1
|
Kocábová J, Vavrek F, Nováková Lachmanová Š, Šebera J, Valášek M, Hromadová M. Self-Assembled Monolayers of Molecular Conductors with Terpyridine-Metal Redox Switching Elements: A Combined AFM, STM and Electrochemical Study. MOLECULES (BASEL, SWITZERLAND) 2022; 27:molecules27238320. [PMID: 36500413 PMCID: PMC9738775 DOI: 10.3390/molecules27238320] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/24/2022] [Revised: 11/23/2022] [Accepted: 11/24/2022] [Indexed: 12/02/2022]
Abstract
Self-assembled monolayers (SAMs) of terpyridine-based transition metal (ruthenium and osmium) complexes, anchored to gold substrate via tripodal anchoring groups, have been investigated as possible redox switching elements for molecular electronics. An electrochemical study was complemented by atomic force microscopy (AFM) and scanning tunneling microscopy (STM) methods. STM was used for determination of the SAM conductance values, and computation of the attenuation factor β from tunneling current-distance curves. We have shown that SAMs of Os-tripod molecules contain larger adlayer structures compared with SAMs of Ru-tripod molecules, which are characterized by a large number of almost evenly distributed small islands. Furthermore, upon cyclic voltammetric experimentation, Os-tripod films rearrange to form a smaller number of even larger islands, reminiscent of the Ostwald ripening process. Os-tripod SAMs displayed a higher surface concentration of molecules and lower conductance compared with Ru-tripod SAMs. The attenuation factor of Os-tripod films changed dramatically, upon electrochemical cycling, to a higher value. These observations are in accordance with previously reported electron transfer kinetics studies.
Collapse
Affiliation(s)
- Jana Kocábová
- J. Heyrovský Institute of Physical Chemistry of the Czech Academy of Sciences, Dolejškova 3, 18223 Prague, Czech Republic
| | - František Vavrek
- J. Heyrovský Institute of Physical Chemistry of the Czech Academy of Sciences, Dolejškova 3, 18223 Prague, Czech Republic
| | - Štěpánka Nováková Lachmanová
- J. Heyrovský Institute of Physical Chemistry of the Czech Academy of Sciences, Dolejškova 3, 18223 Prague, Czech Republic
| | - Jakub Šebera
- J. Heyrovský Institute of Physical Chemistry of the Czech Academy of Sciences, Dolejškova 3, 18223 Prague, Czech Republic
| | - Michal Valášek
- Institute of Nanotechnology, Karlsruhe Institute of Technology, P.O. Box 3640, 76021 Karlsruhe, Germany
| | - Magdaléna Hromadová
- J. Heyrovský Institute of Physical Chemistry of the Czech Academy of Sciences, Dolejškova 3, 18223 Prague, Czech Republic
- Correspondence:
| |
Collapse
|
2
|
Godde B, Ferlay S, Kyritsakas N, Hosseini MW, Jouaiti A. Variations around 1D coordination polymers built from the triarylamine scaffold and Hg(II) or Cd(II). Inorganica Chim Acta 2020. [DOI: 10.1016/j.ica.2020.119427] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
|
3
|
Bu D, Xiong Y, Tan YN, Meng M, Low PJ, Kuang DB, Liu CY. Understanding the charge transport properties of redox active metal-organic conjugated wires. Chem Sci 2018; 9:3438-3450. [PMID: 29780473 PMCID: PMC5934749 DOI: 10.1039/c7sc04727d] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2017] [Accepted: 02/16/2018] [Indexed: 11/28/2022] Open
Abstract
For Rh2-organic molecular wires, we found that weaker coupling systems built using longer bridging ligands exhibit better electrical conductance.
Layer-by-layer assembly of the dirhodium complex [Rh2(O2CCH3)4] (Rh2) with linear N,N′-bidentate ligands pyrazine (LS) or 1,2-bis(4-pyridyl)ethene (LL) on a gold substrate has developed two series of redox active molecular wires, (Rh2LS)n@Au and (Rh2LL)n@Au (n = 1–6). By controlling the number of assembling cycles, the molecular wires in the two series vary systematically in length, as characterized by UV-vis spectroscopy, cyclic voltammetry and atomic force microscopy. The current–voltage characteristics recorded by conductive probe atomic force microscopy indicate a mechanistic transition for charge transport from voltage-driven to electrical field-driven in wires with n = 4, irrespective of the nature and length of the wires. Whilst weak length dependence of electrical resistance is observed for both series, (Rh2LL)n@Au wires exhibit smaller distance attenuation factors (β) in both the tunneling (β = 0.044 Å–1) and hopping (β = 0.003 Å–1) regimes, although in (Rh2LS)n@Au the electronic coupling between the adjacent Rh2 centers is stronger. DFT calculations reveal that these wires have a π-conjugated molecular backbone established through π(Rh2)–π(L) orbital interactions, and (Rh2LL)n@Au has a smaller energy gap between the filled π*(Rh2) and the empty π*(L) orbitals. Thus, for (Rh2LL)n@Au, electron hopping across the bridge is facilitated by the decreased metal to ligand charge transfer gap, while in (Rh2LS)n@Au the hopping pathway is disfavored likely due to the increased Coulomb repulsion. On this basis, we propose that the super-exchange tunneling and the underlying incoherent hopping are the dominant charge transport mechanisms for shorter (n ≤ 4) and longer (n > 4) wires, respectively, and the Rh2L subunits in mixed-valence states alternately arranged along the wire serve as the hopping sites.
Collapse
Affiliation(s)
- Donglei Bu
- Department of Chemistry , Jinan University , 601 Huang-Pu Avenue West , Guangzhou 510632 , China .
| | - Yingqi Xiong
- Department of Chemistry , Jinan University , 601 Huang-Pu Avenue West , Guangzhou 510632 , China .
| | - Ying Ning Tan
- Department of Chemistry , Jinan University , 601 Huang-Pu Avenue West , Guangzhou 510632 , China .
| | - Miao Meng
- Department of Chemistry , Jinan University , 601 Huang-Pu Avenue West , Guangzhou 510632 , China .
| | - Paul J Low
- School of Molecular Sciences , University of Western Australia , 35 Stirling Highway , Crawley , 6009 , WA , Australia
| | - Dai-Bin Kuang
- School of Chemistry , SunYat-sen University , Guangzhou 510275 , P. R. China
| | - Chun Y Liu
- Department of Chemistry , Jinan University , 601 Huang-Pu Avenue West , Guangzhou 510632 , China .
| |
Collapse
|
4
|
Maeda H, Sakamoto R, Nishihara H. Interfacial synthesis of electrofunctional coordination nanowires and nanosheets of bis(terpyridine) complexes. Coord Chem Rev 2017. [DOI: 10.1016/j.ccr.2017.02.013] [Citation(s) in RCA: 42] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
|
5
|
Sakamoto R. Bottom-up Creation of Functional Low-Dimensional Materials Based on Metal Complexes. BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 2017. [DOI: 10.1246/bcsj.20160304] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
|
6
|
Maeda H, Sakamoto R, Nishihara H. Electron transport of bis(terpyridine)iron(II) complex wires on a semiconducting electrode. J Electroanal Chem (Lausanne) 2016. [DOI: 10.1016/j.jelechem.2016.04.027] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
|
7
|
Sakamoto R, Wu KH, Matsuoka R, Maeda H, Nishihara H. π-Conjugated bis(terpyridine)metal complex molecular wires. Chem Soc Rev 2016; 44:7698-714. [PMID: 25864838 DOI: 10.1039/c5cs00081e] [Citation(s) in RCA: 116] [Impact Index Per Article: 14.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
Bottom-up approaches have gained significant attention recently for the creation of nano-sized, ordered functional structures and materials. Stepwise coordination techniques, in which ligand molecules and metal sources are reacted alternatively, offer several advantages. Coordination bonds are stable, reversible, and self-assembling, and the resultant metal complex motifs may contain functionalities unique to their own characteristics. This review focuses on metal complex wire systems, specifically the bottom-up fabrication of linear and branched bis(terpyridine)metal complex wires on electrode surfaces. This system possesses distinct and characteristic electronic functionalities, intra-wire redox conduction and excellent long-range electron transport ability. This series of comprehensive studies exploited the customizability of bis(terpyridine)metal complex wires, including examining the influence of building blocks. In addition, simple yet effective electron transfer models were established for redox conduction and long-range electron transport. A fabrication technique for an ultra-long bis(terpyridine)metal complex wire is also described, along with its properties and functionalities.
Collapse
Affiliation(s)
- Ryota Sakamoto
- Department of Chemistry, Graduate School of Science, The University of Tokyo, 7-3-1, Hongo, Bunkyo-ku, Tokyo 113-0033, Japan.
| | - Kuo-Hui Wu
- Department of Chemistry, Graduate School of Science, The University of Tokyo, 7-3-1, Hongo, Bunkyo-ku, Tokyo 113-0033, Japan.
| | - Ryota Matsuoka
- Department of Chemistry, Graduate School of Science, The University of Tokyo, 7-3-1, Hongo, Bunkyo-ku, Tokyo 113-0033, Japan.
| | - Hiroaki Maeda
- Department of Chemistry, Graduate School of Science, The University of Tokyo, 7-3-1, Hongo, Bunkyo-ku, Tokyo 113-0033, Japan.
| | - Hiroshi Nishihara
- Department of Chemistry, Graduate School of Science, The University of Tokyo, 7-3-1, Hongo, Bunkyo-ku, Tokyo 113-0033, Japan.
| |
Collapse
|
8
|
Jeong DC, Song SG, Satheeshkumar C, Lee Y, Kim KS, Song C. Enhanced photoinduced electron transfer by multiwalled carbon nanotubes in self-assembled terpyridine polymer networks. POLYMER 2015. [DOI: 10.1016/j.polymer.2015.05.036] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
|
9
|
Jeong DC, Lee J, Lee Y, Satheeshkumar C, Song C. Enhancement of Photoinduced Electron Transfer in Self-Assembled Polymer Films Using Mixed Metal–Terpyridine Complexes. Macromolecules 2015. [DOI: 10.1021/ma502619a] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Dong-Cheol Jeong
- Department
of Chemistry, Sungkyunkwan University, Suwon, Gyeonggi 440-746, Republic of Korea
| | - Jiyoung Lee
- Department
of Chemistry, Sungkyunkwan University, Suwon, Gyeonggi 440-746, Republic of Korea
| | - Yunmi Lee
- Department
of Chemistry, Kwangwoon University, Seoul 139-701, Republic of Korea
| | | | - Changsik Song
- Department
of Chemistry, Sungkyunkwan University, Suwon, Gyeonggi 440-746, Republic of Korea
| |
Collapse
|
10
|
Maeda H, Sakamoto R, Nishihara H. Surface-Junction Effects on Interfacial Electron Transfer between Bis(terpyridine)iron(II) and Hydrogen-Terminated Silicon(111) Electrode. Chemistry 2014; 20:2761-4. [DOI: 10.1002/chem.201304588] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2013] [Revised: 12/24/2013] [Indexed: 11/07/2022]
|