":"6387-6391","day":"01","type":"journal_article","status":"public","user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","month":"09","OA_type":"closed access","author":[{"last_name":"Gunasekaran","first_name":"Suman","full_name":"Gunasekaran, Suman"},{"full_name":"Hernangómez-Pérez, Daniel","first_name":"Daniel","last_name":"Hernangómez-Pérez"},{"full_name":"Davydenko, Iryna","first_name":"Iryna","last_name":"Davydenko"},{"first_name":"Seth","last_name":"Marder","full_name":"Marder, Seth"},{"full_name":"Evers, Ferdinand","first_name":"Ferdinand","last_name":"Evers"},{"id":"9ebb78a5-cc0d-11ee-8322-fae086a32caf","full_name":"Venkataraman, Latha","last_name":"Venkataraman","first_name":"Latha","orcid":"0000-0002-6957-6089"}],"publication_identifier":{"issn":["1530-6984"],"eissn":["1530-6992"]},"language":[{"iso":"eng"}],"issue":"10","volume":18,"oa_version":"None","article_processing_charge":"No","publisher":"American Chemical Society","intvolume":"        18","title":"Near length-independent conductance in polymethine molecular wires","quality_controlled":"1","article_type":"original","publication_status":"published","doi":"10.1021/acs.nanolett.8b02743","scopus_import":"1"}