Analysis of Single Molecule Conductance of Heterogeneous Porphyrin Arrays by Partial Transmission Probabilities. Issue 25 (28th August 2017)

• Record Type: Journal Article
• Authors: Tamaki, Takashi; Ohto, Tatsuhiko; Yamada, Ryo; Tada, Hirokazu; Ogawa, Takuji
• Is Part Of: ChemistrySelect. Volume 2:Issue 25(2017)
• Page Start: 7484
• Page End: 7488
• Publication Date: 2017-08-28
• Subjects: break-junction method -- molecular electronics -- porphyrin -- single-molecule studies -- transmission probability; Chemistry -- Periodicals; 540.5
• DOI: 10.1002/slct.201701015
• Languages: English
• ISSNs: 2365-6549

Abstract

Abstract: Single molecule conductance (SMC) of a series of porphyrin derivatives, whose porphyrin units are connected through a phenylene bridge that have one or two thiolate end groups, was measured by a scanning tunneling microscopic break junction (STM‐BJ) technique. The observed conductance values were analyzed by partial transmission probabilities ( T i ) for the molecular parts using the equation G = G 0 ∏ i N T i . Unique combination of T i was obtained, which indicates the validity of this analysis. By the analysis, the free‐base porphyrin ring interacting with the gold electrode was found to show a greater transmission probability T por‐Au than that of the bridge between thiolate and the gold electrode ( T S‐Au ). Abstract : Single molecular conductance (SMC) of porphryins, which was measured by break junction technique, were analyzed by partial transmission probabilities ( T i ) for the molecular parts. Unique combination of T i was obtained and these values reproduced experimental SMC, which indicate validity of this analysis. Furthermore, free‐base porphyrin found to work as anchoring group and show high transmission probability.